Cummins/Onan 4.0 BF-1R/9500 — Ignition Timing - Engine Running (Hot Setting)
Adjustments
For the Cummins/Onan 4.0 BF-1R/9500, from the Cummins/Onan service manual.
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Procedure
- Connect a timing light according to its manufacturer's instructions (either spark plug may be used)
- Remove the dot button on blower housing to view timing marks
- Start engine and check timing; flywheel mark should line up with the 21 degree mark on cover when warmed up
- Replace dot button, breaker box cover and any other hardware removed
Tools required
- Timing light Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- 21 degree mark when warmed up
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.