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TROUBLESHOOTING
Possible causes
Cylinder head and valve
mechanism
Timing gears
Camshaft
Pistons and connecting
rods
Crankshaft
Fuel system
Cooling system
Intake and exhaust
system
Oil viscosity unsuitable
Improper fuel
Incorrectly fitted piping and hoses
Defective/incorrectly fitted alternator and other auxiliaries
11-12
Valve clearance incorrect
Defective cylinder head gasket
Valve and valve seat worn and carbon deposits
Valve spring fatigued
Defective rocker shaft and bracket
Poor lubrication of rocker shaft and bracket assembly
Defective backlash between gears
Poor lubrication of gearts and idler shaft
Camshaft end play excessive
Camshaft worn
Piston ring groove(s) worn and damaged
Piston ring(s) worn and damaged
Piston pin and connecting rod small end worn
Crankshaft end play excessive
Fan pulley improperly mounted
Crankshaft pins and connecting rod bearings worn or
damaged
Crankshaft journals and main bearings worn or damaged
Defective supply pump
Defective injector
Air trapped in fuel system
Cooling system malfunction
Belts loose/damaged
Air cleaner colgged
Turbocharger malfunction
Diesel particulate filter colgged
Symptoms
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
Gr13
O
O
Gr14
O
O
O
Gr15
O
O
O
O Gr15
O
Gr12
O
O
O Gr54
Reference Gr
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Table of Contents
Troubleshooting
