1993 FORD MONDEO tire type

Exhaust system
MStart the engine. With your assistant
holding a rag over the tailpipe, check the
entire system for leaks. Repair or renew
leaking sections.
Jack up the front and rear of the vehicle,
and securely support it on axle stands.
Position the stands clear of the suspension
assemblies. Ensure that the wheels are
clear of the ground and that the steering
can be turned from lock to lock.
Steering mechanism
MHave your assistant turn the steering from
lock to lock. Check that the steering turns
smoothly, and that no part of the steering
mechanism, including a wheel or tyre, fouls
any brake hose or pipe or any part of the body
structure.
MExamine the steering rack rubber gaiters
for damage or insecurity of the retaining clips.
If power steering is fitted, check for signs of
damage or leakage of the fluid hoses, pipes or
connections. Also check for excessive
stiffness or binding of the steering, a missing
split pin or locking device, or severe corrosion
of the body structure within 30 cm of any
steering component attachment point.
Front and rear suspension and
wheel bearings
MStarting at the front right-hand side, grasp
the roadwheel at the 3 o’clock and 9 o’clock
positions and shake it vigorously. Check for
free play or insecurity at the wheel bearings,
suspension balljoints, or suspension mount-
ings, pivots and attachments.
MNow grasp the wheel at the 12 o’clock and
6 o’clock positions and repeat the previous
inspection. Spin the wheel, and check for
roughness or tightness of the front wheel
bearing.
MIf excess free play is suspected at a
component pivot point, this can be confirmed
by using a large screwdriver or similar tool and
levering between the mounting and the
component attachment. This will confirm
whether the wear is in the pivot bush, its
retaining bolt, or in the mounting itself (the bolt
holes can often become elongated).
MCarry out all the above checks at the other
front wheel, and then at both rear wheels.
Springs and shock absorbers
MExamine the suspension struts (when
applicable) for serious fluid leakage, corrosion,
or damage to the casing. Also check the
security of the mounting points.
MIf coil springs are fitted, check that the
spring ends locate in their seats, and that the
spring is not corroded, cracked or broken.
MIf leaf springs are fitted, check that all
leaves are intact, that the axle is securely
attached to each spring, and that there is no
deterioration of the spring eye mountings,
bushes, and shackles.MThe same general checks apply to vehicles
fitted with other suspension types, such as
torsion bars, hydraulic displacer units, etc.
Ensure that all mountings and attachments are
secure, that there are no signs of excessive
wear, corrosion or damage, and (on hydraulic
types) that there are no fluid leaks or damaged
pipes.
MInspect the shock absorbers for signs of
serious fluid leakage. Check for wear of the
mounting bushes or attachments, or damage
to the body of the unit.
Driveshafts
(fwd vehicles only)
MRotate each front wheel in turn and inspect
the constant velocity joint gaiters for splits or
damage. Also check that each driveshaft is
straight and undamaged.
Braking system
MIf possible without dismantling, check
brake pad wear and disc condition. Ensure
that the friction lining material has not worn
excessively, (A) and that the discs are not
fractured, pitted, scored or badly worn (B).
MExamine all the rigid brake pipes
underneath the vehicle, and the flexible
hose(s) at the rear. Look for corrosion, chafing
or insecurity of the pipes, and for signs of
bulging under pressure, chafing, splits or
deterioration of the flexible hoses.
MLook for signs of fluid leaks at the brake
calipers or on the brake backplates. Repair or
renew leaking components.
MSlowly spin each wheel, while your
assistant depresses and releases the
footbrake. Ensure that each brake is operating
and does not bind when the pedal is released.
3Checks carried out
WITH THE VEHICLE RAISED
AND THE WHEELS FREE TO
TURN
0•9MOT Test Checks
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0•10
MExamine the handbrake mechanism,
checking for frayed or broken cables,
excessive corrosion, or wear or insecurity of
the linkage. Check that the mechanism works
on each relevant wheel, and releases fully,
without binding.
MIt is not possible to test brake efficiency
without special equipment, but a road test
can be carried out later to check that the
vehicle pulls up in a straight line.
Fuel and exhaust systems
MInspect the fuel tank (including the filler
cap), fuel pipes, hoses and unions. All
components must be secure and free from
leaks.
MExamine the exhaust system over its entire
length, checking for any damaged, broken or
missing mountings, security of the retaining
clamps and rust or corrosion.
Wheels and tyres
MExamine the sidewalls and tread area of
each tyre in turn. Check for cuts, tears, lumps,
bulges, separation of the tread, and exposure
of the ply or cord due to wear or damage.
Check that the tyre bead is correctly seated
on the wheel rim, that the valve is sound andproperly seated, and that the wheel is not
distorted or damaged.
MCheck that the tyres are of the correct size
for the vehicle, that they are of the same size
and type on each axle, and that the pressures
are correct.
MCheck the tyre tread depth. The legal
minimum at the time of writing is 1.6 mm over
at least three-quarters of the tread width.
Abnormal tread wear may indicate incorrect
front wheel alignment.
Body corrosion
MCheck the condition of the entire vehicle
structure for signs of corrosion in load-
bearing areas. (These include chassis box
sections, side sills, cross-members, pillars,
and all suspension, steering, braking system
and seat belt mountings and anchorages.)
Any corrosion which has seriously reduced
the thickness of a load-bearing area is likely to
cause the vehicle to fail. In this case
professional repairs are likely to be needed.
MDamage or corrosion which causes sharp
or otherwise dangerous edges to be exposed
will also cause the vehicle to fail.
Petrol models
MHave the engine at normal operating
temperature, and make sure that it is in good
tune (ignition system in good order, air filter
element clean, etc).
MBefore any measurements are carried out,
raise the engine speed to around 2500 rpm,
and hold it at this speed for 20 seconds. Allow
the engine speed to return to idle, and watchfor smoke emissions from the exhaust
tailpipe. If the idle speed is obviously much
too high, or if dense blue or clearly-visible
black smoke comes from the tailpipe for more
than 5 seconds, the vehicle will fail. As a rule
of thumb, blue smoke signifies oil being burnt
(engine wear) while black smoke signifies
unburnt fuel (dirty air cleaner element, or other
carburettor or fuel system fault).
MAn exhaust gas analyser capable of
measuring carbon monoxide (CO) and
hydrocarbons (HC) is now needed. If such an
instrument cannot be hired or borrowed, a
local garage may agree to perform the check
for a small fee.
CO emissions (mixture)
MAt the time or writing, the maximum CO
level at idle is 3.5% for vehicles first used after
August 1986 and 4.5% for older vehicles.
From January 1996 a much tighter limit
(around 0.5%) applies to catalyst-equipped
vehicles first used from August 1992. If the
CO level cannot be reduced far enough to
pass the test (and the fuel and ignition
systems are otherwise in good condition) then
the carburettor is badly worn, or there is some
problem in the fuel injection system or
catalytic converter (as applicable).
HC emissionsMWith the CO emissions within limits, HC
emissions must be no more than 1200 ppm
(parts per million). If the vehicle fails this test
at idle, it can be re-tested at around 2000
rpm; if the HC level is then 1200 ppm or less,
this counts as a pass.
MExcessive HC emissions can be caused by
oil being burnt, but they are more likely to be
due to unburnt fuel.
Diesel models
MThe only emission test applicable to Diesel
engines is the measuring of exhaust smoke
density. The test involves accelerating the
engine several times to its maximum
unloaded speed.
Note: It is of the utmost importance that the
engine timing belt is in good condition before
the test is carried out.
M
Excessive smoke can be caused by a dirty
air cleaner element. Otherwise, professional
advice may be needed to find the cause.
4Checks carried out on
YOUR VEHICLE’S EXHAUST
EMISSION SYSTEM
MOT Test Checks
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cylinder head cover; unscrew it to add oil (see
illustration). When topping-up, use only the
correct grade and type of oil, as given in the
Specifications Section of this Chapter; use a
funnel if necessary to prevent spills. It takes
approximately 0.5 to 1.0 litre of oil to raise the
level from the dipstick’s minimum level notch
to its maximum level notch. After adding the
oil, refit the filler cap hand-tight. Start the
engine, and allow it to idle while the oil is
redistributed around the engine - while you
are waiting, look carefully for any oil leaks,
particularly around the oil filter or drain plug.
Stop the engine; check the oil level again,
after the oil has had enough time to drain from
the upper block and cylinder head galleries.
7Checking the oil level is an important
preventive maintenance step. A continually-
dropping oil level indicates oil leakage through
damaged seals and from loose connections,
or oil consumption past worn piston rings or
valve guides. If the oil looks milky in colour, or
has water droplets in it, the cylinder head
gasket may be blown - the engine’s
compression pressure should be checked
immediately (see Chapter 2A). The condition
of the oil should also be checked. Each time
you check the oil level, slide your thumb and
index finger up the dipstick before wiping off
the oil. If you see small dirt or metal particles
clinging to the dipstick, the oil should be
changed (Section 15).
Coolant
Warning: Do not allow antifreeze
to come in contact with your skin
or painted surfaces of the
vehicle. Flush contaminated areas
immediately with plenty of water. Don’t
store new coolant, or leave old coolant
lying around, where it’s accessible to
children or pets - they’re attracted by its
sweet smell. Ingestion of even a small
amount of coolant can be fatal! Wipe up
garage-floor and drip-pan spills
immediately. Keep antifreeze containers
covered, and repair cooling system leaks
as soon as they’re noticed.8All vehicles covered by this manual are
equipped with a sealed, pressurised cooling
system. A translucent plastic expansion tank,
located on the right-hand side of the engine
compartment, is connected by a hose to the
thermostat housing. As the coolant heats up
during engine operation, surplus coolant
passes through the connecting hose into the
expansion tank; a connection to the radiator
bottom hose union allows coolant to circulate
through the tank and back to the water pump,
thus purging any air from the system. As the
engine cools, the coolant is automatically
drawn back into the cooling system’s main
components, to maintain the correct level.
9While the coolant level must be checked
regularly, remember therefore that it will vary
with the temperature of the engine. When the
engine is cold, the coolant level should be
between the “MAX” and “MIN” level lines on
the tank, but once the engine has warmed up,
the level may rise to above the “MAX” level
line.
10For an accurate check of the coolant
level, the engine must be cold. The level must
be between the “MAX” and “MIN” level lines
on the tank (see illustration). If it is below the
“MIN” level line, the coolant must be topped-
up as follows.
11First prepare a sufficient quantity of
coolant mixture, using clean, soft water and
antifreeze of the recommended type, in the
specified mixture ratio. If you are using
antifreeze to Ford’s specification or equivalent
(see the note at the beginning of Section 2 of
this Chapter), mix equal quantities of water
and antifreeze to produce the 50/50 mixture
ratio specified when topping-up; if using any
other type of antifreeze, follow its
manufacturer’s instructions to achieve the
correct ratio. If only a small amount of coolant
is required to bring the system up to the
proper level, plain water can be used, but
repeatedly doing this will dilute the
antifreeze/water solution in the system,
reducing the protection it should provide
against freezing and corrosion. To maintainthe specified antifreeze/water ratio, it is
essential to top-up the coolant level with the
correct mixture, as described here. Use only
ethylene/glycol type antifreeze, and do not
use supplementary inhibitors or additives.
Warning: Never remove the
expansion tank filler cap when
the engine is running, or has just
been switched off, as the cooling system
will be hot, and the consequent escaping
steam and scalding coolant could cause
serious injury.
12If topping-up is necessary, wait until the
system has cooled completely (or at least 10
minutes after switching off the engine, if lack
of time means it is absolutely necessary to
top-up while the engine may still be warm).
Wrap a thick cloth around the expansion tank
filler cap, and unscrew it one full turn. If any
hissing is heard as steam escapes, wait until
the hissing ceases, indicating that pressure is
released, then slowly unscrew the filler cap
until it can be removed. If more hissing
sounds are heard, wait until they have
stopped before unscrewing the filler cap
completely. At all times, keep your face,
hands and other exposed skin well away from
the filler opening.
13When the filler cap has been removed,
add coolant to bring the level up to the “MAX”
level line (see illustration). Refit the cap,
tightening it securely.
14With this type of cooling system, the
addition of coolant should only be necessary at
very infrequent intervals. If topping-up is
regularly required, or if the coolant level drops
within a short time after replenishment, there
may be a leak in the system. Inspect the
radiator, hoses, expansion tank filler cap,
radiator drain plug and water pump. If no leak is
evident, have the filler cap and the entire
system pressure-tested by your dealer or
suitably-equipped garage; this will usually show
up a small leak not otherwise visible. If
significant leakage is found at any time, use an
antifreeze hydrometer to check the con-
centration of antifreeze remaining in the coolant.
1•7
13.13 Remove the cap to add coolant only
when the engine is cold - top-up to the
“MAX” level line using the specified
coolant mixture3.6 The yellow/black oil filler cap is
screwed into the cylinder head cover.
Always make sure the area around the
opening is clean before unscrewing the
cap, to prevent dirt from contaminating the
engine3.10 The cooling system expansion tank is
located on the right-hand side of the
engine compartment. The coolant level
must be between the tank “MAX” and
“MIN” level lines (arrowed) when the
engine is cold
Weekly checks
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5Check all fluid reservoirs, filler caps, drain
plugs and fittings etc, looking for any signs of
leakage of oil, transmission and/or brake
hydraulic fluid, coolant and power steering
fluid. If the vehicle is regularly parked in the
same place, close inspection of the ground
underneath it will soon show any leaks; ignore
the puddle of water which will be left if the air
conditioning system is in use. As soon as a
leak is detected, its source must be traced
and rectified. Where oil has been leaking for
some time, it is usually necessary to use a
steam cleaner, pressure washer or similar, to
clean away the accumulated dirt, so that the
exact source of the leak can be identified.
Vacuum hoses
6It’s quite common for vacuum hoses,
especially those in the emissions system, to
be colour-coded, or to be identified by
coloured stripes moulded into them. Various
systems require hoses with different wall
thicknesses, collapse resistance and
temperature resistance. When renewing
hoses, be sure the new ones are made of the
same material.
7Often the only effective way to check a
hose is to remove it completely from the
vehicle. If more than one hose is removed, be
sure to label the hoses and fittings to ensure
correct installation.
8When checking vacuum hoses, be sure to
include any plastic T-fittings in the check.
Inspect the fittings for cracks, and check the
hose where it fits over the fitting for distortion,
which could cause leakage.
9A small piece of vacuum hose (quarter-inch
inside diameter) can be used as a
stethoscope to detect vacuum leaks. Hold
one end of the hose to your ear, and probe
around vacuum hoses and fittings, listening
for the “hissing” sound characteristic of a
vacuum leak.
Warning: When probing with the
vacuum hose stethoscope, be
very careful not to come into
contact with moving engine
components such as the auxiliary
drivebelt, radiator electric cooling fan, etc.
Fuel hoses
Warning: There are certain
precautions which must be taken
when inspecting or servicing fuel
system components. Work in a well-
ventilated area, and do not allow open
flames (cigarettes, appliance pilot lights,
etc.) or bare light bulbs near the work
area. Mop up any spills immediately, and
do not store fuel-soaked rags where they
could ignite.
10Check all fuel hoses for deterioration and
chafing. Check especially for cracks in areas
where the hose bends, and also just before
fittings, such as where a hose attaches to the
fuel filter.
11High-quality fuel line, usually identified by
the word “Fluoroelastomer” printed on thehose, should be used for fuel line renewal.
Never, under any circumstances, use
unreinforced vacuum line, clear plastic tubing
or water hose for fuel lines.
12Spring-type clamps are commonly used
on fuel lines. These clamps often lose their
tension over a period of time, and can be
“sprung” during removal. Replace all
spring-type clamps with screw clamps
whenever a hose is replaced.
Metal lines
13Sections of metal piping are often used
for fuel line between the fuel filter and the
engine. Check carefully to be sure the piping
has not been bent or crimped, and that cracks
have not started in the line.
14If a section of metal fuel line must be
renewed, only seamless steel piping should
be used, since copper and aluminium piping
don’t have the strength necessary to
withstand normal engine vibration.
15Check the metal brake lines where they
enter the master cylinder and ABS hydraulic
unit (if used) for cracks in the lines or loose
fittings. Any sign of brake fluid leakage calls
for an immediate and thorough inspection of
the brake system.
1With the vehicle parked on level ground,
apply the handbrake firmly and open the
bonnet. Using an inspection light or a small
electric torch, check all visible wiring within
and beneath the engine compartment.
2What you are looking for is wiring that is
obviously damaged by chafing against sharp
edges, or against moving suspension/
transmission components and/or the auxiliary
drivebelt, by being trapped or crushed
between carelessly-refitted components, or
melted by being forced into contact with the
hot engine castings, coolant pipes, etc. In
almost all cases, damage of this sort is
caused in the first instance by incorrect
routing on reassembly after previous work has
been carried out.
3Depending on the extent of the problem,
damaged wiring may be repaired by rejoining
the break or splicing-in a new length of wire,
using solder to ensure a good connection,
and remaking the insulation with adhesive
insulating tape or heat-shrink tubing, as
appropriate. If the damage is extensive, given
the implications for the vehicle’s future
reliability, the best long-term answer may well
be to renew that entire section of the loom,
however expensive this may appear.
4When the actual damage has been
repaired, ensure that the wiring loom is re-
routed correctly, so that it is clear of other
components, and not stretched or kinked, and
is secured out of harm’s way using the plastic
clips, guides and ties provided.
5Check all electrical connectors, ensuringthat they are clean, securely fastened, and
that each is locked by its plastic tabs or wire
clip, as appropriate. If any connector shows
external signs of corrosion (accumulations of
white or green deposits, or streaks of “rust”),
or if any is thought to be dirty, it must be
unplugged and cleaned using electrical
contact cleaner. If the connector pins are
severely corroded, the connector must be
renewed; note that this may mean the renewal
of that entire section of the loom - see your
local Ford dealer for details.
6If the cleaner completely removes the
corrosion to leave the connector in a
satisfactory condition, it would be wise to
pack the connector with a suitable material
which will exclude dirt and moisture,
preventing the corrosion from occurring
again; a Ford dealer may be able to
recommend a suitable product.
7Check the condition of the battery
connections - remake the connections or
renew the leads if a fault is found (see Chap-
ter 5). Use the same techniques to ensure that
all earth points in the engine compartment
provide good electrical contact through clean,
metal-to-metal joints, and that all are securely
fastened. (In addition to the earth connection
at the engine lifting eye, and that from the
transmission to the body/battery, there are
one or two earth points behind each headlight
assembly, and one below the power steering
fluid reservoir.)
8Refer to Section 31 for details of spark plug
(HT) lead checks.
Warning: The air conditioning
system is under high pressure.
Do not loosen any fittings or
remove any components until
after the system has been discharged. Air
conditioning refrigerant must be properly
discharged into an approved type of
container, at a dealer service department
or an automotive air conditioning repair
facility capable of handling R134a
refrigerant. Always wear eye protection
when disconnecting air conditioning
system fittings.
1The following maintenance checks should
be performed on a regular basis, to ensure
that the air conditioner continues to operate at
peak efficiency:
(a) Check the auxiliary drivebelt. If it’s worn
or deteriorated, renew it (see Section 11).
(b) Check the system hoses. Look for cracks,
bubbles, hard spots and deterioration.
Inspect the hoses and all fittings for oil
bubbles and seepage. If there’s any
evidence of wear, damage or leaks, renew
the hose(s).
(c) Inspect the condenser fins for leaves,
insects and other debris. Use a “fin
14 Air conditioning system
check
13 Engine compartment wiring
check
1•15
1
Every 10 000 miles
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are correctly secured, and that the radiator
drain plug is securely tightened. Refit the
radiator undershield, noting that it is located
by three clips at its front edge; tighten the
retaining screws securely (see illustration). If
it was raised, lower the vehicle to the ground.
12Prepare a sufficient quantity of the
specified coolant mixture (see below); allow
for a surplus, so as to have a reserve supply
for topping-up.
13Slowly fill the system through the
expansion tank; since the tank is the highest
point in the system, all the air in the system
should be displaced into the tank by the rising
liquid. Slow pouring reduces the possibility of
air being trapped and forming air-locks.
14Continue filling until the coolant level
reaches the expansion tank “MAX” level line,
then cover the filler opening to prevent
coolant splashing out.
15Start the engine and run it at idle speed,
until it has warmed-up to normal operating
temperature and the radiator electric cooling
fan has cut in; watch the temperature gauge
to check for signs of overheating. If the level in
the expansion tank drops significantly, top-up
to the “MAX” level line, to minimise the
amount of air circulating in the system.
16Stop the engine, allow it to cool down
completely(overnight, if possible), then
uncover the expansion tank filler opening and
top-up the tank to the “MAX” level line. Refit
the filler cap, tightening it securely, and washoff any spilt coolant from the engine
compartment and bodywork.
17After refilling, always check carefully all
components of the system (but especially any
unions disturbed during draining and flushing)
for signs of coolant leaks. Fresh antifreeze has
a searching action, which will rapidly expose
any weak points in the system.
18 Note:If, after draining and refilling the
system, symptoms of overheating are found
which did not occur previously, then the fault
is almost certainly due to trapped air at some
point in the system, causing an air-lock and
restricting the flow of coolant; usually, the air
is trapped because the system was refilled too
quickly. In some cases, air-locks can be
released by tapping or squeezing the various
hoses. If the problem persists, stop the engine
and allow it to cool down completely, before
unscrewing the expansion tank filler cap or
disconnecting hoses to bleed out the trapped
air.
Antifreeze mixture
19If the antifreeze used is not to Ford’s
specification, it should always be renewed at
the suggested intervals. This is necessary not
only to maintain the antifreeze properties, but
also to prevent the corrosion which would
otherwise occur as the corrosion inhibitors
become progressively less effective. Always
use an ethylene glycol-based antifreeze which
is suitable for use in mixed-metal cooling
systems.
20If the antifreeze used is to Ford’s
specification, the levels of protection it affords
are indicated in the Specifications Section of
this Chapter. To give the recommended
standardmixture ratio for this antifreeze, 40%
(by volume) of antifreeze must be mixed with
60% of clean, soft water; if you are using any
other type of antifreeze, follow its
manufacturer’s instructions to achieve the
correct ratio. It is best to make up slightly
more than the system’s specified capacity, so
that a supply is available for subsequent
topping-up.
21Before adding antifreeze, the cooling
system should be completely drained,
preferably flushed, and all hoses checked forcondition and security. As noted earlier, fresh
antifreeze will rapidly find any weaknesses in
the system.
22After filling with antifreeze, a label should
be attached to the expansion tank, stating the
type and concentration of antifreeze used,
and the date installed. Any subsequent
topping-up should be made with the same
type and concentration of antifreeze. If
topping-up using antifreeze to Ford’s
specification, note that a 50/50 mixture is
permissible, purely for convenience.
23Do not use engine antifreeze in the
windscreen/tailgate washer system, as it will
damage the vehicle’s paintwork. A screen
wash additive should be added to the washer
system in its maker’s recommended
quantities.
General cooling system checks
24The engine should be cold for the cooling
system checks, so perform the following
procedure before driving the vehicle, or after it
has been shut off for at least three hours.
25Remove the expansion tank filler cap (see
Section 3), and clean it thoroughly inside and
out with a rag. Also clean the filler neck on the
expansion tank. The presence of rust or
corrosion in the filler neck indicates that the
coolant should be changed. The coolant
inside the expansion tank should be relatively
clean and transparent. If it is rust- coloured,
drain and flush the system, and refill with a
fresh coolant mixture.
26Carefully check the radiator hoses and
heater hoses along their entire length; renew
any hose which is cracked, swollen or
deteriorated (see Section 12).
27Inspect all other cooling system
components (joint faces, etc.) for leaks. A leak
in the cooling system will usually show up as
white- or rust-coloured deposits on the area
adjoining the leak. Where any problems of this
nature are found on system components,
renew the component or gasket with
reference to Chapter 3.
28Clean the front of the radiator with a soft
brush to remove all insects, leaves, etc,
embedded in the radiator fins. Be careful not
to damage the radiator fins, or cut your fingers
on them.
1•22
28.11 Ensure radiator undershield is
located securely in three clips at front
edge (arrowed) when refitting
Every 30 000 miles
Every 30 000 miles or 3 years
1The air filter element is located in the air
cleaner assembly on the left-hand side of the
engine compartment. Release the clips, and
lift the air cleaner cover (see illustrations). If
the additional working clearance is required,
unclip the cover from the air mass meter, and
withdraw it completely.
2Lift out the element, and wipe out thehousing (see illustration). Check that no
foreign matter is visible, either in the air intake
or in the air mass meter.
3If carrying out a routine service, the element
must be renewed regardless of its apparent
condition; note that the small foam filter in the
rear right-hand corner of the air cleaner
housing must be cleaned whenever the air
filter element is renewed (see Section 30).
4If you are checking the element for any
other reason, inspect its lower surface; if it is
oily or very dirty, renew the element. If it is
only moderately dusty, it can be re-used byblowing it clean from the upper to the lower
surface with compressed air. Because it is a
pleated-paper type filter, it cannot be washed
or re-oiled. If it cannot be cleaned
satisfactorily with compressed air, discard
and renew it.
Warning: Wear eye protection
when using compressed air!
Caution: Never drive the vehicle
with the air cleaner filter element
removed. Excessive engine wear could
result, and backfiring could even cause a
fire under the bonnet.
29 Air filter element renewal
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check the cylinder head threads and tapered
sealing surfaces for signs of wear, excessive
corrosion or damage; if any of these
conditions is found, seek the advice of a Ford
dealer as to the best method of repair.
7As each plug is removed, examine it as
follows - this will give a good indication of the
condition of the engine. If the insulator nose of
the spark plug is clean and white, with no
deposits, this is indicative of a weak mixture.
8If the tip and insulator nose are covered
with hard black-looking deposits, then this is
indicative that the mixture is too rich. Should
the plug be black and oily, then it is likely that
the engine is fairly worn, as well as the mixture
being too rich.
9If the insulator nose is covered with light tan
to greyish-brown deposits, then the mixture is
correct, and it is likely that the engine is in
good condition.
10If you are renewing the spark plugs,
purchase the new plugs, then check each of
them first for faults such as cracked insulators
or damaged threads. Note also that,
whenever the spark plugs are renewed as a
routine service operation, the spark plug (HT)
leads should be checked as described below.
11The spark plug electrode gap is of
considerable importance as, if it is too large or
too small, the size of the spark and its
efficiency will be seriously impaired. The gap
should be set to the value given in the
Specifications Section of this Chapter. New
plugs will not necessarily be set to the correct
gap, so they should always be checked
before fitting.
12Special spark plug electrode gap
adjusting tools are available from most motor
accessory shops (see illustration).
13To set the electrode gap, measure the
gap with a feeler gauge, and then bend open,
or closed, the outer plug electrode until the
correct gap is achieved (see illustration). The
centre electrode should never be bent, as this
may crack the insulation and cause plug
failure, if nothing worse. If the outer electrode
is not exactly over the centre electrode, bend
it gently to align them.14Before fitting the spark plugs, check that
the threaded connector
sleeves at the top of the plugs are tight, and
that the plug exterior surfaces and threads are
clean. Brown staining on the porcelain,
immediately above the metal body, is quite
normal, and does not necessarily indicate a
leak between the body and insulator.
15On installing the spark plugs, first check
that the cylinder head thread and sealing
surface are as clean as possible; use a clean
rag wrapped around a paintbrush to wipe
clean the sealing surface. Apply a smear of
copper-based grease or anti-seize compound
to the threads of each plug, and screw them
in by hand where possible. Take extra care to
enter the plug threads correctly, as the
cylinder head is of aluminium alloy - it’s often
difficult to insert spark plugs into their holes
without cross-threading them.
16When each spark plug is started correctly
on its threads, screw it down until it just seats
lightly, then tighten it to the specified torquewrench setting (see illustration). If a torque
wrench is not available - and this is one case
where the use of a torque wrench is strongly
recommended - tighten each spark plug
through no more than1/16 of a turn. Do not
exceed the specified torque setting, and
NEVERovertighten these spark plugs - their
tapered seats mean they are almost
impossible to remove if abused.
17Reconnect the spark plug (HT) leads in
their correct order, using a twisting motion on
the boot until it is firmly seated on the end of
the spark plug and on the cylinder head cover.
Spark plug (HT) lead check
18The spark plug (HT) leads should be
checked whenever the plugs themselves are
renewed. Start by making a visual check of
the leads while the engine is running. In a
darkened garage (make sure there is
ventilation) start the engine and observe each
lead. Be careful not to come into contact with
any moving engine parts. If there is a break in
the lead, you will see arcing or a small spark
at the damaged area.
19The spark plug (HT) leads should be
inspected one at a time, to prevent mixing up
the firing order, which is essential for proper
engine operation. Each original lead should be
numbered to identify its cylinder. If the
number is illegible, a piece of tape can be
marked with the correct number, and
wrapped around the lead (the leads should be
numbered 1 to 4, with No 1 lead nearest the
timing belt end of the engine). The lead can
then be disconnected.
20Check inside the boot for corrosion, which
will look like a white crusty powder. Clean this
off as much as possible; if it is excessive, or if
cleaning leaves the metal connector too badly
corroded to be fit for further use, the lead
must be renewed. Push the lead and boot
back onto the end of the spark plug. The boot
should fit tightly onto the end of the plug - if it
doesn’t, remove the lead and use pliers
carefully to crimp the metal connector inside
the boot until the fit is snug.
21Using a clean rag, wipe the entire length of
1•25
1
Every 30 000 miles
31.12 Spark plug manufacturers
recommend using a wire-type gauge when
checking the gap - if the wire does not
slide between the electrodes with a slight
drag, adjustment is required31.13 To change the gap, bend the outer
electrode only, as indicated by the arrows,
and be very careful not to crack or chip the
porcelain insulator surrounding the centre
electrode31.16 Spark plugs have tapered seats - do
not overtighten them on refitting, or you
will not be able to get them out again
without risking damage to the plugs and
cylinder head
To avoid the possibility of cross-
threading a spark plug, fit a short piece
of rubber hose over the end of the
plug. The flexible hose acts as a
universal joint, to help align the plug
with the plug hole. Should the plug
begin to cross-thread, the hose will slip
on the spark plug, preventing thread
damage.
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15Measure the piston diameter at right-
angles to the gudgeon pin axis, just above the
bottom of the skirt; again, note the results
(see illustration).
16If it is wished to obtain the piston-to-bore
clearance, measure the bore and piston skirt
as described above, and subtract the skirt
diameter from the bore measurement. If the
precision measuring tools shown are not
available, the condition of the pistons and
bores can be assessed, though not quite as
accurately, by using feeler gauges as follows.
Select a feeler gauge of thickness equal to the
specified piston-to-bore clearance, and slip it
into the cylinder along with the matching
piston. The piston must be positioned exactly
as it normally would be. The feeler gauge
must be between the piston and cylinder on
one of the thrust faces (at right-angles to the
gudgeon pin bore). The piston should slip
through the cylinder (with the feeler gauge in
place) with moderate pressure; if it falls
through or slides through easily, the clearance
is excessive, and a new piston will be
required. If the piston binds at the lower end
of the cylinder, and is loose toward the top,
the cylinder is tapered. If tight spots are
encountered as the piston/feeler gauge is
rotated in the cylinder, the cylinder is out-of-
round (oval).
17Repeat these procedures for the
remaining pistons and cylinder bores.
18Compare the results with the
Specifications at the beginning of this
Chapter; if any measurement is beyond the
dimensions specified for that class (check the
piston crown marking to establish the class of
piston fitted), or if any bore measurement is
significantly different from the others
(indicating that the bore is tapered or oval),
the piston or bore is excessively-worn.
19Worn pistons must be renewed; at the
time of writing, pistons are available as Ford
replacement parts only as part of the
complete piston/connecting rod assembly.
See a Ford dealer or engine reconditioning
specialist for advice.
20If any of the cylinder bores are badlyscuffed or scored, or if they are excessively-
worn, out-of-round or tapered, the usual
course of action would be to have the cylinder
block/crankcase rebored, and to fit new,
oversized, pistons on reassembly. See a Ford
dealer or engine reconditioning specialist for
advice.
21If the bores are in reasonably good
condition and not excessively-worn, then it
may only be necessary to renew the piston
rings.
22If this is the case (and if new rings can be
found), the bores should be honed, to allow
the new rings to bed in correctly and provide
the best possible seal; before honing the
bores, refit the main bearing caps (without the
bearing shells), and tighten the bolts to the
specified torque wrench setting. Note:If you
don’t have the tools, or don’t want to tackle
the honing operation, most engine
reconditioning specialists will do it for a
reasonable fee.
23Two types of cylinder hones are
commonly available - the flex hone or “bottle-
brush” type, and the more traditional
surfacing hone with spring-loaded stones.
Both will do the job and are used with a
power drill, but for the less-experienced
mechanic, the “bottle-brush” hone will
probably be easier to use. You will also need
some paraffin or honing oil, and rags.
Proceed as follows:
(a) Mount the hone in the drill, compress the
stones, and slip it into the first bore (see
illustration). Be sure to wear safety
goggles or a face shield!
(b) Lubricate the bore with plenty of honing
oil, switch on the drill, and move the hone
up and down the bore, at a pace that will
produce a fine cross-hatch pattern on the
cylinder walls. Ideally, the cross-hatch
lines should intersect at approximately a
60° angle (see illustration). Be sure to
use plenty of lubricant, and don’t take off
any more material than is absolutely
necessary to produce the desired finish.
Note:Piston ring manufacturers may
specify a different crosshatch angle - readand follow any instructions included with
the new rings.
(c) Don’t withdraw the hone from the bore
while it’s running. Instead, switch off the
drill, and continue moving the hone up
and down the bore until it comes to a
complete stop, then compress the stones
and withdraw the hone. If you’re using a
“bottle-brush” hone, switch off the drill,
then turn the chuck in the normal
direction of rotation while withdrawing the
hone from the bore.
(d) Wipe the oil out of the bore, and repeat
the procedure for the remaining cylinders.
(e) When all the cylinder bores are honed,
chamfer the top edges of the bores with a
small file, so the rings won’t catch when
the pistons are installed. Be very careful
not to nick the cylinder walls with the end
of the file.
(f) The entire cylinder block/crankcase must
be washed very thoroughly with warm,
soapy water, to remove all traces of the
abrasive grit produced during the honing
operation. Note:The bores can be
considered clean when a lint-free white
cloth - dampened with clean engine oil -
used to wipe them out doesn’t pick up
any more honing residue, which will show
up as grey areas on the cloth. Be sure to
run a brush through all oil holes and
galleries, and flush them with running
water.
(g) When the cylinder block/crankcase is
completely clean, rinse it thoroughly and
dry it, then lightly oil all exposed
machined surfaces, to prevent rusting.
24The cylinder block/crankcase should now
be completely clean and dry, with all
components checked for wear or damage,
and repaired or overhauled as necessary.
Refit as many ancillary components as
possible, for safekeeping (see paragraphs 9
and 10 above). If reassembly is not to start
immediately, cover the block with a large
plastic bag to keep it clean, and protect the
machined surfaces as described above to
prevent rusting.
2B•16 Engine removal and general engine overhaul procedures
11.15 Measure the piston skirt diameter at
right-angles to the gudgeon pin axis, just
above the base of the skirt11.23A A “bottle-brush” hone will produce
better results if you have never honed
cylinders before11.23B The cylinder hone should leave a
smooth, cross-hatch pattern with the lines
intersecting at approximately a 60º angle
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This Chapter is concerned with those
features of the engine management system
that supply clean fuel and air to the engine,
meter it in the required proportions, and
dispose of the results. Since the emission
control sub-systems modify the functions of
both the fuel and exhaust sub-systems, all of
which are integral parts of the whole engine
management system, there are many cross-
references to Chapters 5 and 6. Information
on the electronic control system, its fault
diagnosis, sensors and actuators, is given in
Chapter 6.
The air intake system consists of several
plastics components designed to eliminate
induction roar as much as possible. The air
intake tube (opening behind the direction
indicator/headlight assembly) is connected,
via small and large resonators located under
the front left-hand wing, to the air cleaner
assembly in the engine compartment. Once it
has passed through the filter element and the
air mass meter, the air enters the plenum
chamber mounted above the throttle housing
and inlet manifold; the resonator mounted in
the engine compartment further reduces noise
levels.
The fuel system consists of a plastic tank
(mounted under the body, beneath the rear
seats), combined metal and plastic fuel hoses,
an electric fuel pump mounted in the fuel tank,
and an electronic fuel injection system.
The exhaust system consists of an exhaust
manifold, the front downpipe and catalytic
converter and, on production-fit systems, a
rear section incorporating two or three
silencers and the tailpipe assembly. The
service replacement exhaust system consists
of three or four sections: the front
downpipe/catalytic converter, the
intermediate pipe and front silencer, and the
tailpipe and rear silencer. On some versions,
the tailpipe is in two pieces, with two rear
silencers. The system is suspended
throughout its entire length by rubber
mountings.
Extreme caution should be exercised when
dealing with either the fuel or exhaust
systems. Fuel is a primary element for
combustion. Be very careful! The exhaust
system is an area for exercising caution, as it
operates at very high temperatures. Serious
burns can result from even momentary
contact with any part of the exhaust system,
and the fire risk is ever-present. The catalytic
converter in particular runs at very high
temperatures - refer to the information in
Chapter 6.
Warning: Many of the procedures
in this Chapter require the
removal of fuel lines and
connections, which may result in
some fuel spillage. Petrol is extremely
flammable, so take extra precautionswhen you work on any part of the fuel
system. Don’t smoke, or allow open flames
or bare light bulbs, near the work area.
Don’t work in a garage where a natural
gas-type appliance (such as a water
heater or clothes dryer) with a pilot light is
present. If you spill any fuel on your skin,
rinse it off immediately with soap and
water. When you perform any kind of work
on the fuel system, wear safety glasses,
and have a Class B type fire extinguisher
on hand. Before carrying out any operation
on the fuel system, refer also to the
precautions given in “Safety first!” at the
beginning of this manual, and follow them
implicitly. Petrol is a highly-dangerous and
volatile liquid, and the precautions
necessary when handling it cannot be
overstressed.
Warning: The fuel system will
remain pressurised for long
periods of time after the engine is
switched off - this pressure must
be released before any part of the system
is disturbed. Petrol is extremely
flammable, so take extra precautions
when you work on any part of the fuel
system. Don’t smoke, or allow open flames
or bare light bulbs, near the work area.
Don’t work in a garage where a natural
gas-type appliance (such as a water
heater or clothes dryer) with a pilot light is
present. If you spill any fuel on your skin,
rinse it off immediately with soap and
water. When you perform any kind of work
on the fuel system, wear safety glasses,
and have a Class B type fire extinguisher
on hand.
1The fuel system referred to in this Chapter
is defined as the fuel tank and tank-mounted
fuel pump/fuel gauge sender unit, the fuel
filter, the fuel injectors and the pressure
regulator in the injector rail, and the metal
pipes and flexible hoses of the fuel lines
between these components. All these contain
fuel, which will be under pressure while the
engine is running and/or while the ignition is
switched on.
2The pressure will remain for some time after
the ignition has been switched off, and must
be relieved before any of these components is
disturbed for servicing work.
3The simplest method is simply to
disconnect the fuel pump’s electrical supply
while the engine is running - either by
removing the fuel pump fuse (number 14), or
by lifting the red button on the fuel cut-off
switch (see Section 13) - and to allow the
engine to idle until it dies through lack of fuel
pressure. Turn the engine over once or twice
on the starter to ensure that all pressure is
released, then switch off the ignition; do not
forget to refit the fuse (or depress the redbutton, as appropriate) when work is
complete.
4The Ford method of depressurisation is to
use service tool 29-033 fitted to the fuel rail
pressure test/release fitting - a Schrader-type
valve with a blue plastic cap, located on the
union of the fuel feed line and the fuel rail - to
release the pressure, using a suitable
container and wads of rag to catch the spilt
fuel. Do notsimply depress the valve core to
release fuel pressure - droplets of fuel will
spray out, with a consequent risk of fire, and
of personal injury through fuel getting into
your eyes.
Warning: Either procedure will
merely relieve the increased
pressure necessary for the
engine to run. Remember that
fuel will still be present in the system
components, and take precautions
accordingly before disconnecting any of
them.
5Note that, once the fuel system has been
depressurised and drained (even partially), it
will take significantly longer to restart the
engine - perhaps several seconds of cranking
- before the system is refilled and pressure
restored.
Warning: The fuel system
pressure must be released before
any part of the system is
disturbed - see Section 2. Petrol
is extremely flammable, so take extra
precautions when you work on any part of
the fuel system. Don’t smoke, or allow
open flames or bare light bulbs, near the
work area. Don’t work in a garage where a
natural gas-type appliance (such as a
water heater or clothes dryer) with a pilot
light is present. If you spill any fuel on your
skin, rinse it off immediately with soap and
water. When you perform any kind of work
on the fuel system, wear safety glasses,
and have a Class B type fire extinguisher
on hand.
Disconnecting and connecting
quick-release couplings
1Quick-release couplings are employed at all
unions in the fuel feed and return lines.
2Before disconnecting any fuel system
component, relieve the residual pressure in
the system (see Section 2), and equalise tank
pressure by removing the fuel filler cap.
Warning: This procedure will
merely relieve the increased
pressure necessary for the
engine to run - remember that
fuel will still be present in the system
components, and take precautions
accordingly before disconnecting any of
them.
3 Fuel lines and fittings-
general information
2 Fuel system - depressurisation
1 General information and
precautions
4•2 Fuel and exhaust systems
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