Technical data

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