FIGURE 24. REMOVING PISTON RINGS
When cleaning the connecting rods in solvent, in-
clude the rod bore. Blow out all passages with
compressed air.
FIGURE 25. PISTON GROOVE CLEANING
INSPECTION:
The following text contains inspection procedures
concerning pistons and connecting rods.
1.
Piston Inspection:
a. Inspect the pistons for fractures at the ring
lands,
skirts and pin bosses. Check for wear at
the ring lands using a new ring and feeler
gauge as shown in Figure 26. Replace the
piston when the side clearance of the top
compression ring reaches 0.008
inch.
b. Replace pistons showing signs of scuffing,
scoring,
worn ring lands, fractures or damage
from preignition. Excessive piston wear near
the edge of the top ring land indicates preigni-
tion.
2.
Connecting Rod Inspection:
a. Replace connecting rod bolts or nuts with
damaged threads. Replace connecting rods
with deep nicks, signs of fractures, scored
bores or bores out of round more than 0.002
inch.
b. Use a new piston pin to check connecting rod
for wear. A push fit clearance is required and
varies from engine to engine. If a new piston
pin falls through a dry rod pin bore as a result
of its own weight, replace the rod.
FIGURE 26. CHECKING RING SIDE CLEARANCE
29
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