Isuzu KB P190. Manual - part 385
ENGINE COOLING (4JK1/4JJ1) 6B-17
Fan Clutch with Cooling Fan
Inspection and Repair
Make necessary correction or parts replacement if
wear, damage or any other abnormal conditions are
found through inspection.
Visually inspect for damage, leak (silicon grease) or
other abnormal conditions.
1. Inspection (on-vehicle)
a) Turn the fan clutch by hand when in a low
temperature condition before starting the
engine, and confirm that it can be turned
readily.
b) Start the engine to warm it up until the
temperature at the fan clutch portion gets to
around 85°C (185°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.
RTW56ASH025401
2. Inspection (in unit)
Warm up the bimetal of the fan clutch by using the
heat gun until the temperature gets to about 85°C
when measured with the thermistor. Then confirm
that the fan clutch can be turned with considerable
effort (clutch torque).
If the fan clutch rotates more readily at this time,
this indicates that the silicone grease is leaking
internally.
Replace the fan clutch with a new one.
033RY00011