Cummins/Onan CFP11E — Coolant Thermostat Removal/Installation
Repair & overhaul
For the Cummins/Onan CFP11E, from the Cummins/Onan operator's manual.
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Before you start
- Never operate the engine without a thermostat installed - engine can overheat
Procedure
- Remove the upper coolant hose clamps and upper coolant hose at the thermostat housing.
- Remove the two 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.
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.