I\& CD 28636
Figure 26 -
10. CONNECTING ROD AND PISTON ASSEMBLY.
a. Disassembly. Remove the piston rings with a standard ring
remover. Remove the piston pin lock screw, and push the piston pin
out of the piston.
b. Cleaning. Scrape the carbon from the ring grooves in the piston,
and from the dome. Remove all foreign matter from the oil holes in
the oil ring (lower) groove. Clean the complete assembly in dry-clean-
ing solvent.
c. Inspection and Repair. Pistons with cracks, scores, or damage
of any kind must be replaced Determine the wear on the skirt of each
piston at the bottom at right angles to the piston pin. If the wear is 0.010
inch less than the original size, or if the piston is out-of-round more than
0.005 inch, the piston must be replaced. Check the width of the ring
grooves with new rings and a feeler gage (fig. 20). If the piston ring
groove wear exceeds 0.003~inch clearance between the piston ring and
ring groove, the piston must be replaced. Measure the piston pin hole.
If the inside diameter of the piston pin hole is more than 0.813 inch,
the piston must be repiaced. pins -worn ~0
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