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TROUBLESHOOTING
Possible causes
Air cleaner
Turbocharger
Compressor cover fitted poorly
Turbine housing fitted poorly
Incorrect valve clearances
Head gasket defective
Wear/carbon deposits on valves and valve seats
Valve spring weakened
Piston rings worn/damaged
Piston ring grooves worn/damaged
Cooling system malfunctioning
Engine oil quantity excessive
Major moving parts seized
Uneven or excessive fuel injection
Clogged air cleaner element
Carbon deposits on shaft
Interference between turbine wheel and tur-
bine housing
Bent shaft
Damaged turbine wheel unit
Interference between compressor wheel
and compressor cover
Damaged compressor wheel
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
O
15
Reference Gr
O
O
O
O
O
O
O
O
Gr11
O
O
Gr14
Gr12
Gr11
Gr13E
15-5
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Table of Contents
Troubleshooting
