Westerbeke — Drive Belt Adjustment
Adjustments · Alternator drive belt
From a Westerbeke operator's manual covering: 16.0 BEDA, 20.0 BED, 25.0 BED, 32.0 BEDA. Check it applies to your exact model before use.
Applies to: Westerbeke 20.0 BED, Westerbeke 25.0 BED
Before you start
- Never check or adjust the drive belt's tension while the engine is in operation.
Parts for this job
- 031152 Belt — Westerbeke 20.0 BED Amazon eBay $16.95
- 013810 Belt — Westerbeke 25.0 BED eBay $32.00
Part numbers from the service-parts lists for Westerbeke 20.0 BED, Westerbeke 25.0 BED. Verify against your serial number before ordering; some links are affiliate links.
Procedure
- Remove the belt guard.
- Loosen the alternator adjusting strap bolt and the base mounting bolt.
- With the belt loose, inspect for wear, cracks, and frayed edges.
- Pivot the alternator on the base mounting bolt to loosen or tighten.
- Tighten the base mounting bolt and the adjusting strap bolt.
- Operate the generator about 5 minutes, shut down and recheck belt tension.
- Replace the guard.
Specs & values
- Belt deflection no less than 3/8 inch (10 mm) and no more than 1/2 inch (12 mm)
Full service-parts list: Westerbeke 20.0 BED →, Westerbeke 25.0 BED →
Source: Westerbeke operator's 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.