Isuzu N-Series. Manual — part 299
00-8 SERVICE INFORMATION
Unstable Idling
Check point
Possible cause
Correction
Idling system
Idling improperly adjusted
Adjust the idling
Fast idling speed con-
trol device
Defective fast idling speed control device
Repair or replace the fast idling speed
control device
Accelerator control
system
Accelerator control system improperly
adjusted
Adjust the accelerator control system
Fuel system
Fuel system leakage or blockage
Repair or replace the fuel system
Air in the fuel system
Bleed the air from the fuel system
Water particles in the fuel system
Change the 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
Injection nozzle sticking
Replace the injection nozzle
Injection nozzle injection starting pressure
too low
Improper spray condition
Adjust or replace the injection nozzle
Injection pump
Defective delivery valve resulting in fuel
drippage after fuel injection
Replace the delivery valve
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
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 between the valve and
the valve seat
Replace the related parts
SERVICE INFORMATION 00-9
Insufficient Power
Check point
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
Injection nozzle sticking
Replace the 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
Injection pump
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 disk
Replace the cam disk
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
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
00-10 SERVICE INFORMATION
Excessive Fuel Consumption
Excessive Oil Consumption
Overheating
Check point
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
Check point
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
Check point
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 radi-
ator core
Water pump
Defective water pump
Repair or replace the water pump
Cylinder head and cyl-
inder 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 mate-
rial
Clean the foreign material from the cooling
system
Fuel injection timing
Fuel injection timing improperly adjusted
Adjust the fuel injection timing
SERVICE INFORMATION 00-11
White Exhaust Smoke
Dark Exhaust Smoke
Oil Pressure Does Not Rise
Check point
Possible cause
Correction
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
valves
Valves seals
Defective valve seales
Worn valves stems and valve guides
Replace the valve seales, the valves, and
the valve guides
Check point
Possible cause
Correction
Air cleaner
Clogged air cleaner element
Clean or replace the air cleaner element
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 adjusted
Adjust the fuel injection timing
Injection pump
Defective delivery valve resulting in fuel
drippage after fuel injection
Replace the delivery valve
Excessive injection volume
Adjust the injection volume
Check point
Possible cause
Correction
Engine oil
Improper viscosity engine oil
Replace the engine oil
Insufficient engine oil
Correct the engine oil volume
Oil pressure gauge or
unit
Oil pressure indicator
light
Defective oil pressure gauge or unit
Defective indicator light
Repair or replace the oil pressure gauge or
unit
Replace the indicator light
Oil filter
Clogged oil filter element
Replace the oil filter element or the oil filter
cartridge
Relief valve and by-
pass valve
Relief valve sticking and/or weak by-pass
valve spring
Replace the relief valve and/or the by-pass
valve spring
Oil pump
Clogged oil pump strainer
Clean the oil pump strainer
Worn oil pump related parts
Replace the oil pump related parts
Rocker arm shaft
Worn rocker arm bushing
Replace the rocker arm bushing
Camshaft
Worn camshaft and camshaft bearing
Replace the camshaft and the camshaft
bearing
Crankshaft and bear-
ings
Worn crankshaft and bearings
Replace the crankshaft and/or the bear-
ings
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