Cummins/Onan — Distributor Point Gap Check and Adjustment
Adjustments
From a Cummins/Onan owner's manual — check it applies to your exact model before use.
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Before you start
- Do not use a file, sandpaper, or emery cloth to clean or remove pits from distributor points.
Procedure
- Crank the engine with the starter until the movable arm rubbing block rests on a cam high point.
- Check the point gap with a 0.025 inch feeler gauge.
- If adjustment is required, loosen the point assembly lock screws.
- Insert the blade of a screwdriver in the adjustment slots and set a 0.025 inch gap.
- Tighten the lock screws, then recheck the point gap.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- 0.025 inch point gap (table: 0.024-0.026 inch)
Source: Cummins/Onan owner's 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.