Filter
Top Products
CRANKSHAFT/TRANSMISSION 9-19
Crankshaft and Connecting Rods
•
Install new bolts in reused connecting rods.
•
Dent both bolt head and bolt tip with a punch as shown.
•
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].
•
Apply a small amount of molybdenum disulfide oil solution
to the following.
Threads of Nuts and Bolts
Seating Surfaces of Nuts and Connecting rods
•
Tighten the big end nuts until the bolt elongation reaches
the length specified in the table.
•
Check the length of the connecting rod bolts.
If the stretch is more than the usable range, the bolt has
stretched too m uch. An overelongated bolt may break in
use.
Bolt Length after
tightening
–
Bolt Length before
tightening
=
Bolt Stretch
Connect-
ing Rod
Assy
Bolt Nut
Usable Range of
Connecting Rod
Bolt Stretch
Attached to
new con-rod
New
Use the bolts
attached to
new con-rod.
New
0.24 ∼ 0.34 mm
(0.0094 ∼ 0.0134
in.)
Used
Used
Replace the
bolts with new
ones.
New
0.24 ∼ 0.34 mm
(0.0094 ∼ 0.0134
in.)
(2) Rotation Angle Method
If you don’t 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
Clean the bolts, nuts and connecting rods in a well
-ventilated area, and take care that there is no spark
or flame anywhere near the w orking area. This in-
cludes any appliance with a pilot light. Because of
the danger or highly flammable liquids, do not use
gasoline or low-flash point solvents to clean them.
CAUTION
Immediately dry the bolts and nuts with com-
pressed air after cleaning.
Clean and dry the bolts and nuts completely.
www.zxforums.com
www.zxforums.com
www.zxforums.com
www.zxforums.com
www.zxforums.com
www.zxforums.com
www.zxforums.com