Cummins/Onan 4.0 BF-1R/9500 — Ignition Timing - Engine Not Running (Cold Setting)
Adjustments
For the Cummins/Onan 4.0 BF-1R/9500, from the Cummins/Onan service manual.
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Procedure
- Connect a continuity test lamp set across the ignition breaker points (one prod to coil lead terminal, other to engine ground)
- Turn crankshaft counterclockwise until the points close
- Slowly turn the crankshaft clockwise with rotation
- Lamp should go out just as points break, which is ignition at 26 degrees BTC
Tools required
- Continuity test lamp set Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- 26 degrees BTC
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.