Mitsubishi S12A2 User Manual

7-30
Chapter 7 ASSEMBLY OF BASIC ENGINE
5.7 Cylinder Head Bolt - Tighten
Because the cylinder head bolts (long) are used to tighten
both the cylinder head and the rocker shaft bracket, the long
cylinder head bolts should be tightened after the rocker shaft
bracket is installed.Two methods of cylinder head bolt tight-
ening, torque tightening and angle controlled tightening, are
available.
Note: If the standard socket tool interferes with the rocker
bracket, use the socket wrench (special tool).
5.7.1 Torque tightening method
(1) Tighten the cylinder head bolts progressively to the
specified torque in the sequence shown in illustration.
(2) Tighten all the bolts, and then loosen them, and tighten
them again according to this torque method.(2-time
tightening method)
5.7.2 Angle controlled tightening method
(1) Tighten the cylinder head bolts to the specified snug
torque in the sequence shown the illustration.
(2) Tighten the cylinder head bolts to the specified angle in
the sequence shown the illustration.
(3) Loosen all bolts, and then angle controlled tighten them
again.(2-time tightening method)
Cylinder Head Bolts - Tightening Sequence
Cylinder Head Bolt - Tighten
Tightening position Snug torque
Angle
method
S12A2-1
Cylinder head bolt
(short)
118±5.9 N·m
{12±0.6 kgf·m}
[87±4 lbf·ft]
75±3°
Cylinder head bolt
(long)
196±9.8 N·m
{20±1.0 kgf·m}
[145±7 lbf·ft]
60±3°
S12A2-2
Cylinder head bolt
(short)
118±5.9 N·m
{12±0.6 kgf·m}
[87±4 lbf·ft]
110±3°
Cylinder head bolt
(long)
196±9.8 N·m
{20±1.0 kgf·m}
[145±7 lbf·ft]
110±3°
Tightening torque of torque method:
392 ± 20 N·m {40 ± 2.0 kgf·m} [289 ± 14.5 lbf·ft]
[Wet] 2-time tightening
Cylinder head bolts (Long)
1
2
3
4
5
6
Snug torque of
angle method:
Short bolt:
118 ± 5.9 N·m
{12 ± 0.6 kgf·m}
[87 ± 4.3 lbf·ft]
Long bolt:
196 ± 9.8 N·m
{20 ± 1.0 kgf·m}
[145 ± 7.2 lbf·ft]
Socket wlench
P/N:32591-01100

Mitsubishi S12A2 Specifications

General

Brand	Mitsubishi
Model	S12A2
Category	Engine
Language	English