The Cummins/Onan 4BTAA3.3-G18 is a 3.3 L 4-cylinder turbocharged & charge air cooled engine rated at 1800 rpm, producing up to 53 kW. It powers generator sets from Cummins/Onan. It holds 7.9 L (2.1 gal) of oil and 13 L (3.4 gal) of coolant.
Also known as: Cummins 4BTAA3.3-G18
Part of the Cummins/Onan 4BTAA3.3 engine family — 10 variants share parts & fitment.
| Oil capacity | 7.9 L |
|---|---|
| Coolant capacity | 13.0 L |
| Displacement | 3.3 L |
| Cylinders | 4 |
| Aspiration | Turbocharged & Charge Air Cooled |
| Rated speed | 1800 rpm |
| Gross power | 53 kW |
How to read your Cummins/Onan engine serial & model number →
| Item | Spec | Capacity | Part # | Interval | |
|---|---|---|---|---|---|
| Air filter | Normal Duty element with restriction indicator | — | |||
| Fuel filter | Spin on fuel filters with water separator | — | |||
| Oil filter | Spin on full flow filter | — | |||
| Coolant | 13.0 l | — | |||
| Oil | 7.9 l | — |
Pooled from every document that names this exact engine — confirm the interval and part number against your unit's serial number.
| Item | Action | Hours | Months | Notes |
|---|---|---|---|---|
| valve clearance | Check | 2000 hr | First service — Valve clearance checks not required until 2,000 hours, twice the industry standard |
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) | 13.0 l | Jacket Water cooled cooling system design |
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 |
|---|---|---|
| PI144D1 | Alternator Model | Alternator |
| UC274C | Alternator Model | Alternator |
| UC274K | Alternator Model | Alternator |
| V2403-M-E3BG | Engine Model | 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 4BTAA3.3-G18 engine has an oil capacity of 7.9 liters.
The Cummins/Onan 4BTAA3.3-G18 has a displacement of 3.3 liters with 4 cylinders.
The Cummins/Onan 4BTAA3.3-G18 powers 1 generator set(s), including Cummins/Onan 4BTAA3.3-G18.