The Cummins/Onan GTA50 is a 50.3 L 16-cylinder turbocharged & aftercooled engine rated at 1800 rpm. It powers generator sets from Cnge and Cummins/Onan, including the GTA50-series C760N6 and GTA50-series C815N6. It holds 4 L (1.1 gal) of oil and 204 L (53.9 gal) of coolant.
Also known as: Cummins GTA50
Part of the Cummins/Onan GTA50 engine family — 2 variants share parts & fitment.
| Oil capacity | 4.0 L |
|---|---|
| Coolant capacity | 204.0 L |
| Displacement | 50.3 L |
| Cylinders | 16 |
| Aspiration | Turbocharged & Aftercooled |
| Rated speed | 1800 rpm |
Shared across brands: Cnge, Cummins/Onan
Compiled from service & troubleshooting documentation across every generator set that uses the Cummins/Onan GTA50.
| Item | Spec | Capacity | Part # | Interval | |
|---|---|---|---|---|---|
| Air filter | — | find | |||
| Fuel filter | — | find | |||
| Oil filter | — | find | |||
| Belt | — | find | |||
| Coolant | — | ||||
| Coolant filter | — | find | |||
| Oil | multi-viscosity 15W40 Heavy Duty Gas Engine Oil (HD – GEO) | 204.0 L | — |
Pooled from every document that names this exact engine — confirm the interval and part number against your unit's serial number.
The Cummins/Onan GTA50 engine has an oil capacity of 4.0 liters.
The Cummins/Onan GTA50 has a displacement of 50.3 liters with 16 cylinders.
The Cummins/Onan GTA50 powers 3 generator set(s), including Cnge GTA50, Cummins/Onan GTA50-series C760N6, Cummins/Onan GTA50-series C815N6.
A commonly reported issue on generators using the Cummins/Onan GTA50 is: Hard To Start - Long Cranking Time. Fix: Check Pressure Regulator..