1997 JAGUAR XJ6 Suspension and steering systems

5The shock/coil spring assemblies must be
dismantled, and the coil springs installed on
the new shocks. Although the shock/coil
spring assembly is similar in appearance to
the a MacPherson strut/coil spring assembly,
the spring on this unit is much stiffer.
Therefore, DO NOT attempt to take apart this
unit yourself with a strut spring compressor
tool. Instead, take the unit to a Jaguar dealer
service department or to a Jaguar specialist
workshop and have the springs installed on
the new shocks by professionals.6If you are retrofitting conventional shocks -
rather than refitting the same or another pair
of self-levelling shocks - unplug the electrical
connector at the ride height sensor, and fill
the connector with silicone (see illustration)
to prevent it from shorting out and causing
electrical problems. Then disconnect and
remove all hydraulic lines (see illustrations).
7Refitting is the reverse of removal. Be sure
to tighten all fasteners to the torque values
listed in this Chapter’s Specifications.
8Remove the jack supporting the controlarm, refit the rear wheels and lower the
vehicle.
9Tighten the rear wheel nuts to the torque
listed in the Chapter 1 Specifications.
10If you retrofitted conventional shocks to a
vehicle formerly equipped with the self-
levelling rear suspension system, disconnect
the forward end of the hydraulic line from the
valve block and refit the plug included in the
kit (see illustrations). Then finish removing
the forward section of hydraulic line and the
brackets for the line (see illustration).
Suspension and steering systems 10•7
10
10.6a Where applicable, unplug the
connector to the ride height sensor and fill
the connector with silicone . . .10.6b . . . then disconnect and remove
both valve blocks . . .10.6c . . . and remove all associated
plumbing, including the metal line (arrow) to
the valve block in the engine compartment
3261 Jaguar XJ6 10.3 To detach the bottom of the shock absorber/coil spring from
the control arm, remove this nut and bolt, then pull out the bolt
10.4 To detach the top of the shock absorber/coil spring from the
body, remove these bolts (arrowed) - not all bolts are visible here
10.10a After the vehicle has been lowered,
disconnect the forward end of the
hydraulic line from the valve block . . .10.10b . . . refit the plug included in the
retrofit kit . . .10.10c . . . then remove these bracket
screws (arrowed), the brackets and the
forward section of hydraulic line

11If you installed another pair of self-
levelling shocks, or removed and installed the
same pair of self-levelling shocks, be sure to
top up the power hydraulic system reservoir
(see Chapter 1).
11 Hub carrier (rear)-
removal and refitting
4
1Loosen the wheel nuts, raise the rear of the
vehicle and support it securely on axle stands.
Remove the wheel.
2Remove the rear caliper and brake pads,
the caliper bracket, the brake disc, the
handbrake cable and the handbrake shoe
assembly (see Chapter 9).
3Disconnect the outer end of the propshaft
from the hub carrier (see Chapter 8).
4Remove the ABS sensor, the ABS harness
clip and cut off the cable tie which secures the
ABS harness to the carrier (see illustration).
5Remove the nut and bolt which attach the
carrier to the control arm (see illustration).
6Remove the hub carrier assembly.
7Refitting is the reverse of removal. Be sure
to tighten all fasteners to the torque values
listed in this Chapter’s Specifications.
12 Hub and bearing (rear)-
renewal
4
If you want to renew the rear hub and
bearing assembly (or the ABS trigger wheel),
remove the hub carrier (see Section 11), then
take the carrier to a Jaguar dealer service
department or to an automotive machine
workshop. These parts require a hydraulic
press and special fixtures to dismantle and
reassemble.
13 Control arm (rear)-
removal and refitting
4
1Loosen the wheel nuts, raise the rear of the
vehicle and support it securely on axle stands.
Remove the wheel.
2Remove the rear caliper and brake pads,
the caliper bracket, the brake disc, the
handbrake cable and the handbrake shoe
assembly (see Chapter 9).
3Disconnect the outer end of the propshaft
from the hub carrier (see Chapter 8).
4Disconnect the lower end of the shock
absorber/coil spring assembly from the
control arm (see Section 10).
5Remove the hub carrier (see Section 11).
6Remove the control arm pivot bolt nut (see
illustration).
7Support the differential/crossmember
assembly with a trolley jack. Place a block of
wood between the jack head and the
differential to protect the differential.
Disconnect the lower end of the differential
tie-bar (see illustration)and carefully lower
the differential crossmember just enough toallow the control arm pivot bolt to be pulled
out to the rear without hitting the boot well.
8Remove the control arm.
9Inspect the control arm pivot bolt bushings.
If they’re cracked, dried out or torn, take the
arm to an automotive machine workshop and
have them replaced.
10Refitting is the reverse of removal. Tighten
all suspension fasteners to the torque listed in
this Chapter’s Specifications. Tighten all
brake fasteners to the torque listed in the
Chapter 9 Specifications.
14 Steering wheel-
removal and refitting
1
Warning: If your car is equipped
with an airbag, do not attempt
this procedure. Have it done by a
dealer service department or
other qualified repair workshop.
1Disconnect the negative battery cable.
Caution: If the radio in your vehicle is
equipped with an anti-theft system, make
10•8 Suspension and steering systems
13.6 Hold the pivot bolt and unscrew
the nut13.7 Remove this nut (arrowed) and bolt
from the lower end of each tie-bar (right
above the control arm pivot)
3261 Jaguar XJ6 11.4 Before detaching the hub carrier from the rear control arm,
remove the ABS sensor (left arrow), detach the ABS harness clip
(right arrow) and cut the cable tie securing the harness
11.5 To detach the hub carrier from the rear control arm, remove
the carrier-to-control arm nut and bolt

sure you have the correct activation code
before disconnecting the battery.
2Pry off the centre pad (see illustration).
3Remove the steering wheel nut and mark
the relationship of the steering wheel hub to
the shaft (see illustration).
4Slide the steering wheel off the steering
shaft (see illustration).
5Refitting is the reverse of removal. Make
sure you align the match marks you made on
the steering wheel and the shaft. Tighten the
steering wheel nut to the torque listed in this
Chapter’s Specifications.
15 Tie-rod ends-
removal and refitting
2
1Loosen the wheel nuts, raise the front of the
vehicle and support it securely on axle stands.
Remove the front wheel.
2Back off the locknut that locks the tie-rod
end to the tie-rod, then paint an alignment
mark on the threads to ensure the new tie-rod
end is installed in the same position (see
illustration).
3Loosen the nut on the tie-rod ball stud, then
fit a small puller and pop the ball stud loose
(see illustration). Remove the nut and
separate the ball stud from the steering
knuckle. Unscrew the tie-rod end from the tie-
rod.
4Refitting is the reverse of removal. Make
sure you thread the tie-rod end all the way up
to the mark on the threads, but no further.
Tighten the ball stud nut to the torque listed in
this Chapter’s Specifications. Tighten the
locknut securely.
5Have the toe-in checked and, if necessary,
adjusted at a dealer service department or
alignment workshop.
16 Steering gear boots- renewal
2
1Remove the tie-rod ends (see Section 15).
2Cut the boot clamps at both ends of the old
boots (see illustration)and slide off the
boots.3While the boots are removed, inspect the
seals in the end of the steering gear. If they’re
leaking, have them replaced by a dealer
service department or other qualified repair
workshop, or replace the steering gear with a
new or rebuilt unit (see Section 17).
4Slide the new boots into place and refit new
boot clamps.
5Refit the tie-rod ends (see Section 15).
Suspension and steering systems 10•9
10
14.4 To remove the steering wheel,
simply pull it straight off15.2 Back off this locknut and mark the
threads to ensure that the new tie-rod end
is installed properly
15.3 Loosen the ball stud nut, fit a small
puller and pop the ball stud loose from the
steering knuckle
3261 Jaguar XJ6 14.2 To remove the centre pad from the steering wheel,
simply pry it off
14.3 After removing the steering wheel nut, make a pair of
alignment marks on the steering wheel and steering shaft to
ensure proper reassembly
16.2 Cut off the boot clamps (arrowed)
and slide the boot off the steering gear

17 Steering gear-
removal and refitting
3
Warning: On models with an
airbag, do not apply excessive
force or severe shock to the
steering column shaft, or
accidental deployment of the airbag could
occur.
1Using a large syringe or hand pump, empty
the power steering fluid reservoir.
2Loosen the wheel nuts, raise the vehicle
and support it securely on axle stands.
Remove the wheels.
3Mark the relationship of the steering shaft
U-joint to the steering gear pinion shaft (see
illustration)to ensure proper alignment when
they’re reassembled. Remove the nut and bolt
that clamp the U-joint to the pinion shaft.
4Disconnect the power steering pressure
and return lines from the steering gear. Place
a container under the lines to catch spilledfluid. Plug the lines to prevent excessive fluid
loss and contamination. Discard the sealing
washers (new ones should be used when
reassembling).
5Disconnect the tie-rod ends from the
steering knuckle arms (see Section 17).
6Remove the nuts and bolts from the steering
gear mounting brackets (see illustration).
7Remove the steering gear assembly,
detaching the U-joint as you lower it. Don’t
damage the steering gear dust boots.
8Refitting is the reverse of removal. Ensure the
marks you made on the U-joint and the pinion
shaft are aligned before you tighten the U-joint
clamp bolt and nut. Tighten the mounting bolts,
the tie-rod end nuts and the U-joint shaft
clamping bolts to the specified torque.
9After lowering the vehicle, fill the reservoir
with the recommended fluid (see Chapter 1).
10Bleed the power steering system (see
Section 19).
11Have the front wheels aligned by a dealer
service department or alignment workshop
after reassembly.
18 Power steering pump-
removal and refitting
3
1Raise the vehicle and support it securely on
axle stands. Remove the engine under-cover.
2Loosen the hose clamp and disconnect the
fluid return hose from the top of the pump
(see illustration)and drain the power steering
fluid from the reservoir into a clean container.
Unscrew the pressure line fitting from the
back of the pump. Plug the return hose and
the pressure line to prevent fluid from leaking
and to protect the power steering system
from contamination.
3Remove the bolts (see illustration)that
attach the power steering pump adapter to
the auxiliary shaft housing.
4Remove the power steering pump and
adapter.
5Take the power steering pump and adapter
to a Jaguar dealer service department and
have the adapter removed from the old pump
10•10 Suspension and steering systems
18.2 Disconnect the steering fluid return hose from the upper
pipe (arrowed) and disconnect the pressure line
from the back of the pump18.3 To detach the pump adapter from the auxiliary shaft
housing, remove these bolts
3261 Jaguar XJ6 17.3 Mark the relationship of the steering shaft U-joint to the
steering gear pinion shaft, then unscrew the pressure and return
line fittings (arrowed) - plug the lines to prevent contamination
from entering the system
17.6 To detach the steering gear from the vehicle, remove these
nuts and bolts (arrowed) from the mounting brackets (right
bracket shown, left bracket similar)

and installed on a new or rebuilt pump. (This
procedure requires special tools, and the
height of the driven coupling on the shaft
must be set with a depth gauge.)
6Refitting is the reverse of removal. Study
the accompanying photos carefully before
reattaching the adapter to the auxiliary shaft
housing (see illustrations). Be sure to tighten
the fasteners securely.
7Top up the fluid level in the reservoir (see
“Weekly checks” for vehicles with a separate
power steering system, or Chapter 1 for
vehicles with a power hydraulic system) and
bleed the system (Section 19).
19 Power steering system-
bleeding
1
1To bleed the power steering system, begin
by checking the power steering fluid level and
adding fluid if necessary (see “Weekly checks”
or Chapter 1, dependent on system fitted).
2Raise and support the front of the vehicle
on axle stands.
3Turn the steering wheel from lock-to-lock
several times and recheck the fluid level.
4Start the engine. Turn the steering wheel
from lock-to-lock again (three or four times)
and recheck the fluid level one more time.
5Lower the car to the ground. Run the
engine and again turn the wheels from lock-
to-lock several more times. Set the wheels
straight ahead and recheck the fluid level.
20 Wheels and tyres-
general information
1All vehicles covered by this manual are
equipped with steel belted radial tyres. Use ofother size or type of tyres may affect the ride
and handling of the vehicle. Don’t mix
different types of tyres, such as radials and
bias belted, on the same vehicle as handling
may be seriously affected. It’s recommended
that tyres be replaced in pairs on the same
axle, but if only one tyre is being replaced, be
sure it’s the same size, structure and tread
design as the other.
2Because tyre pressure has a substantial
effect on handling and wear, the pressure on
all tyres should be checked at least once a
month or before any extended trips (see
Chapter 1).
3Wheels must be replaced if they are bent,
dented, leak air, have elongated bolt holes,
are heavily rusted, out of vertical symmetry or
if the wheel nuts won’t stay tight. Wheel
repairs that use welding or peening are not
recommended.
4Tyre and wheel balance is important in the
overall handling, braking and performance of
the vehicle. Unbalanced wheels can adversely
affect handling and ride characteristics as well
as tyre life. Whenever a tyre is installed on a
wheel, the tyre and wheel should be balanced
by a workshop with the proper equipment.
21 Wheel alignment-
general information
A wheel alignment refers to the adjustments
made to the wheels so they are in proper
angular relationship to the suspension and the
ground. Wheels that are out of proper
alignment not only affect vehicle control, but
also increase tyre wear. The alignment angles
normally measured are camber, caster and
toe-in (see illustration). Front-wheel toe-in and
caster are adjustable; camber is not adjustable.
Suspension and steering systems 10•11
10
3261 Jaguar XJ6 18.6a This driven coupling is the reason
you can’t remove the adapter from the
pump at home; this requires special tools,
and the coupling must be installed on the
shaft of the new or rebuilt pump at a very
precise height - if you try to pry off the
coupling, you will damage it
18.6b The coupling disc fits onto the
driven coupling on the pump side . . .18.6c . . . and on the drive coupling on the
auxiliary shaft side; note that the two lugs on
each drive coupling fit into their
corresponding slots in the coupling disc,
180° apart - all four lugs must be properly
engaged or you won’t be able to bolt the
adapter to the auxiliary shaft housing
21.1 Front end alignment details
A minus B = C (degrees camber)
E minus F = toe-in (measured in inches)
G - toe-in (expressed in degrees)

None of these three angles are adjustable on
the rear wheels. Even the non-adjustable
angles should be checked to determine if any
of the suspension components are bent.
Getting the proper wheel alignment is a
very exacting process, one in which
complicated and expensive machines are
necessary to perform the job properly.
Because of this, you should have a technician
with the proper equipment perform these
tasks. We will, however, use this space to give
you a basic idea of what is involved with a
wheel alignment so you can better understand
the process and deal intelligently with the
workshop that does the work.Toe-in is the turning in of the wheels. The
purpose of a toe specification is to ensure
parallel rolling of the wheels. In a vehicle with
zero toe-in, the distance between the front
edges of the wheels will be the same as the
distance between the rear edges of the
wheels. The actual amount of toe-in is
normally only a fraction of an inch. Toe-in is
controlled by the tie-rod end position on the
tie-rod. Incorrect toe-in will cause the tyres to
wear improperly by making them scrub
against the road surface.
Camber is the tilting of the wheels from
vertical when viewed from one end of the
vehicle. When the wheels tilt out at the top, the camber is said to be positive (+). When
the wheels tilt in at the top the camber is
negative (-). The amount of tilt is measured in
degrees from vertical and this measurement is
called the camber angle. This angle affects the
amount of tyre tread which contacts the road
and compensates for changes in the suspension
geometry when the vehicle is cornering or
travelling over an undulating surface.
Caster is the tilting of the front steering axis
from the vertical. A tilt toward the rear is
positive caster and a tilt toward the front is
negative caster. Caster is adjusted by moving
shims from one side of the upper control arm
balljoint to the other.
10•12 Suspension and steering systems
3261 Jaguar XJ6

3261 Jaguar XJ6
11
Chapter 11
Bodywork and fittings
Body - maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Body repair - major damage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Body repair - minor damage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Bonnet - removal, refitting and adjustment . . . . . . . . . . . . . . . . . . . . 10
Bonnet and boot lid support struts - removal and refitting . . . . . . . . 9
Bonnet release latch and cable - removal and refitting . . . . . . . . . . . 11
Boot lid - removal, refitting and adjustment . . . . . . . . . . . . . . . . . . . 16
Boot lid latch and lock cylinder - removal and refitting . . . . . . . . . . . 17
Bumpers - removal and refitting . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Centre console - removal and refitting . . . . . . . . . . . . . . . . . . . . . . . 24
Cowl cover - removal and refitting . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Dashboard trim panels - removal and refitting . . . . . . . . . . . . . . . . . 26
Door - removal, refitting and adjustment . . . . . . . . . . . . . . . . . . . . . . 19
Door latch, lock cylinder and handles - removal and refitting . . . . . . 20
Door trim panel - removal and refitting . . . . . . . . . . . . . . . . . . . . . . . 18Door window glass - removal and refitting . . . . . . . . . . . . . . . . . . . . 22
Door window glass regulator - removal and refitting . . . . . . . . . . . . . 21
Front spoiler - removal and refitting . . . . . . . . . . . . . . . . . . . . . . . . . 13
Front wing - removal and refitting . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
General information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Hinges and locks - maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Instrument cluster housing - removal and refitting . . . . . . . . . . . . . . 25
Outside mirrors - removal and refitting . . . . . . . . . . . . . . . . . . . . . . . 23
Radiator grille - removal and refitting . . . . . . . . . . . . . . . . . . . . . . . . 12
Seats - removal and refitting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Steering column cover - removal and refitting . . . . . . . . . . . . . . . . . 27
Upholstery and carpets - maintenance . . . . . . . . . . . . . . . . . . . . . . . 4
Vinyl trim - maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Windscreen and fixed glass - replacement . . . . . . . . . . . . . . . . . . . . 8
11•1
Contents
Easy,suitable for
novice with little
experienceFairly easy,suitable
for beginner with
some experienceFairly difficult,
suitable for competent
DIY mechanic
Difficult,suitable for
experienced DIY
mechanicVery difficult,
suitable for expert DIY
or professional
Degrees of difficulty
54321
1 General information
These models feature a “unibody”
construction, using a floor pan with front and
rear frame side rails which support the body
components, front and rear suspension
systems and other mechanical components.
Certain components are particularly vulnerable
to accident damage and can be unbolted and
repaired or replaced. Among these parts are
the body mouldings, bumpers, front wings,
bonnet and boot lids and all glass.
Only general body maintenance practices
and body panel repair procedures within the
scope of the do-it-yourselfer are included in
this Chapter.
2 Body- maintenance
1
1The condition of your vehicle’s body is very
important, because the resale value depends
a great deal on it. It’s much more difficult to
repair a neglected or damaged body than it is
to repair mechanical components. The hidden
areas of the body, such as the wheel wells,
the frame and the engine compartment, areequally important, although they don’t require
as frequent attention as the rest of the body.
2Once a year, or every 12,000 miles, it’s a
good idea to have the underside of the body
steam cleaned. All traces of dirt and oil will be
removed and the area can then be inspected
carefully for rust, damaged brake lines, frayed
electrical wires, damaged cables and other
problems. The front suspension components
should be greased after completion of this job.
3At the same time, clean the engine and the
engine compartment with a steam cleaner or
water soluble degreaser.
4The wheel wells should be given close
attention, since undercoating can peel away
and stones and dirt thrown up by the tyres
can cause the paint to chip and flake, allowing
rust to set in. If rust is found, clean down to
the bare metal and apply an anti-rust paint.
5The body should be washed about once a
week. Wet the vehicle thoroughly to soften the
dirt, then wash it down with a soft sponge and
plenty of clean soapy water. If the surplus dirt
is not washed off very carefully, it can wear
down the paint.
6Spots of tar or asphalt thrown up from the
road should be removed with a cloth soaked
in solvent.
7Once every six months, wax the body and
chrome trim. If a chrome cleaner is used to
remove rust from any of the vehicle’s plated
parts, remember that the cleaner also removes
part of the chrome, so use it sparingly.
3 Vinyl trim- maintenance
1
Don’t clean vinyl trim with detergents,
caustic soap or petroleum-based cleaners.
Plain soap and water works just fine, with a
soft brush to clean dirt that may be ingrained.
Wash the vinyl as frequently as the rest of the
vehicle.
After cleaning, application of a high quality
rubber and vinyl protectant will help prevent
oxidation and cracks. The protectant can also
be applied to weather-stripping, vacuum lines
and rubber hoses (which often fail as a result
of chemical degradation) and to the tyres.
4 Upholstery and carpets-
maintenance
1
1Every three months remove the carpets or
mats and clean the interior of the vehicle
(more frequently if necessary). Vacuum the
upholstery and carpets to remove loose dirt
and dust.
2Leather upholstery requires special care.
Stains should be removed with warm water
and a very mild soap solution. Use a clean,
damp cloth to remove the soap, then wipe

3261 Jaguar XJ6
MOT test checksREF•11
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. Allowthe engine speed to return to idle, and watch
for 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 of 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