Cummins/Onan — Fill Cooling System
Maintenance
From a Cummins/Onan service manual — check it applies to your exact model before use.
Applies to: Cummins/Onan MDKUB, Cummins/Onan MDKWB, Kubota Z482B engine, Kubota D722B engine
Before you start
- Do not exceed a 50-50 mixture of ethylene glycol and water.
Procedure
- Verify that all drain cocks are closed and all hose clamps secure.
- Remove the cooling system pressure cap and slowly fill the cooling system with the coolant mixture.
- Leave the pressure cap off and start the engine.
- As trapped air is expelled, add additional coolant.
- Replace the pressure cap when the coolant level is stable.
- At the recovery tank, add coolant mixture to the COLD mark.
- Operate the genset for approximately 15 minutes, until normal operating temperature is maintained.
- Shut off the genset and let it cool down.
- Add coolant to the recovery tank until the level stabilizes at the COLD mark.
Specs & values
- 50-50 FridayParts $119.95 mixture of ethylene glycol and distilled water
- approximately 15 minutes
Full service-parts list: Cummins/Onan MDKUB →, Cummins/Onan MDKWB →, Kubota Z482B engine →
Source: Cummins/Onan service 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.