The Cummins/Onan J120 engine line groups 2 variant designations. Parts and fitment are pooled here so a cross-reference found on one variant surfaces for the whole family.
| Part # | Description | Category |
|---|---|---|
| 420P268 | Wrench, Oil Filter - Box Type (For Purolator full flow filter) | oil_filter |
| 4208254 | Driver, Center Camshaft Bearing | other_service |
| 420A248 | Crankshaft Gear Pulling Ring | other_service |
| 420B270 | Driver, Valve Seat | other_service |
| 420B274 | Replacement Bits for 4208272 | other_service |
| 430A252 | Driver, Front Camshaft Bearing | other_service |
| 420B250 | Oil Seal Guide and Driver | seal |
| 420B272 | Valve Seat Remover | tool |
Parts cataloged across all variants of this engine family — verify the exact part fits your specific variant and serial number before ordering.