Westerbeke 90A FOUR — Adjusting Belt Tension
Adjustments · Drive Belt / Alternator
For the Westerbeke 90A FOUR, from the Westerbeke operator's manual.
Before you start
- Never attempt to check or adjust the drive belt's tension while the engine is in operation.
Procedure
- 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 the left or right as required to loosen or tighten.
- Tighten the base mounting bolt and the adjusting strap bolt.
- Run the engine for about 5 minutes, then shut down and recheck the belt tension.
Specs & values
- Belt deflection no less than 3/8 inch (10mm) and no more than 1/2 inch (12mm) at the midpoint of the longest span
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.