Cummins/Onan M1894s / M1895s — Heat Exchanger Cleaning
Maintenance
For the Cummins/Onan M1894s / M1895s, from the Cummins/Onan owner's manual.
Applies to: Cummins/Onan M1894s, Cummins/Onan M1895s, Cummins/Onan MCGBA, Cummins/Onan MCGCA, Cummins/Onan MCGDA, Cummins/Onan MCGDB, Cummins/Onan MCGGA
Procedure
- Remove the end cap and drain plug to clean the sea water side of the heat exchanger.
- Follow the instructions in the engine Operation Manual for cleaning the heat exchanger.
- Take the heat exchanger to a radiator shop if it is badly fouled.
- Remove the end cap to remove impeller debris if the sea water pump impeller disintegrates.
- Replace the drain plug if the zinc anode is more than half consumed.
Full service-parts list: Cummins/Onan M1894s →, Cummins/Onan M1895s →, Cummins/Onan MCGBA →, Cummins/Onan MCGCA →, Cummins/Onan MCGDA →, Cummins/Onan MCGDB →, Cummins/Onan MCGGA →
Source: Cummins/Onan owner'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.