Piston ring: A thin, flexible ring that is fitted around the piston to seal the combustion chamber and prevent the escape of gases.
Piston pin: A cylindrical metal pin that connects the piston to the connecting rod.
Wrist pin: Same as piston pin.
Connecting rod: A metal rod that connects the piston to the crankshaft.
Crankshaft: A metal shaft that converts the reciprocating motion of the piston into rotary motion.
Main bearing: A bearing that supports the crankshaft at its ends.
Connecting rod bearing: A bearing that supports the connecting rod at its connection to the crankshaft.
Piston skirt: The lower part of the piston that extends below the piston rings.
Piston crown: The upper part of the piston that is exposed to the combustion gases.
Piston head: Same as piston crown.
Piston dome: A raised portion of the piston crown that helps to direct the flow of air and fuel into the cylinder.
Piston dish: A concave area in the piston crown that helps to increase the compression ratio.
Piston ring groove: A groove in the piston that holds the piston rings.
