Isuzu 4JB1 User Manual

SERVICE INFORM
ATION 00 – 9
4. EXCESSIVE FUEL CONSUM
PTION
Checkpoint Possible cause Correction
F
uel system Fuel leakage Repair or replace the fuel system
related parts
Air
cleaner Clogged air cleaner element Clean or replace the air cleaner
element
Idling s
peed Poorly adjusted idling speed Adjust the idling speed
Inj
ection nozzle Injection nozzle injection starting pressure
too low
Improper spray condition
Adjust or replace the injection nozzle
F
uel injection timing Fuel injection timing improperly Adjust the fuel injection timing
Inj
ection pump Defective Delivery valve resulting is fuel
drippage after fuel injection
Replace the delivery valve
Valve c
learance Valve clearance improperly adjusted Adjust the valve clearance
Com
pression pressure Blown out cylinder head gasket. Worn
cylinder liner.
Piston ring sticking
Replace the related parts
Valve s
pring Valve spring weak or broken Replace the valve spring
5. EXCESSIVE OIL CONSUM
PTION
Checkpoint Possible cause Correction
Engine oil
Engine oil unsuitable
Too much engine oil
Replace the engine oil
Correct the engine oil level
O
il seal and gasket Oil leakage from the oil seal and/or the
gasket
Replace the oil seal and/or the gasket
Air
breather Clogged air breather Clean the air breather
Intak
e and exhaust
valve
Worn valve stems and valve guides Replace the intake and exhaust
valves and the valve guides

Isuzu 4JB1 Specifications

General

Brand	Isuzu
Model	4JB1
Category	Engine
Language	English