Cummins/Onan 80MDKAL11454B — Flushing and Cleaning the Cooling System
Maintenance · cooling system / heat exchanger
For the Cummins/Onan 80MDKAL11454B, from the Cummins/Onan operator's manual.
Applies to: Cummins/Onan MDKAL, Kubota D1005 engine
Before you start
- Never pour hot water into a cold engine or cold water into a hot engine; this can crack the head or cylinder block.
- Do not operate the unit without water for even a few minutes.
- Contact with hot coolant can cause severe burns.
Procedure
- Drain the system by opening the heat exchanger drain and the cylinder block drain on the left side of the engine; drain completely and avoid spillage into bilge.
- If rust and scale have collected in the water jacket or heat exchanger, clean with a good cleaning compound following its instructions.
- After cleaning, drain the system and fill with clean water.
- Run the genset for 10 minutes, then drain the system completely.
- Refill with the 50/50 coolant mixture.
Specs & values
- Run 10 minutes for flushing
Full service-parts list: Cummins/Onan MDKAL →, Kubota D1005 engine →
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.