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RJC — replacement.

For the RJC.

Procedure

  1. Disconnect pump outlet line and install pressure
  2. Test valves and diaphragm by operating priming lever
  3. Run engine with adequate ventilation at governed
  4. Remove pump inlet and outlet (Figure 18). Remove
  5. Notch pump cover and body with a file for assembly
  6. Lift out diaphragm assembly and diaphragm spring.

Tools required

  • gauge or manometer.
  • gauge (Figure 17).
  • between 2 and 3 psi with gauge held 16 inches above

Specs & torque values

  • between 2 and 3 psi with gauge held 16 inches above

Source: manual:967-0757_Onan_RJC_MJB_MJC_Gas_Engine_Service_Manual_11-1986.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.