Cummins/Onan — Cylinder Block - Hone or Bore

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

1. Disconnect and connect choke cable, governor linkage, electrical wiring
2. Remove and install housings, flywheel and stator, intake manifold, exhaust manifold
3. Remove and install cylinder head, oil filter and adapter, oil base, gearcase cover
4. Remove and install piston and piston rings, connecting rod, crankshaft, camshaft
5. Remove and install valve assembly, tappets, bearings, oil seals, oil pump
6. Hone or bore cylinder
7. Install new piston and rings, new connecting rod, new bearings
8. Adjust valve lash
9. Test run unit

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.

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