Piston rings maintain combustion pressure in the cylinder and prevent oil from seeping into the combustion chamber.
Ring failure results in
To verify the need for piston ring maintenance, the technician uses a compression tester to check for low compression readings. The technician may also refine the check by squirting some medium-weight oil into each plug hole, cranking the engine, and repeating the compression test.
If the readings are significantly higher, there is a problem with the rings or cylinder. If no changes are evident, the trouble is with the valves.
A significant drop in pressure in one or more cylinders can be indicative of several problems, including a blown head gasket.
TIP: A broken compression ring may produce a misfire in the affected cylinder.
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