Cummins/Onan — Water Pump 131-0165 Disassembly

Repair & overhaul

From a Cummins/Onan service manual — check it applies to your exact model before use.

Applies to: Cummins/Onan MCCK

Procedure

1. Remove the pump end plate screws, end plate, and gasket.
2. Pull out neoprene impeller with a pair of pliers.
3. If further disassembly required, disconnect hoses and remove two capscrews holding pump to engine; lift pump from engine.
4. Loosen set screw on side of pump and tap lightly to free cam from pump body; lift out cam and wear plate.
5. Remove retaining ring using a screwdriver and slide the seat assembly (O-ring and ceramic seal) off the pump shaft.
6. Pry the bellows assembly out of the pump body through the drain slots.
7. Drive the shaft and bearing assembly out of the pump body using a bearing driver or press.

Full service-parts list: Cummins/Onan MCCK →

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.

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