The Cummins/Onan 4BTA3.9 engine line groups 5 variant designations. Parts and fitment are pooled here so a cross-reference found on one variant surfaces for the whole family.
| Part # | Description | Category |
|---|---|---|
| 2.4L | Engine | engine |
| 285542 | Gasket. manifold | gasket |
| 265484 | Line. flex. fuel, 41" | hose |
| 266110 | Line, flex. fuel, 50” | hose |
| 271500 | Line. flex. fuel, 22” | hose |
| 285498 | Hose, molded | hose |
| 285722 | Hose, upper molded | hose |
| 285957 | Line. flex. fuel. 18” | hose |
| X-797-2 | Line, fuel | hose |
| A046K020 | Oil Filter | oil_filter |
| 0L2090-C | 60 kW (2.4 L) | other_service |
| A-290538 | Block heater | other_service |
| A-290885 | Heater, block (240V) | other_service |
| 240976 | Switch, high temperature 268298 Sender, temperature | sensor |
| 241481 | Switch, high temperature 268298 Sender, water temperature | sensor |
| 268298 | Sender, water temperature gauge | sensor |
| 290090 | Switch, low water temperature | sensor |
Parts cataloged across all variants of this engine family — verify the exact part fits your specific variant and serial number before ordering.
This engine family also powers 7 generator set(s) on Facts About Generators.