TM 5-3805-262-34
4-1. ENGINE MAINTENANCE (CONT)
g.
Pistons and Connecting Rods (Cont) .
INSTALLATION (SHEET 1 OF 3)
(1) Check connecting rod journals for wear
using micrometer. If diameters are
smaller than 2.748 inches use under-
size (0.002 inch) inserts. If connect-
ing rod journals are worn more than
0.002 inch, grind undersize to follow-
ing dimensions:
Outer Diameter
Grind
Undersize (inch)
to (inches)
0.010
2.738 to 2.739
0.020
2.728 to 2.729
0.030
2.718 to 2.719
(2)
Measure front and rear of each
crankshaft connecting rod jour-
nal using micrometer checking
taper. If taper exceeds 0.0005
inch, connecting rod journals
must be ground. Check connect-
ing rod journals 90 degrees
from first measurements for out
of roundness. If out of round-
ness exceeds 0.0005 inch, con-
necting rod journals must be
ground.
(3)
Lubricate piston (3), piston rin
6), and cylinder sleeve using cl
engine oil.
(4)
Install ring compressor on piston assembly.
NOTE
Be sure numbered side of connecting rod (2) matches cylinder number when
performing following step. Reinstall piston assembly in original
location.
Be sure stamped arrow on top of piston assembly points toward front of
engine.
(5)
Gently tap piston (3) assembly into cylinder sleeve using wooden dowel.
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