Cummins/Onan — Service Procedure

A Cummins/Onan service procedure — check it applies to your exact model before use.

Browse Cummins/Onan generators & specs →

Procedure

1. Run engine at maximum throttle and normal toad
2. Set main power mixture as lean as possible
3. Recheck head bolt torque and valve lash after
4. Run engine at idle speed (1200 rpm) for ten
5. Set idle stop screw speed at 1350 rpm.
6. Turn idle screw out until engine speed slows to

Source: manual:927-0754 Onan CCK-CCKA-CCKB (Spec A-J) Engine Service Manual (03-1986)L.pdf. Figures and steps are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.