Cummins/Onan — Water pump removal and installation (centrifugal)
Repair & overhaul
From a Cummins/Onan service manual — check it applies to your exact model before use.
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Before you start
- Contact with hot coolant might result in serious burns. Allow cooling system to cool before releasing pressure.
Procedure
- Drain cooling system at radiator and engine block.
- Remove housing from radiator as necessary.
- Disconnect both hoses from radiator and remove radiator.
- Loosen fan belt; remove fan and water pump pulley.
- Disconnect bypass line and radiator lower hose from pump.
- Remove water pump from water pump housing.
- Installation is the reverse of removal.
Source: Cummins/Onan service manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.