Westerbeke 20B TWO/30B THREE - CYLINDER HEAD BOLT TIGHTENING

Cylinder Head Bolt Tightening Sequence
CAUTION
rlghten the cylinder head bolts to the specified torque before the valves are adjusted.
NOTE: The rocker shaft assembly should be removed to allow access to the cylinder head
bolts.
2-CYLIHDER 28B TWO
UNDERLYIN6
CYLINDERS
3-CYLINDER 38B THREE
£IUNE
FRONT
ENGINE
FROHT
0-
SUB BOLTS
2 Cylinder
2OBTWO
0-
3 CyRnder
30BTHREE
Cylinder Head Bolt rlghtening Sequence
Torque the cylinder head bolts in the numbered sequence shown in the Rlustration shown above. The engine
should be cold Before torquing each head bolt, loosen the bolt slightly. and then tighten the bolt to the
specified torque.
Torque Specifications
20B TWO: Bolts '" 1 and 2
14.4t021.71b-ft (2.0 to 3.0 kg-m)
Bolts '" 3, 4, 5, 6, 7 and 8
54.2 to 61.41b-ft (7.5 to 8.5 kg-m)
30B THREE: Bolts '" 1, 2, and 3
Bolts '" 4,5,6,7,8,9, 10 and 11
14.4 to 21.7 Ib-ft (2.0 to 3.0 kg-m)
54.2 to 61.41b-ft (7.5 to 8.5 kg-m)
Rocker shaft hold-down bolts:
10.8to 15.91b-ft (1.5 to 2.2 kg-m)
All Main bolts are 14 mm across the bolt head lIats.
All Sub bolts are 12 mm across the bolt head lIats.
Rocker shaft
hold-down bolts are 12 mm across the bolt head lIats
~ WESTERBEKE
Engines & Generators
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