
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. When
working on critical components that require
calibrated tools, special procedures and
specific tightening sequences, consult with
your Yanmar distributor or dealer.
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.
Bolt diameter x pitch
(mm)
M6x1.0 M8x1.25 M10x1.5 M12x1.75 M14x1.5 M16x1.5
Tightening
Torque
N·m 11.0 ± 1.0 26.0 ± 3.0 50.0 ± 5.0 90.0 ± 10.0 140.0 ± 10.0 230.0 ± 10.0
kgf·m 1.1 ± 0.1 2.7 ± 0.3 5.1 ± 0.5 9.2 ± 1.0 14.3 ± 1.0 23.5 ± 1.0
lb-ft 8.0 ± 0.7 19.0 ± 2.1 37 ± 3.6 66.0 ± 7.2 103 ± 7.2 170 ± 7.2
lb-in — — — — — —
PERIODIC MAINTENANCE
44 GM Series Operation Manual
© 2007 Yanmar Marine International
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