Range Rover. Manual — part 18
GENERAL FITTING REMINDERS
7
INFORMATION
Hose clips
4. Markings are usually provided on the hose to
indicate the the correct clip position. If no
markings are provided, position the clip directly
behind the retaining lip at the end of the stub as
shown.
5. Worm drive clips should be oriented with the
crimped side of the drive housing facing towards
the end of the hose, or the hose may become
pinched between the clip and the stub pipe
retaining lip.
6. Worm drive clips should be tightened to
3 Nm (2
lbf.ft) unless otherwise stated.
CAUTION: Ensure that hose clips do not
foul adjacent components.
Heat protection
7. Always ensure that heatshields and protective
sheathing are in good condition. Replace if
damage is evident.
8. Particular care must be taken when routing
hoses close to hot engine components, such as
the exhaust manifold and the Exhaust Gas
Recirculation (EGR) pipe.
CAUTION: Hoses will relax and deflect
slightly when hot; ensure this movement
is taken into account when routing and
securing hoses.
METRIC BOLT IDENTIFICATION
1. An ISO metric bolt or screw, made of steel and
larger than 6 mm in diameter can be identified by
either of the symbols ISO M or M embossed or
indented on top of the head.
2. In addition to marks to identify the manufacture,
the head is also marked with symbols to indicate
the strength grade, e.g. 8.8, 12.9 or 14.9, where
the first figure gives the minimum tensile
strength of the bolt material in tens of kgf/mm
2
.
3. Zinc plated ISO metric bolts and nuts are
chromate passivated, a gold-bronze colour.
07
GENERAL FITTING REMINDERS
NEW RANGE ROVER
8
INFORMATION
METRIC NUT IDENTIFICATION
1. A nut with an ISO metric thread is marked on
one face or on one of the flats 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 opposite the strength grade marking.
2. A clock face system is used as an alternative
method of indicating the strength grade. The
external chamfers or a face of the nut is marked
in a position relative to the appropriate hour
mark on a clock face to indicate the strength
grade.
3. 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.
KEYS AND KEYWAYS
1. Remove burrs from edges of keyways with a fine
file and clean thoroughly before attempting to
refit key.
2. Clean and inspect key closely; keys are suitable
for refitting only if indistinguishable from new, as
any indentation may indicate the onset of wear.
TAB WASHERS
1. Fit new washers in all places where they are
used. Always fit a new tab washer.
2. Ensure that the new tab washer is of the same
design as that replaced.
SPLIT PINS
1. Fit new split pins throughout when replacing any
unit.
2. Always fit split pins where cotter pins were
originally used. Do not substitute spring
washers: there is always a good reason for the
use of a split pin.
3. All split pins should be fitted as shown unless
otherwise stated.
GENERAL FITTING REMINDERS
9
INFORMATION
NUTS
1. When tightening a slotted or castellated nut
never loosen it back to insert split pin or locking
wire except in those recommended cases where
this forms part of an adjustment. If difficulty is
experienced, alternative washers or nuts should
be selected, or washer thickness reduced.
2. Where self-locking nuts have been removed it is
advisable to replace them with new ones of the
same type.
NOTE: Where bearing pre-load is involved
nuts should be tightened in accordance
with special instructions.
LOCKING WIRE
1. Fit new locking wire of the correct type for all
assemblies incorporating it.
2. Arrange wire so that its tension tends to tighten
the bolt heads, or nuts, to which it is fitted.
SCREW THREADS
1. Both UNF and Metric threads to ISO standards
are used. See below for thread identification.
2. Damaged threads must always be discarded.
Cleaning up threads with a die or tap impairs the
strength and closeness of fit of the threads and
is not recommended.
3. Always ensure that replacement bolts are at
least equal in strength to those replaced.
4. Do not allow oil, grease or jointing compound to
enter blind threaded holes. The hydraulic action
on screwing in the bolt or stud could split the
housing.
5. Always tighten a nut or bolt to the recommended
torque value. Damaged or corroded threads can
affect the torque reading.
6. To check or re-tighten a bolt or screw to a
specified torque value first loosen a quarter of a
turn, then re-tighten to the correct value.
7. Oil thread lightly before tightening to ensure a
free running thread, except in the case of
threads treated with sealant/lubricant, and
self-locking nuts.
UNIFIED THREAD IDENTIFICATION
1. Bolts
A circular recess is stamped in the upper surface
of the bolt head.
2. Nuts
A continuous line of circles is indented on one of
the flats of the hexagon, parallel to the axis of
the nut.
3. Studs, Brake Rods, etc.
The component is reduced to the core diameter
for a short length at its extremity.
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