Cummins/Onan — Filling the Cooling System (Standard Radiator and Heat Exchanger Sets)
Maintenance
From a Cummins/Onan operator's manual covering: 275 DFBF, 300 DFCB, 350 DFCC. Check it applies to your exact model before use.
Applies to: Cummins/Onan 275 DFBF, Cummins/Onan 300 DFCB, Cummins/Onan 350 DFCC, Cummins/Onan DFBF, Cummins/Onan DFCB, Cummins/Onan DFCC, Cummins/Onan NT-855-G6 engine, Cummins/Onan NTA855-G6 engine, Cummins/Onan NTA855-G3 engine
Before you start
- Contact with hot coolant can result in serious burns.
Procedure
- Remove the cooling system pressure cap.
- Fill system with water or water/antifreeze mixture.
- Start engine and monitor coolant level with cap removed.
- Add coolant as trapped air is expelled.
- Replace pressure cap when coolant level is stable.
Full service-parts list: Cummins/Onan 275 DFBF →, Cummins/Onan 350 DFCC →, Cummins/Onan DFBF →, Cummins/Onan DFCC →
Source: Cummins/Onan operator's manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.