Cummins/Onan — Coolant thermostat removal/installation
Repair & overhaul · Cooling system
From a Cummins/Onan owner's manual covering: CFP-015, CFP11E, CFP15E, CFP23E, CFP30E, CFP50, CFP59, CFP5E, CFP60E, CFP7E, CFP83, CFP83-F10…. Check it applies to your exact model before use.
Applies to: Cummins/Onan CFP23E, Cummins/Onan CFP83-F10, Cummins/Onan CFP83 engine
Before you start
- Always use the correct thermostat, and never operate the engine without a thermostat installed.
Procedure
- Remove the upper coolant hose clamps and upper coolant hose at the thermostat housing.
- Remove the (2) thermostat housing flange cap screws and the thermostat flange.
- Remove the thermostat and gasket from the housing.
- Clean the housing flange faces of dirt buildup, oxidation, and sludge.
- If still in good condition, re-install the thermostat in the housing.
- Replace the thermostat flange and cap screws.
Specs & values
- Standard thermostat range 180-203 FridayParts $78.89 F (82-95 C)
Full service-parts list: Cummins/Onan CFP23E →, Cummins/Onan CFP83-F10 →
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.