G643 (E) Service Manual Chapter 3. Engine Mechanical System 40
Cylinder Heads
Tools Needed A
Torque Angle Meter 1
NOTE : When installing the cylinder heads use a
new head gasket. Do not use sealer on the
composite gasket.
Tighten the cylinder head bolts in the following
sequence.
All bolts are torqued to a torque of 30 N·m (22 lb·ft).
On the second pass a tool A degree wheel must be
used.
Bolts in sequence.
1. Short length bolts (11, 7, 3, 2, 6, 10) 55 degrees
2. Medium length bolts (12, 13) 65 degrees
3. Long length bolts (1, 4, 8, 5, 9) 75 degrees
Valve Clearence
(1) The 4.3 liter engine has screw-in rocker arm
studs with positive stop shoulders, NO valve
adjustment is necessary. When the valve train
requires service you simply tighten the rocker
arm nuts to 25 N·m (18 lb·ft).
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