Isuzu 2000 Trooper Workshop Manual page 724

Condition
Engine overheating
Engine overcooling
Engine lacks compression
Others
Engine Noisy
Abnormal engine noise often consists of various noises
originating in rotating parts, sliding parts and other mov-
ing parts of the engine. It is, therefore, advisable to locate
the source of noise systematically.
Condition
Noise from crank journals or from
crank bearings
(Faulty crank journals and crank y j
bearings usually make dull noise that
becomes more evident
accelerating)
Possible cause
Level of Engine Coolant too low
Fan clutch defective
Incorrect fan installed
Thermostat defective
Engine Coolant pump defective
Radiator clogged
Radiator filler cap defective
Level of oil in engine crankcase too
low or wrong engine oil
Resistance in
increased
Throttle Position Sensor adjustment
incorrect
Throttle Position Sensor circuit open
or shorted
Cylinder head gasket damaged
Thermostat defective
————
Tire inflation pressure abnormal
Brake drag
Clutch slipping
Level of oil in engine crankcase too
high
Exhaust Gas Recirculation Valve
defective
Possible cause
Oil clearance increased due to worn
crank journals or crank bearings
Crankshaft out of round
when
Crank bearing seized
ENGINE MECHANICAL
Replenish
Replace
Replace
Replace
Correct or replace
Clean or replace
Replace
Change or replenish
exhaust system Clean exhaust system or replace
defective parts
Replace with Throttle Valve ASM
Correct or replace
Replace
Replace (Use a thermostat set to
open at 82°C (180°F))
Refer to Hard Start
Adjust to recommended pressures
Adjust
Adjust or replace
Correct level of engine oil
Replace
Replace crank bearings and
crankshaft or regrind crankshaft and
install the undersize bearing
Replace crank bearings and
crankshaft or regrind crankshaft and
install the undersize bearing
Crank bearing seized. Replace crank
bearings and crankshaft or regrind
crankshaft and install the undersize
bearing
6A–11
Correction
Correction