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03-M-DI Series, WSM
[3] TIGHTENING TORQUES
Screws, bolts and nuts must be tightened to the specified torque using a torque wrench, several screws, bolts and
nuts such as those used on the cylinder head must be tightened in proper sequence and the proper torque.
(1) Tightening Torques for Special Use Screws, Bolts and Nuts
NOTE
• In removing and applying the screws, bolts and nuts marked with "*", a pneumatic wrench or similar
pneumatic tool, if employed, must be used with enough care not to get them seized.
• For "*" marked screws, bolts and nuts on the table, apply engine oil to their threads and seats before
tightening.
• The letter "M" in Size x Pitch means that the screw, bolt or nut dimension stands for metric. The size is
the nominal outside diameter in mm of the threads. The pitch is the nominal distance in mm between two
threads.
Item
Cylinder head cover screw
* Cylinder head screw
* Main bearing case screw 1
* Main bearing case screw 2
* Flywheel screw
* Connecting rod screw
* Rocker arm bracket screw
* Idle gear shaft screw
Fan drive pulley mounting nut
* Bearing case cover screw
Glow plug
Nozzle holder clamp screw
Oil Switch taper screw
Injection pipe retaining nut
Overflow pipe assembly retaining screw
Camshaft set screw
Hi-idling body
(2) Tightening Torques for General Use Screws, Bolts and Nuts
Grade
Nominal
Unit
Diameter
M6
7.9 to 9.3
M8
17.7 to 20.6
M10
39.2 to 45.1
M12
62.8 to 72.6
Screw and bolt material grades are shown by numbers punched on the screw and bolt heads. Prior to
tightening, be sure to check out the numbers as shown below.
Punched number
None or 4
7
Special screw and bolt S43C, S48C (Refined)
Size x Pitch
M6 × 1.0
M11 × 1.25
M9 × 1.25
M10 × 1.25
M12 × 1.25
M8 × 1.0
M8 × 1.25
M8 × 1.25
M8 × 1.25
M10 × 1.25
M12 × 1.5
M8 × 1.25
Standard Screw and Bolt
N·m
kgf·m
0.80 to 0.95
1.8 to 2.1
4.0 to 4.6
6.4 to 7.4
Screw and bolt material grade
Standard screw and bolt SS400, S20C
N·m
6.9 to 11.3
93.1 to 98.0
46.1 to 50.9
68.6 to 73.5
98.0 to 107.8
44.1 to 49.0
23.5 to 27.5
23.5 to 27.5
–
137.3 to 156.9
23.5 to 27.5
19.6 to 24.5
–
25.5 to 29.4
PT 1/8
14.7 to 19.6
14.7 to 24.5
–
9.8 to 11.3
23.5 to 27.5
–
44.1 to 49.0
ft-lbs
N·m
5.8 to 6.9
9.8 to 11.3
13.0 to 15.2
23.5 to 27.5
28.9 to 33.3
48.1 to 55.9
46.3 to 53.5
77.5 to 90.2
S-4
DIESEL ENGINE
kgf·m
0.7 to 1.15
5.1 to 8.32
9.5 to 10.0
68.7 to 72.3
4.7 to 5.2
34.0 to 37.6
7.0 to 7.5
50.6 to 54.2
10.0 to 11.0
72.3 to 79.5
4.5 to 5.0
32.5 to 36.2
2.4 to 2.8
17.4 to 20.3
2.4 to 2.8
17.4 to 20.3
14.0 to 16.0
101.3 to 115.7
2.4 to 2.8
17.4 to 20.3
2.0 to 2.5
14.5 to 18.1
2.6 to 3.0
18.8 to 21.7
1.5 to 2.0
10.8 to 14.5
1.5 to 2.5
10.8 to 18.1
1.0 to 1.15
7.2 to 8.3
2.4 to 2.8
17.4 to 20.3
4.5 to 5.0
32.6 to 36.3
Special Screw and Bolt
kgf·m
1.00 to 1.15
7.23 to 8.32
2.4 to 2.8
17.4 to 20.3
4.9 to 5.7
35.4 to 41.2
7.9 to 9.2
57.1 to 66.5
ft-lbs
W1013236
ft-lbs
W10371750
W1012705
KiSC issued 10, 2009 A
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