1994 JAGUAR XJ6 brake

General Fitting Instructions
A3.2 GENERAL FITTING INSTRUCTIONS
A3.2.1
Always fit covers to protect the wings before commencing work in the engine compartment. Cover the seats and
carpets, wear clean overalls and wash hands or wear gloves before working inside the car. Avoid spilling hydraulic
fluid, anti
-freeze or battery acid on the paintwork. In the event of spillage, wash off with water immediately. Use poly- thene sheets in the boot to protect carpets. Always use the recommended service tool, or a satisfactory equivalent,
where specified. Protect temporarily exposed screw threads by replacing nuts or fitting caps.
Precautions Against Damage To The Vehicle
A3.2.2 Preparation
Before disassembly, clean the surrounding area as thoroughly as possible. When components have been removed,
blank off any exposed openings using greaseproof paper and masking tape. Immediately seal fuel, oil and hydraulic
lines when separated, using plastic caps or plugs, to prevent loss of fluid and the entry of dirt. Close the open ends
of oilways, exposed by component removal, with tapered hardwood plugs or readily visible plastic plugs. Immediately
a component is removed, place
it in a suitable container; use a separate container for each component and its asso- ciated parts. Before dismantling a component, clean it thoroughly with a recommended cleaning agent: check that the
agent will not damage any of the materials within the component. Clean the bench and obtain marking materials, la-
bels, containers and locking wire before dismantling a component.
A3.2.3 Dismantling
Observe scrupulous cleanliness when dismantling components, particularly when parts of the brake, fuel or hydraulic
system are being worked on. A particle of dirt or a fragment of cloth could cause a dangerous malfunction if trapped in these systems. Clean all tapped holes, crevices, oilways and fluid passages with compressed air.
WRNIFLG: DO NOT PERMIT COMPRESSED AIR TO ENTER AN OPEN WOUND. ALWAYS USE EVE PROTECTION
WHEN USING COMPRESSED AIR.
Ensure that any 'O'-rings used for sealing are correctly refitted or renewed if disturbed. Mark mating parts to ensure
that they are replaced as dismantled. Whenever possible use marking materials which avoid the possibilities of caus- ing distortion or the initiation of cracks, which could occur if a center punch or scriber were used. Wire together mating
parts where necessary to prevent accidental interchange (e.g roller bearing components). Tie labels on to all parts to
be renewed and to parts requiring further inspection before being passed for reassembly.
Place labelled parts and other parts for rebuild
in separate containers.
Do not discard a part which is due for renewal until it has been compared with the new part, to ensure that the correct
part has been obtained.
A3.2.4 Inspection
Before inspecting a component for wear or performing a dimensional check, ensure that it is absolutely clean; a slight
smear of grease can conceal an incipient failure. When a component is to be checked dimensionally against figures
quoted for
it, use the correct equipment (surface plates, micrometers, dial gauges etc.) in serviceable condition. The
use of makeshift equipment can be dangerous. Reject a component if its dimensions are outside the limits quoted,
or if damage is apparent. A part may be refitted if its critical dimension is exactly to the limit size and it is otherwise
satisfactory. Use Plastigauge 12 Type PG-1 for checking bearing surface clearance e.g. big end bearing shell to crank
journal. Instructions for the use of Plastigauge and a scale giving bearing clearances in steps of
0,0025 mm (0.0001
in) are supplied with the package.
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X300 VSM Issue 1 August 1994 2

General Fitting Instructions
Pressordrifttheseal in tothefull depthofthe housing ifthe housing is shouldered,orflush withthefaceofthe housing
where no shoulder is provided.
Note: Careless fitting of oil seals, which can result in damage to the seal and sealing surfaces, accounts for most
cases of failure of seals. Care in fitting is essential
if good results are to be obtained.
A3.2.7 joints And joint Faces
Remove all traces of old jointing materials prior to reassembly. Inspect joint faces for scratches or burrs and remove
with a fine file or oilstone; do not allow swarf or dirt to enter tapped holes or enclosed parts. Blow out any pipes, chan- nels or crevices with compressed air, refitting or renewing any 0-rings or seals which have been displaced by the com- pressed air.
Always use the specified gaskets. Use jointing compound only when recommended, otherwise fit joints dry. When
jointing compound is used, apply in
a thin film to metal surfaces; take great care to prevent it from entering oilways, pipes or blind tapped holes.
A3.2.8
Before removing a hose from the brake or power steering systems, thoroughly clean the end fittings and the area sur- rounding them. Obtain blanking caps beforedetaching hosefittings,sothat portscan becovered to excludedirt. Clean
the hose externally and blow through with compressed air. Examine the hose carefully for cracks, separation of plies,
security of end fittings and external damage. Reject any hose found to be faulty. When refitting the hose, ensure that
no unnecessary bends are introduced and that the hose is not twisted before or during tightening of union nuts.
Do not store hydraulic fluid in an unsealed container because it will absorb water. Fluid in this condition would be dan- gerous to use due to a lowering of its boiling point. Do not allow hydraulic fluid to be contaminated with mineral oil,
or use a container which has previously contained mineral oil.
Do not re-use fluid bled from the system. Always use clean brake fluid, or a recommended alternative, to clean the
hydraulic components. Fit a blanking cap to the hydraulic union and
a plug to its mating socket, after removal from
the vehicle, to prevent ingress of dirt. Absolute cleanliness must be observed with hydraulic components at all times.
After any work has been performed on hydraulicsystems, inspect carefully for leaks underneath the car while a second
operator applies maximum pressure to the brakes (with the engine running) and operates the steering.
Hydraulic Flexible Pipes And Hoses
A3.2.9 Metric
Bolt Identification
An IS0 metric bolt or screw, made of steel and larger than
6mm in diameter can be identified by the symbols ISOM or M embossed on top of the head (Fig. 1 ). In addition to marks
to identify the manufacturer, the head is also marked with
symbols to indicate the strength grade eg
8.8, 10.9, 12.9 or 14.9. The first figure gives the minimum strength of the bolt
material in tens of kgf / mm2. Zinc plated IS0 metric bolts
and nuts are chromate passivated and coloured greenish- khaki to gold-bronze.
A3.2.10 Metric Nut Identification
A nut with an IS0 metricthread is marked on one face (1 Fig. 2) or on one of the flats (2 Fig. 2) of the hexagon with the
strength grade symbol 8, 12 or 14. Some nuts with a
strength 4,5 or 6 are also marked and some have the metric
symbol M on the flat which is opposite to the strength grade
marking.
Aclockfacesystem is used as an alternative method of indi
- cating the strength grade (3 Fig. 2). The external chamfers
or a face of the nut is marked in a position relative to the ap-
propriate hour mark on a clock face to indicate the strength
grade. A dot is used to locate the 12 o’clock position and a dash to indicate the strength grade. If the grade is above 12,
two dots identify the 12 o’clock position. Fig.
1
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Fig. 2
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General Fitting Instructions
Issue 1 August 1994 5 X300 VSM I
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A3.2.11 Hydraulic Fittings - Metrification
Metric fastenings are being used increasingly in motor vehicle manufacture, but the use of some UNF threaded parts
must be expected. Technicians must take note of warnings that dangers exist while UNF and metricthreaded hydraulic
parts continue to be used together.
UNF pipe nuts should not be fitted into metric parts, nor
vice
-versa. Experience indicates that it is not safe to rely
upon the difference in thread size. Providing permanent
identification of metric parts is not easy, but recognition has
been assisted by the following means:
All metric pipe nuts, hose ends, unions and bleed screws are
coloured black. The hexagon area of pipe nuts is indented
with the letter 'M'. Metric and UNF pipe nuts are slightly dif
-
ferent in shape.
hlnfe: In the illustrations on this page, 'A' indicates the
metrictype and 'B'the UNF type. The metric female
nut is always used with
a trumpet flared pipe and the
metric male nut is always used with a convex flared
pipe (Fig.
1).
Metric ports in brake cylinders and calipers have no counter-
bores; however, a few cylinders with UNF threads also have
no counterbore. Therefore, all ports with counterbores are
UNF, but ports not counterbored are most likely to be metric
(Fig.
2).
The colour of the protective plugs fitted to cylinder ports
indicate the size and the type of the threads, but the primary
function
ofthe plugs is to protect thecylinder from contami- nation and is not intended as a positive means of identifica- tion. As an indication, the plug colours and thread sizes are:
Colour Size Colour Size
Red 318 in. x 24 UNF Black 10 x 1,0 mm
Green 7/16 in. x 20 UNF Grey 12 x 1,0 mm
Yellow 112 in. x 20 UNF Brown 14 x 1,5 mm
Pink 5/8 in. x 18 UNF
Fig. 1
A 6 I 507 007
Fig. 2

General Fitting Instructions
In Fig. 1 and Fig. 2, this page,’K indicates the metric
type and ’B’ the UNF type.
Hose ends differ slightly between metric and UNF (Fig.
1). Gaskets are not used with metric hoses; the metric hose fit- ting seals against the bottom of the port and consequently
there is a gap between the hexagonal face of the hose fitting
and the cylinder (Fig.
2A). The UNF hose fitting is sealed on
the brakecylinder or caliperface by a copper gasket (Fig.
2B).
Pipe sizes (outside diameter) for UNF are 3/16 in., 1/4 in. and
5/16 in. Metric pipe sizes are 4,75 mm, 6 mm and 8 mm. The 4,75 mm pipe is exactly the same diameter as 3/16 in. pipe.
The 6 mm pipe is 0.014 in. smaller than 1/4 in. pipe. The 8
mm pipe is 0.002 in. larger than 5/16 in. pipe.
Convex flares for metric brake pipes have a different form
thanthoseon UNF brake pipes. When making pipesfor met
- ric equipment, metric pipe flaring tools must be used.
The greatest danger lies with the confusion of
10 mm and 3/8 in. UNF pipe nuts used for 3/16 in. (or 4,75 mm) pipe. The 318 in. UNF pipe nut or hose can be screwed into a 10 mm port, but is very slack and easily stripped. The thread en- gagement is very weak and cannot provide an adequate
seal. The opposite condition, a 10 mm nut in a 318 in. port,
will cause difficulty during fitting. The
10 mm nut will screw
in for one or two turns and then seize. It has a crossed thread
‘feel’ and
it is impossible to force the nut far enough to seal
the pipe. With female pipe nutsthe position is reversed. The
other combinations are so different that there is no danger
of confusion.
A3.2.12 Keys And Keyways
Remove burrs from the edges of keyways with a fine file and
clean thoroughly before attempting to refit the key. Clean
and inspect the key closely. Keys are suitable for refitting
only
if no indentations exist (which would indicate the onset
of wear).
A3.2.13 Split Pins
Fit new split pins throughout when replacing any unit. Al- ways fit split pins where split pins were originally used. Do not substitute spring washers for split pins. All split pins
should be fitted as shown (Fig. 3) unless otherwise stated.
A3.2.14 Tab Washers
Fit new tab washers in all places where they where used
originally. Never refit a used tab washer. Ensure that the
new tab washer is of the same design as that which was re
- moved.
A3.2.15 Special Fixing
Bolts with a blue coating applied to the thread are used in various areas ofthevehicle. Should any of these bolts be re- moved, they MUST be replaced with NEW bolts of the same
type. Nyloc nuts are used in various areas of the vehicle. If removed these MUST be replaced with NEW nuts of the
same type.
-A
507 008
Fia. 1
Fia. 2
Fig. 3 I
X300 VSM Issue 1 August 1994 6

- A3.2.19 Unified Thread Identification - Bolts
A circular recess is stamped in the upper surface of the bolt
head (1 Fig. 1).
A3.2.20 Unified Thread Identification - Nuts
A continuous line of circles is stamped on one of the flats of
the hexagon, parallel to the axis of the nut (2 Fig. 1).
A3.2.2 1 Unified Thread Identification - Studs, Brake
Rods, etc.
The component is reduced to the core diameter for a short
length at its extremity (3 Fig. 1).
A3.2.16 Nuts
When tightening a slotted or castellated nut, never slacken it in order to insert the split pin or locking wire, but tighten
it to align the next slot. The exception is in those recommended cases where slackening the nut forms part of an adjust- ment e.g. bearing endfloat or preload adjustment. If difficulty is experienced, alternative washers or nuts should be
selected, or a washer of a different thickness used. Where self-locking nuts have been removed, replace them with
new ones.
A3.2.17 Locking Wire
Fit new locking wire of the correct type to the assemblies incorporating it. Arrange the wire so that its tension tends
to tighten the bolt heads, or nuts, to which it is fitted.
A3.2.18 Screw Threads
Metricthreads to IS0 standards and UNF threads are used. See below forthread identification. Fixings with damaged
threads must always be discarded. Cleaning the threads with a die or tap impairs the strength and closeness of fit and
is not recommended. Always ensure that replacement bolts are of equal strength to those removed. Do not allow oil,
grease or jointing compound to enter blind threaded holes because the hydraulic action which would be generated
when screwing in the bolt or stud could split the housing. Oil the thread lightly before tightening to ensure
a free run- ning thread, except in the case of self locking nuts. Always tighten a nut or bolt to the recommended torque figure.
Damaged or corroded threads will affect the torque reading. To check or retighten a bolt or screw to a specified torque
figure, first slacken by a quarter of a turn, then retighten to the correct figure.
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‘2 507 011
Fig. 1
X300 VSM 7 Issue 1 August 1994

B C D
K J H G
A. Power steering -Warning F. Headlamp beam setting adjustment B. Shock absorber fixings -Warning G. Emission control data
C. Brake fluid type -Warning H. El 1 legislation label (not all markets) D. Clutch fluid type -Warning J. Rotating components - Warning
E. Coolant pressureltemperature -Warning K. Vacuum pipe routing
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