Cummins/Onan — Ignition timing - engine stopped (MJB)
Adjustments
From a Cummins/Onan service manual — check it applies to your exact model before use.
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Procedure
- Remove breaker box cover; disconnect lead to ignition points and install continuity test lamp and battery.
- Rotate flywheel clockwise until TC mark on flywheel approaches timing indicator.
- Slowly rotate flywheel clockwise until light goes out; this is the ignition point (5 ATC).
- If timing is incorrect, align 5 ATC mark and timing pointer; loosen breaker plate capscrews and rotate plate so light goes out.
- Tighten plate and recheck timing.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Ignition at 5 degrees ATC when stopped
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.