Cummins/Onan MJA, MJB, MJC — Water Pump Assembly

For the Cummins/Onan MJA, MJB, MJC.

Applies to: Cummins Onan Mjc

Procedure

1. Before beginning assembly, clean all old Permatex from the inside surfaces of the pump body and from the cam and wear plate.
2. Install both seals in the body with lips pointing in opposite directions.
3. Drop the wear plate in the body with tanged side out.
4. Permatex top surface and back face of cam and install with cam screw. Permatex the screw threads and line up the hole in the cam with the tang on the wear plate.
5. Install the shaft and impeller assembly.
6. Install the gasket and end cover with screws.

Source: manual:968-0500 Onan MJA MJB MJC Service Manual (10-1964).pdf. Figures and steps are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.