Cummins/Onan — Water Pump 131-0165 Assembly
Repair & overhaul
From a Cummins/Onan service manual — check it applies to your exact model before use.
Applies to: Cummins/Onan MCCK
Procedure
- Apply sealing compound to the sealing lip around the edge of the bellows seal; place bellows seal in pump body and drive into place.
- Apply a small amount of Loctite or equivalent on the outside surface of the bearing.
- Place bearing and shaft assembly in pump bore and drive into place; strike outer race only.
- Lubricate both sides of seat assembly with oil and slide over pump shaft; ceramic portion contacts bellows. Compress seat against bellows and push retaining ring into groove on shaft.
- Place wear plate and cam so notch in wear plate lines up with tank on cam; fasten cam to housing with screw.
- Align flat spot in center of impeller with flat spot on pump shaft; bend back impeller blades nearest cam and push impeller onto shaft.
- Install pump end plate using a new gasket and tighten end plate screws to 15-17 in-lb (1.7-1.9 Nm).
- Install pump on engine and attach hoses.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- End plate screws 15-17 in-lb (1.7-1.9 Nm)
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.