Crankshaft and Connecting Rods
The connecting rod big end is bolted using the "plastic
region fastening method".
This method precisely achieves the needed clamping
force without exceeding it unnecessarily, allowing the
use of thinner, lighter bolts further decreasing connecting
There are two types of the plastic region fastening. One is
a bolt length measurement method and other is a rotation
angle method. Observe one of the following two, but the
bolt length measurement method is preferable because
this is a more reliable way to tighten the big end nuts.
The connecting rod bolts are designed to stretch
when tightened. Never reuse the connecting rod
bolts. See the table below for correct bolt and nut
Be careful not to overtighten the nuts.
The bolts must be positioned on the seating surface
correctly to prevent the bolt heads from hitting the
(1) Bolt Length Measurement Method
Be sure to clean the bolts, nuts, and connecting rods
thoroughly with a high flash-point solvent, because the
new connecting rods, bolts, and nuts are treated with an
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
Immediately dry the bolts and nuts with com-
pressed air after cleaning.
Clean and dry the bolts and nuts completely.