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 |
|---|---|---|
| 012046 | Air Cleaner | air_filter |
| 012040 | Battery | battery |
| 012041 | Fan Belt | belt |
| 012045 | Coolant Overflow Reservoir | coolant_filter |
| 2.4L | Engine | engine |
| 012044 | Oil Drain Hose | fluid |
| 012042 | Oil Filter | oil_filter |
| 012043 | Oil Fill Cap | oil_filter |
| 0L2090-C | 60 kW (2.4 L) | other_service |
Parts cataloged across all variants of this engine family — verify the exact part fits your specific variant and serial number before ordering.