Cummins/Onan 4.0 BF-1R/9500 — Adjusting Starter Pinion Clearance
Adjustments
For the Cummins/Onan 4.0 BF-1R/9500, from the Cummins/Onan service manual.
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Before you start
- Increasing number of washers decreases clearance; decreasing increases clearance
Procedure
- Connect a battery of proper voltage between Switch terminal of solenoid and bracket of starter (ground) so pinion will travel
- Push pinion back until play is taken out of lever and clutch mechanism
- Measure the pinion clearance
- Clearance should be 0.002 to 0.008 inch
- Adjust by removing solenoid and increasing or decreasing number of fiber washers
Specs & values
- Pinion clearance 0.002 to 0.008 inch
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.