The Cummins/Onan 6BTAA5.9-G3 is a 5.9 L 6-cylinder turbo charged engine rated at 1500 rpm, producing up to 127 kW. It powers generator sets from Cummins/Onan. It holds 16.4 L (4.3 gal) of oil and 26 L (6.9 gal) of coolant.
Also known as: Cummins 6BTAA5.9-G3
Part of the Cummins/Onan 6BTAA5.9 engine family — 9 variants share parts & fitment.
| Oil capacity | 16.4 L |
|---|---|
| Coolant capacity | 26.0 L |
| Displacement | 5.9 L |
| Cylinders | 6 |
| Aspiration | Turbo Charged |
| Rated speed | 1500 rpm |
| Gross power | 127 kW |
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.
| Fluid | Grade | Standard | Ambient | Capacity | Notes |
|---|---|---|---|---|---|
| Coolant | 50% ethylene glycol; 50% water | 26.0 l | Coolant Ratio as printed |
Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.
The Cummins/Onan 6BTAA5.9-G3 engine has an oil capacity of 16.4 liters.
The Cummins/Onan 6BTAA5.9-G3 has a displacement of 5.9 liters with 6 cylinders.
The Cummins/Onan 6BTAA5.9-G3 powers 1 generator set(s), including Cummins/Onan 6BTAA5.9-G3.