Originally posted by DennyW
FREEZE!! Please put the tools down. Step... away... from the machine.
Sorry, couldn't help it.


Definition: An open-ended ring that fits into a groove on the outer diameter of the piston. Its chief function is to form a seal between the piston and cylinder wall. Most automotive pistons have three rings: two for compression sealing; one for oil sealing.

ps- and wont run without them.