Cummins/Onan A052J727 — Refilling the Cooling System
Maintenance
For the Cummins/Onan A052J727, from the Cummins/Onan operator's manual.
Applies to: Cummins/Onan MDKD
Before you start
- Filling a hot engine with cold water can crack the manifold, head, and block.
- Low coolant level can cause severe engine damage.
Procedure
- Close the block and heat exchanger drain valves.
- Fill through the engine fill neck to the bottom of the neck.
- Start and run the engine a couple of minutes, then shut it down.
- Check coolant level, add as needed, and secure the pressure cap.
- Refill the recovery tank to the COLD mark.
Specs & values
- Fill to bottom of fill neck
Full service-parts list: Cummins/Onan MDKD →
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.