Oil capacity: 104 L (109.9 US qt) (GTA855-G2). The Cummins/Onan GTA855 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.
| Variant | Displacement | Cylinders | Rated rpm | Oil capacity | Coolant |
|---|---|---|---|---|---|
| GTA855 | 14 L | 6 | 1,500 | — | — |
| GTA855-G1 | 14 L | — | 1,500 | — | 97 L |
| GTA855-G2 | 14 L | 8 | 1,500 | 104 L (109.9 qt) | 25 L |
| GTA855-G3 | 14 L | — | 1,500 | — | — |
Each figure is from that variant’s own documents (see its engine page for sources). Oil capacity can differ between applications of the same engine; check the manual for your generator set.
| Part # | Description | Category |
|---|---|---|
| 3801468 | Set, Lower Engine Gasket | Gasket |
| 4024959 | Set, Upper Engine Gasket | Gasket |
| 3014404 | Nozzle, Piston Cooling | Injector |
| 214950 | Bearing, Connecting | Service part / kit |
| 3043928 | Camshaft | Service part / kit |
| 3081251 | Housing, Cam Follower | Service part / kit |
| 3801106 | Kit, Camshaft Bushing | Service part / kit |
| 3801260 | Set, Main BRG-STD | Service part / kit |
| 3801826 | Kit, Cylinder Liner | Service part / kit |
| 4955662 | Kit, Engine Piston | Service part / kit |
| 3054948 | Ring, Liner Seal | Seal |
| 3411335 | Thermostat | Thermostat |
Parts cataloged across all variants of this engine family — verify the exact part fits your specific variant and serial number before ordering.