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.
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
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