Cummins/Onan 4.0 BF-1R/9500 — Ignition Timing Check (Engine Not Running, Cold)
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 (breaker box coil-lead terminal to good ground).
- Turn crankshaft against rotation (counterclockwise) until points close.
- Slowly turn crankshaft with rotation (clockwise).
- Lamp should go out just as the points break, which is 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 (cold, static)
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.