Cummins/Onan — Engine - Rebuild (Gas Engine)
Repair & overhaul
From a Cummins/Onan service manual covering: E124V, E125, E140. Check it applies to your exact model before use.
Applies to: Onan Corporation (Cummins Power Generation) E124V, Onan Corporation (Cummins Power Generation) E140
Procedure
- Drain crankcase oil
- Disconnect and connect choke cable, governor linkage, electrical wiring
- Remove and install housings, muffler, air cleaner assembly, carburetor, air deflector
- Remove and install ignition module, flywheel and stator, oil filter, starter
- Remove and install intake manifold, exhaust manifold, spark plug, valve cover
- Remove and install cylinder head, oil base, balance shaft assembly
- Remove and install connecting rod and piston, crankshaft, camshaft, tappets
- Remove and install bearings, oil seals, oil pump
- Hone or bore cylinder
- Test run engine
Full service-parts list: Onan Corporation (Cummins Power Generation) E124V →, Onan Corporation (Cummins Power Generation) E140 →
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.