15
15-9
Symptoms
Engine hard to start
Black exhaust gas
White exhaust gas
Poor engine power
Excess oil consumption
Abnormal noise or vibration in intake/exhaust
system
Reference Gr
Possible causes
Air cleaner Clogged air cleaner element O O O O
Turbocharger
Cartridge assembly
Defective bearing O O O
Carbon deposits on shaft and turbine wheel
unit
OO
Interference between shaft and turbine
wheel unit and turbine back plate
OO O
Interference between shaft and turbine
wheel unit and turbine housing
OO O
Bent shaft and turbine wheel unit O O O
Damaged shaft and turbine wheel unit O O O
Interference between compressor wheel
and compressor cover
OO O
Seized thrust sleeve and/or thrust bearing O O O
Damaged compressor wheel O O O
Oil leakage due to worn piston ring and/or
insert
OO O
Piston ring fitted poorly O
Defective sliding action between parts due
to clogged lubrication oil pipe and eyebolt
OO O
Oil seals damaged due to clogged oil return
pipe
OO
Compressor cover fitted poorly O O O O
Turbine housing fitted poorly O O
Intercooler
Foreign substances deposited on intercooler front
core
O
Front pipe/DPF/tail pipe deformed O O
Front pipe/DPF/tail pipe fitted poorly O O
Incorrect valve clearances O
Gr11
Head gasket defective O
Wear/carbon deposits on valves and valve seats O
Valve spring weakened O
Piston rings worn/damaged O O
Piston ring grooves worn/damaged O O
Cooling system malfunctioning O Gr14
Engine oil quantity excessive O Gr12
Major moving parts seized O O Gr11
Uneven or excessive fuel injection O Gr13
TROUBLESHOOTING
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