Abstract: A gasket made of a fibrous and/or porous material is impregnated with a liquid saturating agent consisting essentially of an organic, synthetic and completely polymerizable liquid that does not contain agents which will evaporate during polymerization of the liquid.

Abstract: A spacer-expander member for holding one or two cylinder-engaging rails in a groove in a piston is formed to present a plurality of radially inwardly-directed spacer feet which are so located that they engage the groove bottom in a region spaced from the groove sides.

Abstract: An axially and radially clamping spreader ring for an oil scraper piston ring, comprises a profiled metal band which has been made resilient in the circumferential direction by corrugations and/or cuts. The two ends of the metal band abut against one another and the metal band is provided in the area of one side with axial and radial supporting faces to accommodate at least one band-shaped scraper ring. A plurality of radially outwardly extending protrusions are distributed over the circumference of the band in the vicinity of the side of the spreader ring which is axially opposite the side which accommodates the scraper ring. The protrusions are separated from one another by wide lubricating channels and, when installed, contact the cylinder wall.

Abstract: A piston ring formed of an annular, cross-sectionally bent metal strip has a series of circumferentially distributed slots extending in a generally axial orientation from edges of the strip. The slots are in an overlapping relationship when viewed circumferentially for defining a series of circumferential, resilient webs. The webs have web portions that are readily deformable to bending forces.

Abstract: An expander spring for supporting an oil scraper ring in a groove of a piston is constituted by a sheet metal ring having an axis and forming an annular channel of generally U-shaped cross section. The channel has two side walls, forming, respectively, a radially inner and a radially outer, axially oriented side of the expander spring. The channel further has a base interconnecting the side walls and an open side opposite the base. A plurality of circumferentially distributed slots are provided in the side walls for increasing the resiliency of the expander spring in the circumferential direction, and a plurality of axially projecting support feet are carried by the free end of the radially inner side of the expander spring for supporting at least one oil scraper ring.

Abstract: A cylinder head gasket for internal combustion engines comprises at least one layer of a soft material having pores which are enriched with an impregnating agent and edges which are bordered by a casing. The pores of the soft material underneath the flange are kept free of impregnating agent.