PISTON - MAINTENANCE INSTRUCTIONS.

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INSTALLATION (Cont)

TM-55-1905-219-14-5 Landing Craft Utility (LCU) 1667 Class Boston Hull Numbers 1667-1670 NSN 1905-00-168-5764 Manual

PISTON - MAINTENANCE INSTRUCTIONS (Cont).

TM 55-1905-219-14-5

3-96. PISTONS, CONNECTING RODS, AND LINERS.

DESCRIPTION

PARAGRAPH

Piston

Connecting Rods

Connecting Rod Bearings

Cylinder Liner

3-96.1. 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 the cylinder.

3-1642