Cummins/Onan — Starter Motor Reassembly
Repair & overhaul · Electric starting motor
From a Cummins/Onan service manual — check it applies to your exact model before use.
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Before you start
- Medium or heavy oil and grease may cause drive assembly to stick in cold weather.
Procedure
- Apply film of medium engine oil to bearing portions before reassembly.
- Apply small quantity of very light grade oil to exterior and interior of shaft screw.
- Assemble drive assembly with spline thread portion on armature side.
- Tighten self-locking nut to 170-220 in-lbs.
- Adjust armature with spacing washers to end play of .005-.015 in.
- Tighten thru-bolts to 35-44 in-lbs.
Tools required
- Torque wrench Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Self-locking nut 170-220 in-lbs
- Armature end play .005-.015 in
- Thru-bolts 35-44 in-lbs
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.