TM 5-3825-213-35
Section XV. PLOW AND CARRIER ENGINE PISTONS AND CONNECTING RODS
piston skirt at right angles to piston pins is
246. General
6.372 to 5.375 inches.
The connecting rods are drilled for pressure
lubricating to the piston pin end of the connecting rods,
(2)
Inspect the fit of each new piston ring in the
bushed with a replaceable bronze bushing.
The
grooves of the piston. The fit must be free
connecting rods and caps are matched and must not be
around the piston circumference. Refer to
interchanged or turned end-for-end. he pistons are
made of aluminum alloy and are grooved for four
(3)
Measure outside diameter of piston pins.
pistons rings.
The proper diameter is 1.499 to 1.500 inches.
If diameter is smaller than 1.497 inches
247.
Plow and Carrier Engine Pistons and
replace the piston pins.
Connecting Rods Removal and Disassembly
(4)
Inspect connecting rod bushings for scoring,
a. Removal.
scratches, and other indications of wear or
(1) Remove the plow and carrier engine
damage. The inside diameter should be
1.500 to 1.501 inches.
(2) Remove plow and carrier engine cylinder
(5)
Inspect all other parts for defective condition.
heads (par. 218).
Replace or repair worn, damaged, or
defective parts.
(3) Remove plow and carrier engine upper oil
pans (par. 228).
249. Plow and Carrier Engine Pistons and Connecting
(4) Remove the plow and carrier engine
Rods Reassembly and Installation
pistons and connecting rods as instructed
on figure 71.
a. Reassembly. Reassemble the plow and carrier
engine pistons and connecting rods in reverse of numerical
b. Disassembly. Disassemble the plow and carrier
sequence illustrated on figure 72.
engine pistons and connecting rods in the numerical
sequence as illustrated on figure 72.
b. Installation.
(1) Install the plow and carrier engine pistons
248.
Plow and Carrier Engine Pistons and
and connecting rods as instructed on figure
Connecting Rods Cleaning, Inspection, and Repair
a. Cleaning. Clean all parts with an approved
(2) Install the plow and carrier engine upper oil
cleaning solvent and dry thoroughly. Scrape carbon
pan (par. 230).
from pistons and ring lands and remove varnish from
(3) Install the plow and carrier engine cylinder
cylinder walls.
heads (par. 220).
b. Inspection and Repair.
(4) Install the plow and carrier engine (pars. 49,
(1) Measure outside of piston to determine
amount of wear. The proper diameter at
169