Perkins 1106A-70T Operation And Maintenance Manual page 87

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Maintenance Recommendations
Water Pump - Inspect
Note: The water pump seal is lubricated by the
coolant in the cooling system. It is normal for a small
amount of leakage to occur as the engine cools down
and parts contract.
Visually inspect the water pump for leaks.
Note: If engine coolant enters the engine lubricating
system the lubricating oil and the engine oil filter must
be replaced. This will remove any contamination that
is caused by the coolant and this will prevent any
irregular oil samples.
The water pump is not a serviceable item. In order to
install a new water pump, refer to the Disassembly
and Assembly Manual, "Water Pump - Remove and
Install".