Cummins/Onan — Carburetor and Governor Adjustment
Adjustments
From a Cummins/Onan operator's manual covering: P216, P218, P220. Check it applies to your exact model before use.
Applies to: Cummins/Onan P216, Cummins/Onan P218, Cummins/Onan P220
Before you start
- If it is necessary to make adjustments while the engine is running, use extreme caution when close to hot exhausts, moving parts, etc.
Procedure
- Start the engine and allow it to warm up thoroughly (at least 10 minutes).
- Move the engine speed control to the slow position.
- Bend or turn the low speed stop on the governor so the throttle stop screw on the carburetor controls engine speed.
- Adjust the throttle stop screw for 1000 rpm idle.
- Adjust the governor low speed stop for 1100 rpm idle.
- Move the engine speed control to the fast position.
- Bend the high speed stop on the governor so the engine runs at the equipment manufacturer's recommended speed.
Specs & values
- 1000 rpm idle at throttle stop screw
- 1100 rpm governor low speed stop
- Idle fuel adjustment restricted to 1/4 turn by limiting cap
- No main fuel adjustment screw
Full service-parts list: Cummins/Onan P216 →, Cummins/Onan P218 →, Cummins/Onan P220 →
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.