Cummins/Onan — USE INSIDE MOUNTING

For these Cummins/Onan models: 4CCK, 5CCK.

Applies to: Cummins Onan 4Cck, Cummins Onan 5Cck

Procedure

1. Remove the cover from the breakér box. If the timing is very far off, attain an approximate setting by loosening the mounting screws and shifting the breaker box (and spacer if used) to align the witness marks on the cylinder block and breaker box (or spacer).
2. Crank the engine over slowly by hand in the direction of crankshaft rotation until the witness mark on the flywheel and the TC mark on the gear cover ate exactly in line (Fig. 11),
3. Adjust the ignition breaker point gap width to .020” at full separation. 4, Turn the flywheel to the left, against crankshaft rotation, until the timing mark is about two inches past the 25° mark on the gear cover.
4. Turn the flywheel slowly to the right and note whether the ignition points just separate when the matk on the flywheel aligns with the correct degree mark (19° or 25°) on the gear cover. if the marks align as the points break, timing is correct. If they do not, loosen the breaker box mounting screws and shift the whole breaker box assembly slightly toward the #1 cylinder to retard the timing (points breaking too soon), or shift it slightly away from the #1 cylinder to advance the timing (points not breaking soon enough). Tighten

Source: manual:927-0500 Onan CCK (spec A-K) Genset Service manual (06-1971).pdf. Figures and steps are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.