Yanmar 6LT Series, Operation Manual, Page: 45 / 76

INSPECTION AND MAINTENANCE
6LT Series Operation Manual 41
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).
8.8
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 18.8 ± 2.2 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