Isuzu A-4JA1 Workshop Manual page 190

Checkpoint
Continued from the previous page
OK
Turbocharger
OK
Compression pressure
OK
Valve clearance
OK
Valve spring
OK
Exhaust system
OK
Full load adjusting screw seal
3. INSUFFICIENT POWER
Trouble Cause
NG
Defective turbocharger assembly
Blown out cylinder head gasket
Worn cylinder liner
NG
Piston ring sticking or broken
Improper seating between the
valve and the valve seat
NG Valve clearance improperly
adjusted
NG
Valve spring weak or broken
NG
Exhaust pipe clogged
Open and improperly set
NG
adjusting screw seal
TROUBLESHOOTING
Countermeasure
NG
Replace the turbocharger assembly
NG
Replace the related parts
NG
Adjust the valve clearance
NG
Replace the valve spring
NG
Clean the exhaust pipe
Adjust and reseal the adjusting
NG
screw
187