Cummins/Onan M1894s / M1895s — Filling Coolant
Maintenance · engine cooling system
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
Before you start
- To prevent severe scalding, always let the engine cool down before removing the coolant pressure cap; turn the cap slowly and do not open it fully until pressure is relieved.
- The sea water pump impeller can disintegrate if pump prime has been lost.
Procedure
- Prime the sea water pump by disconnecting the pump outlet hose and pouring water into the pump outlet; reconnect hose and open sea cock (heat exchanger cooled sets).
- Fill coolant until the expansion tank is approximately half full; bleed air from any air vents while filling.
- Run the engine while watching the coolant level; add coolant as necessary so the expansion tank is full at normal operating temperature.
- Secure the pressure cap.
Specs & values
- 50-50 FridayParts $119.95 mixture of fresh water and ethylene glycol antifreeze.
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.