Yanmar 3JH5E - Tightening Fasteners

PERIODIC MAINTENANCE
62 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 “7” head (JIS strength classification: 7T). 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).
Main Bolt and Nuts
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 14.1 ± 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
Name
Thread Diameter
x Pitch
Lubricating Oil Application
(thread portion and
seat surface)
Torque N·m (ft-lb)
Head bolt M10x1.25 Yes 88.2 ± 3 (65.1 ± 2.2)
Con-rod bolt M9x1.0 Yes 44.1 to 49.1 (32.6 to 36.3)
Flywheel bolt M10x1.25 Yes 83.3 to 88.3 (61.5 to 65.2)
Metal cap bolt M12x1.5 Yes 98 ± 2 (72.3 ± 1.5)
Crank pulley bolt
(Material of pulley: FC300)
M14x1.5 Yes 88.2 ± 5 (65.1 ± 3.7)
Nozzle fastening bolt M8x1.25 — 26.4 ± 2 (19.5 ± 1.5)
FIP gear
fastening
bolt
3JH5E, 4JH5E M8x1.0 — 34.3 ± 2 (25.3 ± 1.5)
4JH4-TE
4JH4-HTE1
4JH4-HTE
M14x1.5 Yes 64 ± 5 (41.6 ± 3.7)
High pressure pipe nut M12x1.5 — 29.4 to 34.4 (21.7 to 25.4)
Starter relay nut M6x1 — 3.6 ± 0.6 (2.7 ± 0.4)
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