00 – 12 SERVICE INFORMATION
10. ABNORMAL ENGINE NOISE
1. ENGINE KNOCKING
Check to see that the engine has been thoroughly warmed up before beginning the troubleshooting procedure.
Checkpoint Possible cause Correction
Fuel Fuel unsuitable Replace the fuel
Fuel injection timing Fuel injection timing improperly adjusted Adjust the fuel injection timing
Injection nozzle Improper injection nozzle starting pressure
and spray condition
Adjust or replace the injection nozzle
Compression pressure Blown out head gasket
Broken piston ring
Replace the head gasket or the piston
ring
2. GAS LEAKAGE NOISE
Exhaust pipes Loosely connected exhaust pipes. Broken
exhaust pipes
Tighten the exhaust pipe connections
Replace the exhaust pipes
Injection nozzles
and/or glow plugs
Loose 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 plugs
Tighten 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 cooling fan Retighten the cooling fan
Water pump bearing Worn or damaged water pump bearing Replace the water pump bearing
Generator or vacuum
pump
Defective generator or vacuum pump Repair or replace the generator or the
vacuum pump
Valve clearance Clearance improperly adjust Adjust the valve clearances
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