GENERAL INFORMATION 0A–31
Condition Possible Cause Correction
Engine knocking
Gas leakage noise
Continuous noise
Slapping noise
Use of wrong fuel
Fuel injection timing improperly
adjusted
Improper injection nozzle starting
pressure
Improper spray condition
Broken piston ring resulting in low
compression pressure
Defective fuel injection nozzle resulting
in fuel drippage after fuel injection
Loosely connected exhaust pipes
Broken exhaust pipes
Loose injection nozzles and/or glow
plugs
Loosely connected exhaust manifold
Damaged cylinder head gasket
Loose fan belt
Loose cooling fan
Worn or damaged water pump bearing
Worn or damaged alternator bearing
Valve clearance improperly adjusted
Valve clearance improperly adjusted
Damaged rocker arm
Worn or damaged crankshaft and/or
thrust bearings
Worn or damaged crankshaft and/or
connecting rod bearings
Worn or damaged connecting rod
bushing and piston pin
Worn or damaged piston and cylinder
liner
Foreign material in the cylinder
Use correct fuel
Adjust the injection timing
Adjust or replace the injection nozzle
Replace the piston ring
Replace the fuel injection nozzle
Tighten the exhaust pipe connections
Replace the exhaust pipes
Tighten the injection nozzles and/or
glow plugs
Replace the washers
Tighten the exhaust manifold
connections
Replace the cylinder head gasket
Readjust the belt tension
Retighten cooling fan
Replace the water pump bearing
Replace the alternator bearing
Adjust the valve clearance
Adjust the valve clearance
Replace the rocker arm
Replace the crankshaft and/or thrust
bearings
Replace the crankshaft and/or
connecting rod bearings
Replace the connecting rod bushing
and/or piston pin
Replace the piston and cylinder liner
10. Abnormal Engine Noise
Start the engine and allow it to warm up before beginning the troubleshooting procedure.
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