Piston ring sets

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Piston ring sets

KS Kolbenschmidt piston ring sets are an important component for reconditioning engines. For intermediate reconditioning of engines with liners we recommend to check further usability of the pistons and to replace the piston rings and cylinder liners. This ensures run-in of the piston rings with the sliding surface of the cylinder liner.

In general, a distinction is made between compression rings, scraper rings and oil control rings. They all have the primary task to seal off combustion chamber and crankcase against each other. The compression rings are to prevent combustion gases from getting into the crankcase from the combustion chamber. Scraper rings combine the function of the compression rings and the oil control rings; so in essence they keep combustion gases away from the crankcase and wipe off excess oil on the cylinder wall.

The task of the oil control rings is to scrape off the excess oil from the cylinder wall  to limit and to limit entry of the lubricating oil into the
combustion chamber as much as possible. The aim is to achieve low oil consumption  an sufficient lubrication of moving parts and at the same time entry of gas as little as possible.

Another important task of the rings is the conduction of a proportion of the piston heat to the cooled cylinder wall. The first ring is responsible for the main proportion, the following rings take a smaller proportion. Inertial and gas forces as well as high temperatures
make high technical demands on the piston rings. An optimum service life
and compliance with exhaust gas legislation can only be achieved through
accurate adaptation to the respective engine.

Surface coatings

Chromium-plated piston ring sliding surfaces reduce the wear of the interacting sliding parts and increase durability.

Molybdenum-coated rings offer maximum temperature resistance and very good emergency running properties.

Piston rings with chrome ceramic coatings reduce cylinder wear and ensure maximum durability.

Spherically lapped piston ring sliding surfaces shorten the run-in time and ensure the best sliding properties right from the start.

Keystone-shaped compression rings prevent ring sticking in the grooves and
ensure trouble-free operation.

Each type of piston ring can be specialised for different applications by varied shaping of the front and back of the ring.

AbbreviationName
CK

Chromium-ceramics

CRSliding surface chrome-plated
FXSliding surface ferrox-filled
MOSliding surface molybdenum-coated
NTSliding surface nitrided
PCSliding surface plasma-coated

Materials

Class acc. to
ISO 6621-3
Average
E-M (N/mm²)
Break resistant
E-M (N/mm²)
Hardness
12100 000350

95HRB

22115 000450106 HRB
23115 000450400 HV5
24115 000500108 HRB
53160 0001 30095 HRB
55160 0001 30095 HRB
61200 000-33-44 HRC