PERIODIC MAINTENANCE
108
JH Series Operation Manual
Tightening Fasteners
Use the correct amount of torque when you tighten fasteners on the engine.
Applying excessive torque may damage the fastener or component and not enough
torque may cause a leak or component failure.
NOTICE
The tightening torque in the Standard Torque Chart should be applied only to the
bolts with a “8.8” head (JIS strength classification: 8.8). Apply 60% torque to
bolts that are not listed. Apply 80% torque when tightened to aluminum alloy.
When lock adhesive is applied, decide separately.
When seal washer applied, torque is 34 ± 5 N
·
m (25.1 ± 3.7 ft-lb).
Bolt Diameter x
Pitch (mm)
M6x1.0
M8x1.25
M10x1.5
M12x1.75
M14x1.5
M16x1.5
Tightening
Torque
N
·
m
10.8 ± 1.0
25.5 ± 3.0
49 ± 5.0
88.2 ± 10.0
140.0 ± 10.0
230.0 ± 10.0
ft-lb
8.0 ± 0.7
18.8 ± 2.2
36.2 ± 3.7
65.1 ± 7.4
103 ± 7.2
170 ± 7.2
Taper Plugs
1/8
1/4
3/8
1/2
Tightening
Torque
N
·
m
9.8
19.6
29.4
58.8
ft-lb
7.4
14.5
21.7
43.2
Pipe Joint Bolts
M8
M10
M12
M14
M16
Tightening
Torque
N
·
m
14.7 ± 2
22.5 ± 3
29.4 ± 5
44.1 ± 5
53.9 ± 5
ft-lb
10.9 ± 1.5
16.6 ± 2.2
21.7 ± 3.7
32.6 ± 3.7
69.8 ± 3.7
8.8
3JH40_4JH45_4JH57_4JH80_4JH110_EN_OPM.book 108 ページ ２０２２年９月２２日 木曜日 午後６時１７分
