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 TM 55-1925-204-12
(c) Compress piston rings with a ring compressor.
(f) Remove the cylinder from case by removing the
(d) Lower bearing end of connecting rod into cylinder
six capscrews securing it.
and tap piston into the cylinder making sure connecting rod
(3) Disassembly.
bearing hits squarely on the crankshaft journal.
(a) Clamp connecting rod in a vise, piston up.
(e) Replace the connecting rod bearing cap and
(b) Remove rings from piston, noting that the
tighten to 40 foot-pounds.
compression ring is on top, scraper ring, next (there are two
(f) Replace both connecting rods and pistons in the
scraper rings on the high pressure piston) and the oil ring, at
above manner.
bottom.
(g) Replace inspection plate on block.
(4) Cleaning, inspection, and repair.
(h) Replace cylinder head; tighten bolts to 35 foot-
(a) Remove old oil from ring grooves and clean all
pound torque.
oilholes in piston.
(i) Replace line leading from centrifugal unloader to
(b) The connecting rod bearing load is on the upper
diaphragm unloader (fig. 5-97).
shell only. Any wear, therefore, will appear on examination of
c. Drive Belts.
the upper shell. Check for scoring, chipping, corrosion,
(1) General. There are three drive belts which transfer
cracking, or signs of overheating. Inspect backs of bearing
power from motor to compressor. These belts come in
shells for bright spots. Bright spots indicate that shells have
matched sets. When replacing, always replace complete set.
been moving in their supports and are unfit for further use.
(2) Maintenance and adjustment . Do not run belts under
Replace bearing shells if any of the above conditions exist.
excessive tension. Adjust for 1/2 inch firm slack in a belt at a
(5) Assembly.
point midway between the motor and compressor pulleys.
(a) Clamp connecting rod in a vise, piston up.
Adjust by loosening motor mounting capscrews (fig. 5-102)
(b) Replace rings on piston. Install new rings
and moving motor in direction necessary to provide required
whenever, the compressor is overhauled. Position oil ring first,
slack. Belts are replaced by loosening motor mounts and
then scraper ring (high pressure piston has two scraper rings),
sliding motor toward compressor enough to permit removal of
and uppermost compression ring.
belt. Install new belts and adjust. Always realign pulleys after
(6) Installation.
belts have been adjusted.
(a) Position a new gasket between cylinder and case.
Replace cylinder and tighten bolts.
(b) Position upper bearing shell in connecting rod.
5-139
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