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 TM 55-1905-219-14-7
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
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.
3-2912
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