Tightening Fasteners - Yanmar 3JH5E Operation Manual

PERIODIC MAINTENANCE

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
he tightening torque in the Standard Torque Chart should be applied only to the
bolts with a "7" head (JIS strength classification: 7T). Apply 60% torque to bolts
that are not listed. Apply 80% torque when tightened to aluminum alloy.
Bolt Diameter x
Pitch (mm)
Tightening N·m
Torque
ft-lb
Taper Plugs
Tightening N·m
Torque
ft-lb
When lock adhesive is applied, decide separately.
Pipe Joint Bolts
Tightening N·m
Torque
ft-lb
When seal washer applied, torque is 34 ± 5 N·m (25.1 ± 3.7 ft-lb).
Main Bolt and Nuts
Name
Head bolt
Con-rod bolt
Flywheel bolt
Metal cap bolt
Crank pulley bolt
(Material of pulley: FC300)
Nozzle fastening bolt
FIP gear 3JH5E, 4JH5E
fastening
4JH4-TE
bolt
4JH4-HTE1
4JH4-HTE
High pressure pipe nut
Starter relay nut
62
M6x1.0 M8x1.25
10.8 ± 1.0 25.5 ± 3.0
8.0 ± 0.7 18.8 ± 2.2
1/8
9.8
7.4
M8 M10
14.7 ± 2 22.5 ± 3
10.9 ± 1.5 16.6 ± 2.2
Thread Diameter
x Pitch
M10x1.25
M9x1.0
M10x1.25
M12x1.5
M14x1.5
M8x1.25
M8x1.0
M14x1.5
M12x1.5
M6x1
M10x1.5 M12x1.75
49 ± 5.0 88.2 ± 10.0
36.2 ± 3.7 65.1 ± 7.4
1/4 3/8
19.6 29.4
14.5 21.7
M12
29.4 ± 5
21.7 ± 3.7
Lubricating Oil Application
(thread portion and
seat surface)
Yes
Yes
Yes
Yes
Yes
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Yes
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JH Series Operation Manual
M14x1.5 M16x1.5
140.0 ± 10.0 230.0 ± 10.0
103 ± 7.2 170 ± 7.2
1/2
58.8
43.2
M14 M16
14.1 ± 5 53.9 ± 5
32.6 ± 3.7 69.8 ± 3.7
Torque N·m (ft-lb)
88.2 ± 3 (65.1 ± 2.2)
44.1 to 49.1 (32.6 to 36.3)
83.3 to 88.3 (61.5 to 65.2)
98 ± 2 (72.3 ± 1.5)
88.2 ± 5 (65.1 ± 3.7)
26.4 ± 2 (19.5 ± 1.5)
34.3 ± 2 (25.3 ± 1.5)
64 ± 5 (41.6 ± 3.7)
29.4 to 34.4 (21.7 to 25.4)
3.6 ± 0.6 (2.7 ± 0.4)