The Cummins/Onan QSK38-G4 is a 38 L 12-cylinder turbocharged, after-cooled engine rated at 1800 rpm. It powers generator sets from Cummins/Onan.
Also known as: Cummins QSK38-G4
Part of the Cummins/Onan QSK38 engine family — 7 variants share parts & fitment.
| Displacement | 38.0 L |
|---|---|
| Cylinders | 12 |
| Aspiration | turbocharged, After-cooled |
| Rated speed | 1800 rpm |
How to read your Cummins/Onan engine serial & model number →
| Item | Action | Hours | Months | Notes |
|---|---|---|---|---|
| valve clearance | Check | 2000 hr | B-Series (4BT3.3): valve clearance checks not required for 2000 hours, twice the industry standard | |
| engine overhaul | Other | 20000 hr | QSK23-Series: expected life cycle to 20,000 hours before first overhaul |
Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.
| Part # | Description | Category |
|---|---|---|
| MCBQSK0068 | Water Pump Gasket Set | Gasket |
| M-2885786 | Cylinder Liner Kit | Service part / kit |
| M-3007525 | Cylinder Liner Kit | Service part / kit |
| M-3022157 | Cylinder Liner | 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.
The Cummins/Onan QSK38-G4 has a displacement of 38.0 liters with 12 cylinders.
The Cummins/Onan QSK38-G4 powers 1 generator set(s), including Cummins/Onan QSK38-G4.