American-Lincoln
1 - 35
91 WS
STANDARD METRIC TORQUE VALUES
When tightening torques are not specified, tighten the bolts and nuts according to the table below.
GRADE
No-Grade or 4T
7T
9T
SS41, S20C
S43C, S48C
SCR435, SCM435
Nom.
Unit
N.m
kgf.m
ft-lbs
N.m
kgf.m
ft-lbs
N.m
kgf.m
ft-lbs
Dia.
M6
7.85
0.80
5.79
9.81
1.00
7.23
12.26
1.25
9.04
(6mm, 0.24 in.)
to
to
to
to
to
to
to
to
to
9.32
0.95
6.87
11.28
1.15
8.32
14.22
1.45
10.49
M8
17.7
1.8
13.0
23.5
2.4
17.4
29.4
3.9
21.7
8mm, 0.31 in.)
to
to
to
to
to
to
to
to
to
20.6
2.1
15.2
27.5
2.8
20.3
34.3
3.5
25.3
M10
39.2
4.0
28.9
48.1
4.9
35.4
60.8
6.2
44.8
(10mm, 0.39 in.)
to
to
to
to
to
to
to
to
to
45.1
4.6
33.3
55.9
5.7
41.2
70.6
7.2
52.1
M12
62.8
6.4
46.3
77.5
7.9
57.1
103.0
10.5
75.9
(12mm, 0.47 in.)
to
to
to
to
to
to
to
to
to
72.6
7.4
53.5
90.2
9.2
66.5
117.7
12.0
86.8
ENGINE TORQUE VALUES
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 at the proper torque.
ITEM
Size & Pitch
N.m
kgf.m
ft-lbs
*Head Cover Cap Nuts
M6 x 1.0
3.9 to 5.9
0.4 to 0.6
2.9 to 4.3
*Head Bolts
M8 x 1.25
37.2 to 42.1
3.8 to 4.3
28.9 to 32.5
*Bearing Case Bolts 1
M6 x 1.0
12.7 to 15.7
1.3 to 1.6
9.4 to 11.6
*Bearing Case Bolts 2
M7 x 1.0
26.5 to 30.4
2.7 to 3.1
19.6 to 22.5
*Flywheel Bolts
M10 x 1.25
53.9 to 58.8
5.5 to 6.0
39.8 to 43.4
*Connecting Rod Bolts
M6 x 0.75
26.5 to 30.4
2.7 to 3.1
10.8 to 13.7
*Rocker Arm Bracket Bolts
M6 x 1.0
9.81 to 11.28
1.00 to 1.15
7.23 to 8.32
*Idler Gear Shaft Bolts
M6 x 1.0
9.81 to 11.28
1.00 to 1.15
7.23 to 8.32
Spark Plugs
M14 x 1.25
19.6 to 24.5
2.0 to 2.5
14.5 to 18.1
Drain Plugs
M12 x 1.25
32.4 to 37.3
3.3 to 3.8
23.9 to 27.5
Oil Switch Taper Bolt
PT 1/8
14.7 to 19.6
1.5 to 2.0
10.8 to 14.5
*Crankshaft Bolt
M12 x 1.5
98.1 to 107.9
10.0 to 11.0
72.3 to 79.6
For "*" marked bolts and nuts in the table, apply engine oil to their threads and seats before
tightening.
Screw and bolt material grades are shown by numbers punched on the screw and bolt heads.
C-2005
STANDARD HARDWARE & TORQUE VALUES
