Cummins/Onan — Axial Alignment Procedure
Adjustments · Generator/engine alignment
From a Cummins/Onan service manual — check it applies to your exact model before use.
Applies to: Cummins/Onan DFE
Procedure
- Fasten dial indicator holding device to skid base, engine block, or generator shell with magnetic base or clamp.
- Position so the sensor point rests on the generator shaft hub.
- Bar the engine over clockwise (viewed from engine flywheel) through a couple of rotations.
- Record indicator readings in eight equally spaced points around the shaft diameter to provide a T.I.R.
- To correct an out-of-tolerance T.I.R., remove capscrews connecting drive discs and flywheel.
- Mark the drive discs and flywheel with respect to each other.
- Rotate engine or generator so drive disc holes are repositioned 180 degrees from original location.
- Reinstall drive disc capscrews and retorque; re-check shaft alignment.
- If T.I.R. unchanged, rotate discs to 30, 60, or 90 degrees from original location.
- If T.I.R. does not improve, inspect flywheel pilot and drive disc runouts.
Tools required
- Dial indicator with holding device (magnetic base or clamp) Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Optimal T.I.R. runout would be .000"
Full service-parts list: Cummins/Onan DFE →
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.