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 TM 55-1905-220-14-7
3-171.1. PISTON - MAINTENANCE INSTRUCTIONS (Continued).
c. The piston is cooled by a spray of lubricating oil directed at the underside of the piston head from a
nozzle in the top of the connecting rod, by fresh air from the blower to the top of the piston and indirectly by the
water jacket around the cylinder.
d. Each piston is balanced to close limits by machining a balancing rib, provided on the inside at the bottom
of the piston skirt.
e. Two bushings, with helical grooved oil passages, are pressed into the piston to provide a bearing for the
hardened, floating piston pin. After the piston pin has been installed, the hole in the piston at each end of the
pin is sealed with a steel retainer. Thus, lubricating oil returning from the sprayed underside of the piston head
and working it way through the grooves in the piston pin bushings, is prevented from reaching the cylinder
walls.
f. Each piston is fitted with compression rings and oil control rings. Eight equally spaced drilled holes just
below each oil control ring groove permit excess oil, scraped from the cylinder walls, to return to the crankcase.
3-2876
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