Land Rover Defender Owners Handbook Rover

Workshop maintenance
138 Tdi engine
Engine performance will be seriously
affected if the air cleaner element becomes
choked with dust and other airborne
particles.
·Release the two retaining clips (1).
·Raise the air cleaner slightly from its
cradle to improve access to the element.
·Unscrew the wing nut (2) and remove the
end cover.
·Unscrew the wing nut (3) and withdraw
the element.
·Clean the interior and exterior of the
casing and cover.
·Fit a new element, seal first, into the
casing.
·Secure the...

Workshop maintenance
139 Air cleaner dump valve check - all engines
The dump valve (8) is situated on the
underside of the element housing.
·Squeeze open the dump valve (as
illustration) and check that the interior is
clean. Renew the valve if perished. 

Workshop maintenance
140 SPARK PLUG CHECK/RENEWAL
(petrol engines)
V8 engine
·Remove the HT leads from the spark
plugs.
·Remove the plugs using a spark plug
socket and ratchet.
·If they are in poor condition, replace with
new plugs of the correct specification (see
General data).
·Set the spark plug gaps to the correct
setting (see General data).
·Fit the spark plugs and washers - DO NOT
OVERTIGHTEN.
NOTE:Fitting incorrect grades of spark plug,
may lead to piston overheating and engine
failure.
·Refit...

Workshop maintenance
141 DISTRIBUTOR
V8 engines
WARNING
ALWAYS disconnect the battery negative
lead before carrying out any maintenance on
the ignition and electrical systems.
The internal operating parts of the distributor
are protected by a plastic insulating cover (1)
and are pre-set during manufacture - they do
not require maintenance.
WARNING
DO NOT remove or tamper with the plastic
insulating cover.
·Clean the outer surfaces of the distributor
cap to remove dirt or grease.
·Unclip the cap and check...

Workshop maintenance
142 DRIVE BELTS
Driving belt tension
All pulleys and belts should be examined
regularly for any damage, deterioration or
fouling (grit, mud, oil etc). Replace or clean
where necessary.
After every off-road session, the drive belts
should be inspected for cuts and possible
damage caused by stones. If a belt has
jumped, reposition it correctly and, if
necessary, replace it at the earliest
opportunity.
WARNING
Before checking or adjusting any drive belt;
to prevent the possibility of...

Workshop maintenance
143 ALTERNATOR DRIVE BELT
V8 engine (without air-conditioning)
Check the belt deflection with thumb pressure,
mid-way between the alternator and
crankshaft pulleys. Movement should be
approximately 12 mm (0.5 in). If adjustment
is necessary;
·Turn the starter switch to position 0 and
disconnect the battery negative lead.
·Loosen bolts (2).
·Loosen the adjustment bolts (3).
·Pivot the alternator away from, or towards
the engine, to increase, or reduce tension.
·Tighten the UPPER...

Workshop maintenance
144
WARNING
DO NOT use a lever to move the alternator.
ONLY apply hand pressure to the alternator
body when adjusting drive belt tension.
·Tighten the adjustment link clamp and
pivot bolts (2).
·Tighten the alternator pivot bolts (3).
·Connect the battery, run the engine for five
minutes at a fast idle and then switch off.
·Re-check belt tension. 

Workshop maintenance
145 POWER STEERING PUMP DRIVE BELT
V8 engine
(without air-conditioning)
Check belt deflection with thumb pressure
mid-way between the crankshaft and steering
pump pulley. Movement should be between 4
and 6 mm (0.16 and 0.25 in). If adjustment is
necessary;
·Turn the starter switch to position 0 and
disconnect the battery negative lead.
·Slacken the two pivot bolts (2).
·Slacken the pump adjustment clamp bolt
(3).
·Move the pump in the required direction to
obtain the correct...

Workshop maintenance
146 POWER STEERING PUMP DRIVE BELT
V8 engine
(with air-conditioning)
Check the belt deflection with thumb pressure,
mid-way between the crankshaft and steering
pump pulleys. Movement should be between
4 and 6 mm (0.16 and 0.25 in). If adjustment
is necessary;
·Turn the starter switch to position 0 and
disconnect the battery negative lead.
·Slacken the alternator adjustment link
clamp and pivot bolts (2) (see Alternator
drive belt - V8 engine with
air-conditioning).
·Slacken the...

Workshop maintenance
147 AIR CONDITIONING COMPRESSOR
DRIVE BELT
Tdi engine
Correct belt tension an only be achieved using
a suitably calibrated torque meter.
·Slacken the 3 bolts (1) securing the
tensioner.
·Apply a clockwise torque of 35 Nm to the
square drive (2) of the tensioner and
tighten the bolts to 25 Nm.