Isuzu engine 4j series. Manual — part 2
SERVICE INFORMATION 00 – 7
Checkpoint
Possible cause
Correction
Injection timing improperly adjusted
Adjust the injection timing
Insufficient injection volume
Adjust the injection volume
Defective idle spring
Replace the idle spring
Defective governor lever operation
Repair or replace the governor lever
Regulator valve improperly adjustment
Adjust or replace the regulator valve
Broken plunger spring
Replace the plunger spring
Worn plunger
Replace the plunger assembly
Injection pump
(Cont’d)
Worn cam disc
Replace the cam disc
Valve clearance
Valve clearance improperly adjusted
Adjust the valve clearance
Compression pressure
Blown out cylinder head gasket. Worn
cylinder liner.
Piston ring sticking
Replace the related parts
3. INSUFFICIENT POWER
Checkpoint
Possible cause
Correction
Air cleaner
Clogged air cleaner element
Clean or replace the air cleaner
element
Fuel
Water particle in the fuel
Replace fuel
Fuel filter
Clogged fuel filter element
Replace the fuel filter element or the
fuel filter cartridge
Fuel feed pump
Defective fuel feed pump
Repair or replace the fuel feed pump
Injection nozzle sticking
Replace the injection nozzle
Injection nozzle
Injection nozzle injection starting pressure
too low
Improper spray condition
Adjust or replace the injection nozzle
Fuel injection pipes
Fuel injection pipes damaged or obstructed
Replace the fuel injection pipes
00 – 8
SERVICE INFORMATION
Checkpoint
Possible cause
Correction
Defective regulating valve
Repair or replace the regulating valve
Defective delivery valve
Replace the delivery valve
Defective timer
Repair or replace the timer
Worn cam disc
Replace the cam disc
Improper control lever operation
Adjust or replace the control lever
Defective injection timing
Adjust the injection timing
Repair or replace the injection pump
timer
Weak governor spring
Replace the governor spring
Injection pump
Worn plunger
Replace the plunger assembly
Compression pressure
Blown out cylinder head gasket. Worn
cylinder liner.
Piston ring sticking
Replace the related parts
Valve clearance
Valve clearance improperly adjusted
Adjust the valve clearance
Valve spring
Valve spring weak or broken
Replace the valve spring
Exhaust system
Exhaust pipe clogged
Clean the exhaust pipe
Full load adjusting
screw seal
Open and improperly set adjusting screw
seal
Adjust and reseal the adjusting screw
SERVICE INFORMATION 00 – 9
4. EXCESSIVE FUEL CONSUMPTION
Checkpoint
Possible cause
Correction
Fuel 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 speed
Poorly adjusted idling speed
Adjust the idling speed
Injection nozzle
Injection nozzle injection starting pressure
too low
Improper spray condition
Adjust or replace the injection nozzle
Fuel injection timing
Fuel injection timing improperly
Adjust the fuel injection timing
Injection pump
Defective Delivery valve resulting is fuel
drippage after fuel injection
Replace the delivery valve
Valve clearance
Valve clearance improperly adjusted
Adjust the valve clearance
Compression pressure
Blown out cylinder head gasket. Worn
cylinder liner.
Piston ring sticking
Replace the related parts
Valve spring
Valve spring weak or broken
Replace the valve spring
5. EXCESSIVE OIL CONSUMPTION
Checkpoint
Possible cause
Correction
Engine oil
Engine oil unsuitable
Too much engine oil
Replace the engine oil
Correct the engine oil level
Oil 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
Intake and exhaust
valve
Worn valve stems and valve guides
Replace the intake and exhaust
valves and the valve guides
00 – 10
SERVICE INFORMATION
6. OVERHEATING
Checkpoint
Possible cause
Correction
Cooling water
Insufficient cooling water
Replenish the cooling water
Fan clutch
Oil leakage from the fan clutch
Replace the fan clutch
Fan belt
Fan belt loose or cracked causing slippage
Replace the fan belt
Radiator
Defective radiator cap or clogged radiator
core
Replace the radiator cap or clean the
radiator core
Water pump
Defective water pump
Repair or replace the water pump
Cylinder head and
cylinder body sealing
cap
Defective sealing cap resulting in water
leakage
Replace the sealing cap
Thermostat
Defective thermostat
Replace the thermostat
Cooling system
Cooling system clogged by foreign material
Clean the foreign material from the
cooling system
Fuel injection timing
Fuel injection timing improperly adjusted
Adjust the fuel injection timing
7. WHITE EXHAUST SMOKE
Checkpoint
Possible cause
Correction
Cooling water
Insufficient cooling water
Replace the cooling water
Fuel
Water particles in the fuel
Replace the fuel
Fuel injection timing
Delayed fuel injection timing
Adjust the fuel injection timing
Compression pressure
Blown out cylinder head gasket. Worn
cylinder liner.
Piston ring sticking
Replace the related parts
Inlet and exhaust valve
Valves seals
Defective valve seals.
Worn valves stems and valve guides
Replace the valve seals, the valves,
and the valve guides
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