Cummins/Onan 6.5NH - 3CR / 6000 A — Breaker Point Removal and Gapping

Adjustments · Ignition breaker points

For the Cummins/Onan 6.5NH - 3CR / 6000 A, from the Cummins/Onan service manual.

Applies to: Cummins/Onan NH engine

Procedure

1. Remove the cover of the breaker box.
2. Remove the spark plugs so the engine is easily rotated by hand.
3. Remove the breaker point mounting screws and install a new set; do not fully tighten yet.
4. Rotate the engine clockwise by hand until the flywheel mark and the gear cover TC mark align.
5. Turn the point adjusting cam screw until the point gap is 0.020 inch; tighten the mounting screws.
6. Turn the flywheel left past the timing marks, then right; points should separate when TC mark aligns with the correct degree mark.
7. Replace spark plugs.

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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