Westerbeke — Valve Clearance Adjustment
Adjustments · Cylinder head valve train
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
- Adjust the valve clearance when the engine is cold.
Procedure
- Retorque the cylinder head bolts before adjusting valves.
- Pull off the air breather pipe, remove rocker cover bolts and rocker cover.
- Position No. 1 piston at TDC on its compression stroke; adjust valves #1, 2, 3 and 6.
- Position No. 4 piston at TDC on its compression stroke; adjust valves #4, 5, 7 and 8.
- Valves are numbered 1 to 8 from the front of the engine to the back.
- Set each valve to 0.012 inch (0.3 mm) with a feeler gauge while the engine is cold.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Valve clearance 0.012 inches (0.3 mm), engine cold
- 32 kW exhaust valve clearance 0.014 inches (0.35 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.