PISTONS, CONNECTING RODS, AND LINERS .
Connecting Rod Bearings
6-27.1. PISTON - MAINTENANCE INSTRUCTIONS .
a. The trunk-type malleable iron piston is plated with a protective coating of tin which permits close fitting, reduces
scuffing and prolongs piston life. The top of the piston forms the combustion chamber bowl and is designed to compress
the air into the close proximity to the fuel spray.
b. Each piston is internally braced with fin-shaped ribs and circular struts, scientifically designed to draw heat
rapidly from the piston crown and transfer it to the lubricating oil spray to ensure better control of piston ring temperature.
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
d. Each piston is balanced to close limits by machining a bala cing rib, provided on the inside at the bottom of the