Cummins/Onan — Ignition Timing - Engine Not Running
Adjustments · Ignition System
From a Cummins/Onan service manual — check it applies to your exact model before use.
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Procedure
- Connect continuity test lamp across breaker points.
- Turn crankshaft counterclockwise until points close.
- Slowly turn crankshaft clockwise.
- Lamp should go out just as points break.
- Loosen breaker box and move left to advance or right to retard.
Tools required
- Continuity test lamp Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
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.