Westerbeke 20B TWO Tehnical Manual page 19

Specified Value/Standard Repair Limit
Rocker Arm
Rocker arm
1.0. 0.472
(12 mm)
Rocker arm to shaft clearance
-0.008 (Service limit)
(-0.2 mm)
Cylinder Block
Camshaft hole dia.
Front 1.654 Ball bearing hole
(42 mm)
NO.2 1.339
(34 mm)
No.3 (30B Three only) 1.299
(33 mm)
Rear 1.299
(33 mm)
Cylinder Bore
Bore size 2.992
+0.008
(76 mm) (+0.2 mm)
Oversize finish tolerance
o -
0.001 for each oversize
(0 -0.03 mm)
Cylindricity Within 0.0004
(0.01 mm)
Gasket fitting/surface distortion Within 0.0020 0.004
(0.05 mm) (0.1 mm)
Piston
Type Solid type
Material Aluminum alloy
0.0.
(skirt end) 2.992
(76 mm)
Clearance to cylinder
0.001 (Service limit)
(0.3 mm)
17 Westerbeke Engines