Cylinder Head Bolt Tightening - Westerbeke 20B TWO/30B THREE Operator's Manual

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
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WESTERBEKE
Engines & Generators
52