Isuzu 4JB1 User Manual

00 – 8 SERVICE INF
ORMATION
Checkpoint Possible cause Correction
Def
ective regulating valve Repair or replace the regulating valve
Def
ective delivery valve Replace the delivery valve
Def
ective timer Repair or replace the timer
W
orn cam disc Replace the cam disc
Im
proper control lever operation Adjust or replace the control lever
Def
ective injection timing Adjust the injection timing
Repair or replace the injection pump
timer
W
eak governor spring Replace the governor spring
Inj
ection pump
Worn plunger Replace the plunger assembly
Com
pression pressure Blown out cylinder head gasket. Worn
cylinder liner.
Piston ring sticking
Replace the related parts
Valve c
learance Valve clearance improperly adjusted Adjust the valve clearance
Valve s
pring Valve spring weak or broken Replace the valve spring
Ex
haust system Exhaust pipe clogged Clean the exhaust pipe
F
ull load adjusting
screw seal
Open and improperly set adjusting screw
seal
Adjust and reseal the adjusting screw

Isuzu 4JB1 Specifications

General

Brand	Isuzu
Model	4JB1
Category	Engine
Language	English