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Home›Repair guides›Water Pump Assembly - Type 132-0146 and 132-0147

Compatible — Water Pump Assembly - Type 132-0146 and 132-0147

For these models: MDJA, MDJB, MDJC, MDJE, MDJF.

Before you start

  • Replace any worn components such as bearings, seal, seal seat, and impeller
  • Use a new end plate gasket when reassembling

Procedure

  1. Coat the shaft seal lip with grease
  2. Place the wear plate in the bottom of the impeller bore with the raised portion of the dimple facing up
  3. Coat the top of the cam and cam set screw threads with sealer
  4. Line up the dimple in the wear plate with the hole in the cam and then tighten the set screw
  5. Slide the impeller over the shaft and secure with the impeller pin
  6. Lubricate the shaft with grease and check shaft to make sure it is free of burrs
  7. Lubricate the impeller bore with grease and then install the shaft and impeller assembly using a twisting motion when fitting the impeller into the impeller bore
  8. Hold the new end cover gasket against the pump housing and install the end cover, securing it with three screws
  9. Mount the assembled pump on the engine and attach the hoses

Tools required

  • grease
  • twisting motion tool

Specs & torque values

  • new end plate gasket
  • worn bearings
  • seal
  • seal seat
  • impeller

Source: manual:974-0750_Onan_MDJA_to_MDJF_Marine_Diesel_Engine_Service_Manual_12-1985.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.