Cummins/Onan — Breaker Point Replacement/Adjustment
Adjustments · breaker point ignition
From a Cummins/Onan service manual — check it applies to your exact model before use.
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Before you start
- Make ignition adjustments with the engine cold and at rest. Do not file the points.
Procedure
- Disconnect the negative (-) battery cable at the battery terminal.
- Remove the breaker box cover clip and lift off the cover.
- Remove the spark plugs; turn the rotor through-bolt clockwise until the point gap is widest.
- Disconnect the ignition lead wire at screw A.
- Remove the point mounting screws (B) and lift out the point assembly; replace it.
- Adjust setscrew C to the specified gap using a flat thickness gauge.
- Replace the point box cover, spark plugs, and spark plug leads.
- Connect the negative (-) battery cable.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Breaker point gap 0.016 in (0.41 mm)
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.