Isuzu engine 4j series. Service manual - part 3
SERVICE INFORMATION 00 – 11
8. DARK EXHAUST SMOKE
Checkpoint
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
Defective delivery valve resulting in fuel
drippage after fuel injection
Replace the delivery valve
Injection pump
Excessive injection volume
Adjust the injection volume
9. OIL PRESSURE DOES NOT RISE
Checkpoint
Possible cause
Correction
Engine oil
Improper viscosity engine oil.
Insufficient engine oil
Replace the 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
Clogged oil pump strainer
Clean the oil pump strainer
Oil pump
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
bearings
Worn crankshaft and bearings
Replace the crankshaft and/or the
bearings