Cummins/Onan W3M-19 — Fan Belt Adjustment
Adjustments
For the Cummins/Onan W3M-19, from the Cummins/Onan service manual.
Applies to: Cummins/Onan W3M-19, Cummins/Onan W2C engine
Before you start
- Do not use a fan belt until it breaks
- Too tight a belt causes unnecessary wear on fan bearing
Parts for this job
Part numbers from the service-parts list for Cummins/Onan W3M-19. Verify against your serial number before ordering; some links are affiliate links.
Procedure
- Loosen the cap screws which hold the fan bracket.
- Raise or lower the bracket to adjust belt tension.
- Correct tension allows one side of belt pushed inward about 1/4 in. midway between pulleys.
- Tighten the cap screws securely.
Tools required
- Wrenches Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Correct tension permits about 1/4 in. deflection
Full service-parts list: Cummins/Onan W3M-19 →
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.