Yanmar 4TNV98, Service Manual

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4TNV98 & 4TNE98 Diesel Engine Section 1. General Service Information 25
Tightening Torques for Standard
Bolts and Nuts
Use the correct amount of torque when you tighten
the fasteners on the machine. Applying excessive
torque may damage the fastener or component and
not enough torque may cause a leak or component
failure.
CAUTION
The tightening torque in the Standard Torque
Chart (see General Service Information section)
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.