Land Rover Defender 90 110 130 Workshop 1997 Rover Manual

							Workshop maintenance 
Air cleaner dump valve check -all engines 
The dump valve (B) 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. 
139  
						

							Workshop maintenance 
SPARK PLUG CHECK/RENEWAL 
(petrol engines) 
. J628 
VB 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 the HT leads in the correct order (as 
illustration), ensuring that the leads are 
firmly seated onto the plugs. 
140 
IGNITION WIRING & HT LEAD CHECK 
Check the HT leads for insulation cracking, or 
corrosion at end contacts. If the HT leads are 
damaged, replace with new leads of the same 
specification. 
NOTE: Ensure leads are reconnected in the 
correct order or the engine will misfire .  
						

							Workshop maintenance 
DISTRIBUTOR 
VB engines 
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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. 
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DO NOT remove or tamper with the plastic 
insulating cover. 
141 
• Clean the outer surfaces of the distributor 
cap to remove dirt or grease. 
• Unclip the cap and check it for cracks. 
Clean the inside of the cap with a dry, lint 
free cloth. 
• Remove the rotor arm and check it for 
wear -replace if necessary. 
• Apply a spot of clean engine oil to the top 
of the rotor spindle (2). 
• Fit the rotor arm and distributor cap, 
ensuring that they are properly located. 
Secure the distributor cap with the two 
clips.  
						

							Workshop maintenance 
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. 
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Before checking or adjusting any drive belt; 
to prevent the possibility of serious if!jury, 
disconnect the banery negative lead to 
prevent the engine from being started. 
142 
DRIVE BElT -300 Tdi engine 
The 300 Tdi engine uses a serpentine· type 
drive belt. which drives all the ancillaries 
except for the air conditioning compressor 
and 24 Volt alternator (if fitted). 
J642 
An automatic drive belt tensioner keeps the 
belt at the correct tension, thereby eliminating 
the need to manually check the belt deflection. 
Under normal highway use, the belt must be 
changed at 160,000 km (96,000 mile) or eight 
year intervals {whichever occurs first), but 
should be examined regularly for signs of 
wear, splitting or oil contamination and 
replaced accordingly.  
						

							Workshop maintenance 
AlTERNATOR DRIVE BELT 
VB 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 adjustment bolt (3). 
• Tighten the LOWER adjustment bolt (3). 
• Tighten both bolts (2}. 
• Connect the battery, run the engine for five 
minutes at a fast idle and then switch off. 
• Re-check belt tension. 
143 
VB engine (with air-conditioning) 
Check the belt deflection with thumb pressure, 
mid-way between the steering pump and 
alternator pulleys (arrowed (1) in illustration). 
Movement should be between 4 and 6 mm 
(0.16 and 0.25 in). If adjustment is necessary; 
• Tum the starter switch to position ·a· and 
disconnect the battery negative lead. 
• Slacken the adjustment link clamp and 
pivot bolts (2}. 
• Slacken the two alternator pivot bolts (3). 
• Move the alternator towards, or away from 
the engine to decrease, or increase 
tension.  
						

							Workshop maintenance 
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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. 
144  
						

							Workshop maintenance 
POWER STEERING PUMP DRIVE BELT 
VB 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: 
• Tum the starter switch to position ·a· 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 tension. 
145 
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DO NOT lever, or apply pressure to the pump 
body to tension the belt, as damage to the 
pump may occur. 
• Tighten adjustment clamp bolt (3). 
• Tighten the two pivot bolts (2). 
• Connect the battery, run the engine for five 
minutes at a fast idle and then switch off. 
• Re-check belt tension.  
						

							Workshop maintenance 
POWER STEERING PUMP DRIVE BELT 
VB 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 -VB engine with 
air -conditioning). 
• Slacken the steering pump adjustment 
clamp bolt {3). 
146 
• Slacken the two steering pump pivot bolts 
(4). 
• Move the steering pump in the required 
direction to achieve the correct tension. 
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DO NOT lever,  or apply pressure to the pump 
body to tension the belt, as damage to the 
pump may occur. 
• Tighten the pump adjustment clamp bolt 
{3). 
• Tighten the two pump pivot bolts (4). 
• Adjust the alternator drive belt (see 
Alternator drive belt-VB engine with 
air-conditioning). 
• Connect the battery, run the engine for five 
minutes at a fast idle and then switch off. 
• Re-check both steering pump and 
alternator belt tension.  
						

							Workshop maintenance 
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. 
147  
						

							Workshop maintenance 
AIR CONDITIONING COMPRESSOR 
DRIVE BELT 
VB engine 
Check the belt deflection with thumb pressure, 
mid-way between the compressor and 
fan/water pump pulley. Movement should be 
approximately 4 mm to 6 mm (0.16 to 0.25 
in). If adjustment is necessary; 
J640. 
• Turn the starter switch to position ·o· and 
disconnect the battery negative lead. 
• Slacken the two compressor mounting 
bracket clamp bolts (3). 
• Slacken the pivot bolt (4) in the centre of 
the bracket. 
• Move the compressor towards/away from 
the engine, to decrease/increase the 
tension as required. 
148 
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DO NOT lever, or apply pressure to the 
compressor, as this  could cause permanent 
damage. 
• Tighten the clamp bolts (3). 
• Tighten the pivot bolt (4). 
• Check tension. 
• Connect the battery, run the engine for five 
minutes at a fast idle and then switch off. 
• Re-check the belt tension.