Cummins/Onan B43 / B48 — Flywheel Removal
Repair & overhaul
For the Cummins/Onan B43 / B48, from the Cummins/Onan service manual.
Applies to: Cummins/Onan B48
Before you start
- Incorrect flywheel removal can result in severe personal injury. Do not remove flywheel screw completely when using flywheel puller.
- Improper flywheel removal can cause gear case damage. Do not use any tools to pry against gear cover when removing flywheel.
Procedure
- Turn the flywheel mounting screw outward about two turns.
- Install a puller bar on the flywheel.
- Turn the puller bar bolts in, alternately, until the wheel snaps loose on the shaft.
- Unscrew the puller from the flywheel, remove the flywheel mounting screw and washer, and pull the flywheel off the shaft.
- Always use a steel key for mounting the flywheel.
Tools required
- flywheel puller Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Full service-parts list: Cummins/Onan B48 →
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.