00 Ð 12 SERVICE INFORMATION
10. ABNORMAL ENGINE NOISE
Checkpoint Possible cause Correction
Fuel Fuel unsuitable Replace the fuel
1. ENGINE KNOCKING
2. GAS LEAKAGE NOISE
Exhaust pipes Loosely connected exhaust pipes. Broken
exhaust pipesTighten the exhaust pipe
connections
Replace the exhaust pipes Check to see that the engine has been thoroughly warmed up before begining the troubleshooting
procedure.
Fuel injection timing Fuel injection timing improperly adjusted Adjust the fuel injection timing
Injection nozzle Improper injection nozzle starting pressure
and spray conditionAdjust or replace the injection
nozzle
Compression
pressureBlown out head gasket
Broken piston ringReplace the head gasket or the
piston ring
Injection nozzles
and/or glow plugsLoose injection nozzles and/or glow plugs Replace the washers
Tighten the injection nozzles and/or
the glow plugs
Exhaust manifold Loosely connected exhaust manifold and/or
glow plugsTighten the exhaust manifold
connections
Cylinder head gasket Damaged cylinder head gasket Replace the cylinder head gasket
3. CONTINUOUS NOISE
Fan belt Loose fan belt Readjust the fan belt tension
Cooling fan Loose coling fan Retighten the cooling fan
Water pump bearing Worn or damaged water pump bearing Replace the water pump bearing
Alternator or vacuum
pumpDefective alternator or vacuum pump Repair or replace the alternator or
the vacuum pump
Valve clearance Clearance improperly adjust Adjust the valve clearance
00 Ð 32 SERVICE INFORMATION
Drive Belt Adjustment
Check the drive belt tension.
Depress the drive belt mid-portion with a 98N (10kg/22 lb)
force.
Cooling Fan Pulley Drive Belt
Fan belt tension is adjusted by moving the alternator.
Depress the drive belt mid-portion with a 98N (10Kg/22lb)
force.
1Crankshaft damper pulley
2Alternator pulley
3Cooling fan pulley
Compressor Pulley Drive Belt
Move the idler pulley as required to adjust the compressor
drive belt tension.
If the vehicle is equipped with power steering, move the oil
pump as required.
Depress the drive belt mid-portion with a 98N (10Kg/22lb)
force.
1Crankshaft damper pulley
2Oil pump pulley or idler pulley
3Compressor pulley
Power Steering Oil Pump Pulley Drive Belt
Move the oil pump as required to adjust the oil pump drive
belt tension.
On air conditioner equipped models, both drive belts pulley
must always be replaced as a set.
Depress the drive mid-portion with a 98N (10kg/22 lb) force.
1Crankshaft damper pulley
2Oil pump pulley
3Compressor pulley or idler pulley Check the drive belt for cracking and other damage.
1Crankshaft damper pulley.
2Alternator pulley
3Cooling fan pulley
4Oil pump pulley or idler pulley
5Compressor pulley or idler pulley
10 (0.39)
mm(in) Drive Belt Deflection
