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Piston Rings
The job of the rings is to fill the space between the
piston and the cylinder walls.
The combustion chamber is sealed by a thin film of
oil between the rings and the piston and between the
rings and the cylinder wall.
Usually constructed of cast iron.
The total number of rings per piston can vary, but
there are three types of rings on each piston.
Compression
Subject to the greatest amount of chemical corrosion
and highest temperatures.
Transfers 70% of combustion heat from piston to
cylinder walls.
Wiper ring
Meters oil film on cylinder walls
Must be installed correctly.
Oil ring
Constructed of two thin rails with holes or slots cut in
between.
Has the highest pressure against the cylinder wall of
the three rings.
Cylinder Bore
Three types
Cast aluminum
Cast aluminum with cast iron sleeve
Cast iron
Usually use a cross-hatch finish to improves ring
lubrication
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