Excessive Oil Consumption - Isuzu A-4JA1 Workshop Manual

TROUBLESHOOTING
Checkpoint
Engine oil
OK
Oil seal and gasket
OK
Air breather
OK
Inlet and exhaust valves
Valve seals
OK
Piston rings
OK
Cylinder liners
190
5.

EXCESSIVE OIL CONSUMPTION

Trouble Cause
NG Engine oil unsuitable
Too much engine oil
NG Oil leakage from the oil seal
and/or the gasket
NG
Clogged air breather
Defective valve seals
NG
Worn valves stems and valve
guides
Piston rings worn, broken or
NG
improperly installed
NG Cylinder lines scored or
worn
Countermeasure
NG Replace the engine oil
Correct the engine oil volume
NG Replace the oil seal and/or the
gasket
NG
Clean the air breather
Replace the valve seals, the
NG
valves, and the valve guides
Replace the piston rings or
NG
properly install
NG
Replace the cylinder liners