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Page 174
REPAIR INSTRUCTIONS
SPECIAL TOOLS REQUIRED
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Piston Pin Bushing Remover/Installer
J 37717
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Piston Pin Burnishing Broach J 37718
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Connecting Rod Fixture 945-6041
INSPECTION
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Inspect the connecting rods for nicks,
cracks, signs of overheating, or bends or
twisting that can cause rod failure.
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Inspect bolt holes for elongation or pulled
threads.
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Check mating surfaces between the rod and
cap for correct fit.
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Inspect the crankshaft journal bearing
surface and wrist pin bushing.
If any of the above parts are suspected of being
faulty, replace the connecting rod.
If it is determined that the condition of any part or
component is questionable or is at the limit of
tolerance, replace it. If the questionable part or
component is reused, it may fail or become out of
tolerance after a short time in operation. It is cost-
efficient to replace components when rebuilding.
Use genuine MACK replacement parts.
WRIST PIN BUSHING REPLACEMENT
If the wrist pin bushing is found to be out of
tolerance, it should be replaced.
Refer to Figure 166.
To replace the bushing:
1. Position the rod in a press with the piston pin
bushing remover/installer J 37717 inserted
into the wrist pin bushing.
2. Press the bushing out of the rod.
Use care not to twist or bend the connecting rod
while pressing the bushing.
166
Figure 166 — Wrist Pin Bushing Removal
Wrist Pin Bushing Installation
The wrist pin bushing has a lubrication hole
through it. This hole MUST be aligned with the
rifle-drilled hole in the rod to allow oil flow to the
wrist pin. If the holes are not aligned, wrist pin,
piston, and connecting rod failure will result.
1. Position the rod and wrist pin bushing
remover/installer J 37717 in a press, and
press the new bushing into the rod.
2. Align the hole in the bushing with the rifle-
drilled hole in the rod.
Refer to Figure 167.
3. Position the rod assembly in a press with
wrist pin bushing burnishing broach J 37718.
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