11-12
Symptoms
Low power output
Abnormal engine noise
Reference Gr
Possible causes
Cylinder head and valve
mechanism
Valve clearance incorrect O O
Defective cylinder head gasket O O
Valve and valve seat worn and carbon deposits O O
Valve spring fatigued O O
Defective rocker shaft and bracket O
Poor lubrication of rocker shaft and bracket assembly O
Timing gears
Defective backlash between gears O
Poor lubrication of gearts and idler shaft O
Camshaft
Camshaft end play excessive O
Camshaft worn O
Pistons and connecting
rods
Piston ring groove(s) worn and damaged O O
Piston ring(s) worn and damaged O O
Piston pin and connecting rod small end worn O
Crankshaft
Crankshaft end play excessive O
Fan pulley improperly mounted O
Crankshaft pins and connecting rod bearings worn or
damaged
O
Crankshaft journals and main bearings worn or damaged O
Fuel system
Defective supply pump O O
Gr13Defective injector O O
Air trapped in fuel system O
Cooling system
Cooling system malfunction O
Gr14
Belts loose/damaged O
Intake and exhaust
system
Air cleaner colgged O O
Gr15
Turbocharger malfunction O O
Diesel particulate filter colgged O O Gr15
Oil viscosity unsuitable O Gr12
Improper fuel O
Incorrectly fitted piping and hoses O
Defective/incorrectly fitted alternator and other auxiliaries O Gr54
TROUBLESHOOTING
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