Cummins/Onan N52M — Governor Adjustments
Adjustments
For the Cummins/Onan N52M, from the Cummins/Onan service manual.
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Procedure
- Make governor adjustments concurrent with carburetor adjustments.
- Linkage Adjustment: Adjust length so with engine stopped and tension on governor spring, stop on carburetor throttle lever is 1/32 inch from carburetor stop boss.
- Speed Adjustment: Check speed with tachometer. Turn speed adjusting nut IN to increase speed or OUT to decrease.
- Sensitivity Adjustment: Move spring toward governor shaft to increase sensitivity; toward linkage end to decrease.
- Low Speed Stop Adjustment: Set screw for approximately 50 to 100 rpm above throttle stop screw setting. Preferred speed is 1000 rpm.
Tools required
- Tachometer Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Linkage 1/32 inch
- Low speed stop 50-100 Amazon eBay $14.50 rpm above throttle stop
- Preferred speed 1000 rpm
Source: Cummins/Onan service 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.