Cummins/Onan 5MDKAU — Cleaning and Draining the Heat Exchanger
Maintenance
For the Cummins/Onan 5MDKAU, from the Cummins/Onan service manual.
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Before you start
- Tubes are soft copper alloy and can be damaged by metal rods
- Avoid spilling raw water on electrical components
Procedure
- Remove the side enclosure panel or the raw water pump for access.
- Remove the drain plug or the cleanout cover.
- Clean and flush the raw water tubes; do not use metal rods.
- Use thread sealant on the drain plug and a new cleanout cover gasket if damaged.
- Reassemble all the parts that were disassembled for access.
Specs & values
- Heat exchanger mounting bolts 19 lb-ft (26 N-m)
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.