TM 10-4320-307-24
4-16
CONNECTING ROD AND PISTON ASSEMBLY REPLACE REPAIR CONT.
c.
Measure piston outside diameter at approximately 1
inch (25.4 mm) below bottom ring groove, at right
angles to piston pin bore. Replace any piston that
measures less than 5.483 inches (139.27 mm).
NOTE
Piston temperature must be between 70 and 90°F
(21 ° and 32°C).
d.
Measure piston pin bore (3) as shown. Replace piston
if bore does not measure between 1.9985 and 2.000
inches (50.762 and 50.800 mm).
NOTE
Piston temperature must be 68°F (20°C). Add 0.0005 inch (0.013 mm) to the bore inside
diameter per 10°F (5C) temperature rise up to 90°F (32°C).
12. Measure piston pin outside diameter. Replace pin if diameter is not between 1.9985 and 1.9990 inches (50.762 and
50.775 mm), or if pin is more than 0.001 inch (0.03 mm) out of round.
13. Measure connecting rods as follows:
CAUTION
The cap number must match the number on the connecting rod and installed with
numbers aligned to prevent damage to rods and caps.
a.
Assemble connecting assemblies (6) with capscrews
(8). Tighten capscrews alternately to 75 ft-lbs (100
N•m). Then tighten alternately to 170 ft-lbs (230 Nm).
b.
Measure piston pin bushing (7) inside diameter.
Replace any bushing that does not measure between
2.0010 and 2.0022 inches (50.825 and 50.856 mm).
Refer to step 19.
c.
Measure rod crankshaft bore inside diameter. Replace
or machine rod if bore does not measure between
3.3157 and 3.3167 inches (84.219 and 84.244 mm).
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