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224
Piston Pins
1. Inspect piston pins for corrosion, nicks, and
obvious wear.
Do not use pins with nicks or
heavy scratches with the two-piece steel crown.
Engine failure will result. Install new piston pins.
Figure 314 Measuring piston pin outside
diameter
2. Use an outside micrometer to measure the
outside diameter of each piston pin at two places.
3. If the outside diameter is less than minimum
Specification (Table 31), install new piston pin.
4. Measure each piston pin bore.
5. Calculate piston pin clearance.
outside diameter of the piston pin from the inside
diameter of the piston pin bore.
NOTE: Piston pin clearance = (inside diameter
of the piston pin bore) – (outside diameter of the
piston pin)
6. If piston pin clearance in piston exceeds
Specifications (Table 31), install new connecting
rod.
Read all safety instructions in the "Safety Information" section of this manual before doing any procedures.
POWER CYLINDERS
Connecting Rods
Piston Pin Bushing
Figure 315 Measuring piston pin bushing inside
diameter
Use a telescoping gauge and an outside micrometer
to measure the inside diameter of the piston pin
bushing at two locations that are 90 degrees apart.
Record the readings.
Connecting Rod Cap Bolts
1. Inspect the connecting rod cap bolts for nicks and
thread damage. Replace the bolts as required.
Subtract the
2. Lubricate the threads of the connecting rod cap
bolts with clean engine oil. Install the cap without
the bearing shells on the connecting rod and
install the bolts by hand. Match serial numbers
on the connecting rod and cap (on same side of
fractured rod).
If resistance is met, clean the bolt holes in the
connecting rod and try installing new bolts. If
the new bolts do not turn in freely, replace the
connecting rod. The threads in the bolt holes
cannot be tapped.
3. Tighten the connecting rod cap bolts to the special
torque value (Table 33).
EGES-265-2
Follow all warnings, cautions, and notes.
© 2009 Navistar, Inc.
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