Cummins/Onan — Removing and Reinstalling the Engine/PMA Assembly
Repair & overhaul
From a Cummins/Onan service manual — check it applies to your exact model before use.
Applies to: Cummins/Onan HDZAA
Before you start
- See Engine Workshop Manual 983-0504 for servicing the engine.
Procedure
- Disconnect the DC cables; disconnect the fuel lines; remove the outer housing; remove the muffler; disconnect the AC wiring harnesses.
- Remove the inner housing assembly.
- Remove the Engine/PMA assembly from the four vibration isolator mounts.
- Reassembly: tighten the engine mounting bracket bolts (to engine) to 14 ft-lbs (19 N-m).
- Tighten the engine mounting isolator bolts (to generator set base) to 10 ft-lbs (14 N-m).
- Remount the muffler and reconnect the fuel lines.
- Tighten the engine harness connector screws to 10.6 in-lbs (1.2 N-m) and the housing screws to 27 in-lbs (3 N-m).
Specs & values
- Engine mounting bracket bolts 14 ft-lbs (19 N-m)
- Engine mounting isolator bolts 10 ft-lbs (14 N-m)
- Engine harness connector screws 10.6 in-lbs (1.2 N-m)
- Housing screws 27 in-lbs (3 N-m)
Full service-parts list: Cummins/Onan HDZAA →
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.