Yanmar 4JH45 Specifications download pdf (Page 64)

PERIODIC MAINTENANCE

58 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).

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

4JH45_4JH57_4JH80_4JH110_EN_OPM.book 58 ページ２０１３年１０月８日　火曜日　午後３時５８分

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Yanmar 4JH45 Specifications Page 64