The Detroit Diesel S50 is a 8.5 L 6-cylinder turbocharged, intercooled engine rated at 1800 rpm, producing up to 156 kW. It powers generator sets from Atlas Copco and Cummins/Onan, including the QAS228 Gd USA and 4D6. It holds 6.8 L (1.8 gal) of oil and 9.2 L (2.4 gal) of coolant.
Maintenance schedule
| Item | Spec | Capacity | Part # | Interval | |
|---|
| Air filter | Clean/Replace | | — | 2000 hr | |
| Fuel filter | Replace | | — | 500 hr | |
| Oil filter | Replace | | — | 2000 hr | |
| Battery | Replace | | — | 500 hr | |
| Belt | Replace | | — | 2000 hr | |
| Coolant | Check/Clean | 9.2 | — | 500 hr | |
| Oil | High-quality, mineral, hydraulic or synthesized hydrocarbon oil with rust and oxidation inhibitors, anti-foam and anti-wear properties is recommended. | 6.8 | — | 2000 hr | |
| Spark plug | Check/Replace | | — | 2000 hr | |
Pooled from every document that names this exact engine — confirm the interval and part number against your unit's serial number.
Common questions
What is the oil capacity of the Detroit Diesel S50?
The Detroit Diesel S50 engine has an oil capacity of 6.8 liters.
What is the displacement of the Detroit Diesel S50?
The Detroit Diesel S50 has a displacement of 8.5 liters with 6 cylinders.
Which generators use the Detroit Diesel S50 engine?
The Detroit Diesel S50 powers 2 generator set(s), including Atlas Copco QAS228 Gd USA, Cummins/Onan 4D6.
How often should you change the oil in the Detroit Diesel S50?
The Detroit Diesel S50 oil change interval is every 2000 hours.
What is a common problem with the Detroit Diesel S50 engine?
A commonly reported issue on generators using the Detroit Diesel S50 is: Alternator does not excite. Cause: Blown fuse. Fix: Replace fuse.