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CRANKSHAFT/TRANSMISSION 9-19
Crankshaft and Connecting Rods
•
Install new bolts and nuts in reused connecting rod.
If the connecting rod assy was replaced, use the bolts and
nuts attached to the new connecting rod assy.
•
Apply a small amount of molybdenum disulfide oil solution
to the following portions.
Threads [A] of Bolts and Nuts
Seating Surfaces [B] of Nuts and Connecting Rod Caps
•
Dent both bolt head and bolt tip with a punch as shown in
the figure.
•
Before tightening, use a point micrometer to measure the
length of new connecting rod bolts and record the values
to find the bolt stretch.
Connecting Rod [A]
Dent here with a punch [B].
Nuts [C]
Fit micrometer pins into dents [D].
•
Tighten the big end nuts until the bolt elongation reaches
the length specified as follows.
Bolt Length after
tightening
–
Bolt Length before
tightening
=
Bolt Stretch
Connecting Rod Bolt Stretch
Usable Range: 0.20
∼ 0.32 mm (0.0079 ∼ 0.0126 in.)
•
Check the length of the connecting rod bolts.
If the stretch is more than the usable range, the bolt has
stretched too much. An overelongated bolt may break in
use.
(2) Rotation Angle Method
If you do not have a point micrometer, you may tighten
the nuts using the “Rotation Angle Method”.
•
Be sure to clean the bolts, nuts and connecting rods thor-
oughly with a high-flash point solvent, because the new
connecting rods, bolts and nuts are treated with an anti
-rust solution.
WARNING
Gasoline and low flash-point solvents can be
flammable and/or explosive and cause severe
burns. Clean the bolts, nuts, and connecting rods
in a well-ventilated area, and take care that there
are no sparks or flame anywhere near the working
area; this includes any appliance with a pilot light.
Do not use gasoline or a low flash-point solvent to
clean them.
NOTICE
Immediately dry the bolts and nuts with com-
pressed air after cleaning.
Clean and dry the bolts and nuts completely.
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