TM 5-4320-302-14
6-17.
CONNECTING ROD ASSEMBLY (CONT)
Location/Item
Action
Remarks
2.
Small-end
a.
Adjust inside micrometer to 1.3780 inches
bush
(35.0 mm).
b.
Measure and record small-end bush bore or inside
diameter. Measure bush at points 1 and 2 along axis A
and B. Measurements should be 1.3794 to 1.3811
inches (35.036 to 35.080 mm). If any measurement is
outside these limits, replace small-end bush.
3.
Piston pin
Measure and record diameter of corresponding
piston pin with micrometer at several points along
the length of the pin. The diameter should be
1.3777 to 1.3780 inches (34.994 to 35.0 mm). If any
measurement is outside these limits, replace piston
pin.
4.
Piston pin
Determine
piston
pin
clearance
in
small-end
clearance bush. Subtract piston pin diameter
measured in step 4 from small-end bush bore
measurement recorded in step 3. Clearance should
be 0.0014 to 0.0034 inch (0.036 to 0.086 mm) under
normal conditions. If it is greater than 0.0098 inch
(0.25 mm), piston pin and small-end bush should be
remeasured
and
clearance
redetermined.
If
clearance is still greater than 0.0098 inch (0.25
mm), replace piston pin or small-end bush, or both.
Be sure to recheck measurements and clearances
to see that they fall within their respective tolerance
limits.
6-125
