Cummins/Onan B43 / B48 — Breaker Point Replacement and Adjustment - Side Adjust Points

Maintenance · ignition system

For the Cummins/Onan B43 / B48, from the Cummins/Onan service manual.

Applies to: Cummins/Onan B48

Procedure

1. Remove spark plugs.
2. Remove breaker box cover; rotate crankshaft clockwise (facing flywheel) until points are fully open.
3. Remove mounting nut (E) and pull points from box just far enough so screw (B) can be removed and leads disconnected.
4. Remove screw (F) and replace condenser.
5. Replace points with a new set but do not completely tighten mounting nut (E).
6. Insert a screwdriver in notch (G) on right side of points and set gap at 0.021 inch (0.53 mm).
7. Tighten mounting nut and recheck gap.
8. Replace breaker cover, spark plugs, and spark plug cables.

Full service-parts list: Cummins/Onan B48 →

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.

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