Lesson 5/Learning Event
USING THE TORQUE WRENCH
To use a torque wrench, set the specification on the micrometer handle or
note the specification on the scale or dial. Attach the proper socket to
the torque wrench. Place the socket on the nut or bolt to be tightened.
If an assembly containing many bolts or nuts is to be torqued, it is good
practice to use the following three-step procedure:
1. First, torque
all
the
bolts
to
about
three-quarters
of
the
specification.
2. Recheck the specification and the torque wrench setting.
Then,
apply the specified torque to each bolt.
3. Finally, retorque all bolts to the specification, to be sure that
none were missed in the final torquing.
Use a smooth, steady pulling motion with a torque wrench. A fast or a jerky
motion will cause the fastener to be tightened to an incorrect torque. Be
sure to follow the torque specification for each fastener.
Look for
footnotes, in the specification charts, that indicate whether the threads
are to be dry or lubricated with an antiseize compound.
When you are
tightening parts such as cylinder heads or intake manifolds, always find and
follow the recommended bolt tightening pattern, Figure 66.
FIGURE 66.
MW24 B CYLINDER HEAD BOLT TORQUE SEQUENCE
86
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