Isuzu 4JA1 Workshop Manual page 182

6B – 20 ENGINE COOLING
Make necessary correction or parts replacement if wear, damage or any other abnormal condition are found through
inspection.
Illustration
FAN CLUTCH WITH COOLING FAN
INSPECTION AND REPAIR
033R300001
033RY00011
SPECIAL TOOLS
Tool Number
5-8840-0277-0
5-8840-2663-0
Visually inspect for damage, leak (sillicon grease) or other
abnormal conditions.
1. Inspection (on-vehicle)
1) Turn the fan clutch by hand when in a low temperature
condition before starting the engine, and confirm that it
can be turned readily.
2) Start the engine to warm it up until the temperature at
the fan clutch portion gets to around 80°C (176°F).
Then stop the engine and confirm that the fan clutch
can be turned with considerable effort (clutch torque)
when turned by hand.
If the fan clutch rotates more readily, however, this
indicates that the silicone grease is leaking internally.
Replace the fan clutch with a new one.
2. Inspection (in unit)
Warm up the bimetal of the fan clutch by using the heat
gun until the temperature gets to about 80°C (176°F) when
measured with the thermistor. Then confirm that the fan
clutch can be turned with considerable effort (clutch
torque).
If the fan clutch retates more readily at this time, this
indicates that the silicone grease is leaking internally.
Replace the fan clutch with a new one.
Cap tester
Adapter
Tool Name