The Cummins/Onan ISM engine line groups 13 variant designations. Parts and fitment are pooled here so a cross-reference found on one variant surfaces for the whole family.
| Part # | Description | Category |
|---|---|---|
| 4089478 | Upper Engine Gasket Set | Gasket |
| 4089666 | EGR/Air Handling Gasket Set | Gasket |
| 205401 | Cup Plug | Service part / kit |
| 2863697 | Rocker Housing Capscrew | Service part / kit |
| 2864028 | Cylinder Liner Kit (6) | Service part / kit |
| 3016760 | Main Bearing Set | Service part / kit |
| 3016770 | Main Bearing Top | Service part / kit |
| 3016780 | Main Bearing Bottom | Service part / kit |
| 3403199RX | Cylinder Liner Kit (6) | Service part / kit |
| 3803703 | Connecting Rod Bearing (12) | Service part / kit |
| 4025125 | Main Bearing Top | Service part / kit |
| 4025158 | Engine Piston Kit (6) | Service part / kit |
| 4089386 | Thrust Bearing Top | Service part / kit |
| 4089388 | Connecting Rod Bearing | Service part / kit |
| 4318308 | Main Bearing Bottom Set | Service part / kit |
| 491878600 | Non-Articulated Piston Kit | Service part / kit |
| 491878700 | Articulated Piston Kit | Service part / kit |
| 4926017 | Thrust Bearing Top | Service part / kit |
| 4926018 | Thrust Bearing Bottom | Service part / kit |
| 4952453RX | Cylinder Liner Kit (6) | Service part / kit |
| 4999617 | Cylinder Liner Kit (6) | Service part / kit |
| CC2608 | Fleetguard Quik-Chek Coolant Quality Test Strips | Service part / kit |
| CC2609 | Fleetguard Water-Check H2O 3-Way Test Strips | Service part / kit |
| CC2806 | Fleetguard Refractometer | Service part / kit |
Parts cataloged across all variants of this engine family — verify the exact part fits your specific variant and serial number before ordering.