Westerbeke WPDS-20 Technical Manual page 53

A • .30
VALVE ROCKER CLEARANCE (Fig. C.3)
The correct clearance between the valve rockers and stem is given in "General Data".
1.
Unscrew the rocker cover nuts
(1)
and lift off cover.
2. Check the clearance at the position illustrated and the order as follows:
Check No. 1 valve with No. 8 fully open
Check No. 3 valve with No. 6 fully open
Check No. 5 valve with No. 4 fully open
Check No. 2 valve with No. 7 fully open
Check No. 8 valve with No. 1 fully open
Check No. 6 valve with No. 3 fully open
Check No. 4 valve with No. 5 fully open
Check No. 7 valve with No. 2 fully open
3. Adjust ifnecessary. by loosening the locknut (2) and turning adjustment screw (3)
until the clearance is correct.
4. Hold the screw against rotation and tighten the locknut. Refit the rocker cover,
checking that its gasket is serviceable.
Fig. C.3. Valve Rocker Clearance
OIL FILL CAP (Fig. C. 4)
The oil fill cap (1) incorporates an air filter which cannot be cleaned. Fit a new cap
at the recommended interval.
Fig. C.4. Oil Fill Cap