On the top of the piston, you’ll find three or four grooves cast into the metal. Inside the grooves piston rings are put in. The piston rings are the part that actually touch the walls of the cylinder. They are made from iron and come in two varieties: compression rings and oil rings. The compression rings are the top rings and they press outward on the walls of the cylinder to provide a strong seal for the combustion chamber. The oil ring is the bottom ring on a piston and it prevents oil from the crankcase from seeping into the combustion chamber. It also wipes excess oil down the cylinder walls and back into the crankcase.
A wiring harness in the engine is a set of wires, connectors, and terminals which run all over the vehicle for relaying electric power and information. The harness plays an integral role in connecting a number of important components of a vehicle. The wiring harness is just like the central nervous and circulatory system of a human body which pass information and power throughout the body.
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