Westerbeke 20B TWO - Page 33

Valve Removal
1. Dismount the cylinder head assembly.
2. Depress the valve retainer (to compress the valve spring) and remove the retainer lock.
3. Remove the valve.
Valve Inspection and Repair
If any parts are found defective, repair or replace them.
Margin
Inspection of Valve and Valve Spring
Valve fatigue and damage
Inspection item
Standard Service limit
Free length (Dim) 40.5
-I
Load (kg/ mm) 5.94/35.5 -15%
Squareness
2'
3'
Margin (mm)
1.0 0.5
Q------ Wear and damage
(Without for
agricultural)
~~
@
Dents and wear
I-----Ridge and damage
valve spring te5ter
31 Westerbeke Engines