Westerbeke 90A FOUR — Valve Clearance Adjustment
Adjustments · Cylinder Head / Valves
For the Westerbeke 90A FOUR, from the Westerbeke operator's manual.
Before you start
- Do NOT retorque the cylinder head bolts. They are stretch bolts and do not require retorquing.
Procedure
- Remove the cylinder head cover.
- Set the piston of No. 1 cylinder to Top Dead Center (TDC) of its compression stroke.
- Check the valve clearances for intake No. 1 and No. 2 cylinders and exhaust No. 1 and No. 3 cylinders.
- Adjust these valves if clearances deviate from the specified values.
- Turn the crankshaft one turn so the No. 4 cylinder piston is at TDC of its compression stroke.
- Check the remaining valve clearances: intake No. 3 and No. 4, exhaust No. 2 and No. 4.
- Install the cylinder head cover.
Specs & values
- Valve clearance (engine cold) Intake: 0.012 in (0.30 mm)
- Valve clearance (engine cold) Exhaust: 0.014 in (0.35 mm)
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.