Water Pump - Inspect - Perkins 1104D NH1 Systems Operation Testing And Adjusting

68
Testing and Adjusting Section
5. After ten minutes, remove the water temperature
regulator. Immediately measure the opening
of the water temperature regulator. Refer to
Specifications, "Water Temperature Regulator"
for the minimum opening distance of the
water temperature regulator at the fully open
temperature.
If the distance is less than the amount listed in the
manual, replace the water temperature regulator.

Water Pump - Inspect

1. Inspect the water pump for leaks at vent hole. The
water pump seal is lubricated by coolant in the
cooling system. It is normal for a small amount of
leakage to occur as the engine cools down and
the parts contract.
2. Refer to Disassembly and Assembly, "Water Pump
- Remove " and Disassembly and Assembly,
"Water Pump - Install".
3. Inspect the water pump shaft for unusual noise,
excessive looseness and/or vibration of the
bearings.
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