Abstract: A cylinder head gasket prepared by a method of the invention is installed between a cylinder head and a cylinder block. In the method, a plate is prepared at first to have at least one hole smaller than a hole of the engine to be sealed. The first plate is bent around the first hole so that the first plate is provided with a curved portion defining a hole corresponding to the hole of the engine, a flange extending away from the curved portion, and a space around the curved portion. The curved portion is compressed to eliminate the space to thereby form a solid portion by the flange and an annular portion. A second plate having a hole larger than the flange is prepared and is assembled with the first plate. The second plate is located at a side opposite to the flange of the first plate. The second plate does not laminate the flange of the first plate.

Abstract: A gasket of the invention is installed between two engine parts of an internal combustion engine. The gasket may be formed of one metal plate including at least one first hole, at least one sealing device formed around the first hole, and a plurality of bolt holes for attaching the gasket to the engine. The metal plate further includes at least one second hole situated adjacent to the first hole between the two bolt holes, and a bead around the second hole. The second hole is arranged such that a substantial portion of the second hole is located outside an imaginary line linking between centers of the two bolt holes adjacent to each other. The bead includes an inner section near the first hole having spring constant weaker than a remainder of the bead. Therefore, when the metal plate is tightened between the engine parts, the bead can be compressed equally to securely seal around the second hole. The metal plate may be combined with other metal plates to constitute a steel laminate gasket.

Abstract: A steel laminate gasket is used for an internal combustion engine having at least one hole therein. The gasket comprises a main plate, and at least one pressure regulation plate. The main plate includes a base section having at least one first opening corresponding to the hole of the engine, a flange situated over the base section around the first opening, and a curved portion situated between the flange and the base section adjacent to the first opening. The curved portion has resiliency to seal around the first opening when the gasket is tightened. The base section, flange and curved portion are integrally formed together. The pressure regulation plate is placed over the base section and includes at least one second opening. The diameter of the second opening is larger than the diameter of the flange so that the pressure reglation plate can be directly placed over the base section without laying over the flange.

Abstract: A steel laminate gasket of the invention is installed in an internal combustion engine having at least one hole therein. The gasket comprises a first metal plate, and a second metal plate situated under the first metal plate. The first plate includes a first sealing device around a first hole to be sealed, and an embossed portion between the first sealing device and a base portion of the first plate. The second plate has a second hole larger than the first sealing device, and a second sealing device around the second hole. When the first and second plates are assembled, the second plate does not pile the first sealing device. The gasket is securely sealed by the combination of the first and second sealing devices and the embossed portion.

Abstract: A metal laminate gasket of the invention is installed in an internal combustion engine having at least one hole therein. The gasket comprises a first metal plate, and a second metal plate situated under the first metal plate. The first plate includes a first sealing device around a first hole to be sealed, and an inclined portion between the first sealing device and a base portion of the first plate. The upper surface of the base section is located in a level lower than the upper surface of the first sealing device. The second plate has a second hole larger than the first sealing device, and a second sealing device around the second hole. When the first and second plates are assembled, the second plate does not pile over the first sealing device. When the gasket is tightened, the second sealing device is at first compressed by tightening force and deforming force of the inclined portion to thereby equally tighten the second sealing device.

Abstract: A metal laminate gasket of the invention is installed in an internal combustion engine having at least one hole therein. The gasket comprises a first metal plate, a second metal plate situated under the first metal plate, and a thin graphite layer attached to the second plate to face outwardly. The first plate includes a curved portion to define a first hole corresponding to the hole of the engine, and a flange around the first hole. The second plate has a second hole larger than the flange, so that when the first and second plates are assembled, the second plate does not pile the flange. The graphite layer fills dents or small scratches on an engine part when the gasket is installed in the engine.

Abstract: A clip of the invention is designed to attach a gasket to a gasket attaching portion of an engine part. The clip comprises a body, a projection formed at a first end portion of the body, and an engaging portion formed at a second end portion of the body. The projection extends substantially perpendicularly to the body, and the engaging portion extends in the same direction as in the projection. When the gasket is attached to the gasket attaching portion, the projection engages the gasket and the engaging portion engages the gasket attaching portion of the engine part. The gasket can be easily installed between the two engine parts.

Abstract: A positioning pin of the invention is attached to an engine part for installing a gasket thereon. The positioning pin includes a body having a projection extending outwardly from the engine part. The projection includes at least one large diameter portion, and a small diameter portion about the body. When the gasket is accidentally moved on the engine part to slip out of the positioning pin, the gasket engages the small diameter portion or is blocked by the large diameter portion to prevent accidental disengagement of the gasket from the engine part.

Abstract: The metal gasket of the invention is installed in an internal combustion engine. The engine includes a plurality of cylinder bores and bolt holes, and at least first and second fluid holes. The first fluid hole is located in an area surrounded by imaginary lines linking between the centers of the bolt holes along the outer periphery of the gasket, and the second fluid hole is located outside the area surrounded by the imaginary lines. The gasket is basically formed of a first metal plate and includes a plurality of holes corresponding to the cylinder bores, bolt holes and first and second fluid holes. The first metal plate includes a first bead around the first fluid hole, and a second bead around the second fluid hole. The height of the second bead may be less than the height of the first bead. The second bead may have a spring constant less than that of the first bead. Therefore, when the gasket is tightened, the first bead is sufficiently compressed to seal around the same.

Abstract: A positioning device of the invention is attached to an engine part for installing a gasket thereon. The positioning device includes a positioning pin with an annular depression adjacent a top end thereof, and a top plate fixed to the top end of the positioning pin. A space is defined by the top plate and the annular depression. When the gasket is moved on the engine part, the gasket is held in the space and is blocked by the top plate to prevent accidental disengagement of the gasket from the engine part.

Abstract: A steel laminate gasket is used for an internal combustion engine having at least one hole therein. The gasket comprises a main plate, and at least one pressure regulation plate. The main plate includes a base section having at least one first opening corresponding to the hole of the engine, a flange situated over the base section around the first opening, and a curved portion situated between the flange and the base section adjacent to the first opening. The curved portion has resiliency to seal around the first opening when the gasket is tightened. The base section, flange and curved portion are integrally formed together. The pressure regulation plate is placed over the base section and includes at least one second opening. The diameter of the second opening is larger than the diameter of the flange so that the pressure regulation plate can be directly placed over the base section without laying over the flange.

Abstract: A steel laminate gasket of the invention is installed in an internal combustion engine having at least one hole therein. The gasket comprises a first plate and a second plate situated under the first plate. The first plate includes at least one first hole corresponding to the hole of the engine, a base portion, at least one curved portion and at least one flange situated above the base portion. The curved portion and flange are integrally formed with the base portion. A side wall is formed on one of the base portion and the flange to form an embossed portion thereat. Also, a bead is formed on the embossed portion to thereby provide a sealing pressure stronger than the embossed portion when the gasket is tightened.

Abstract: A steel laminate gasket of the invention is installed in an internal combustion engine having at least one hole therein. The gasket comprises a first plate having at least one first hole therein corresponding to the hole of the engine, and a second plate having at least one second hole. The first plate is provided with a base portion, at least one curved portion adjacent the first hole, and at least one flange situated parallel to the base portion. The base portion, curved portion and flange are integrally formed together. At least one side wall is formed on one of the base portion and the flange adjacent the curved portion to surround the first hole. The thickness between the flange and base portion inside the side wall is greater than the thickness between the flange and base portion outside the side wall so that an embossed portion is formed around the first hole. The second plate is situated adjacent the first plate so that the second plate does not pile the flange of the first plate.

Abstract: A steel laminate gasket of the invention to be used for an internal combustion engine comprises a first plate and a second plate situated adjacent to the first plate. The first plate is provided with a first base section, first and second openings formed in the first base section and a first sealing structure integrally formed with the first base section around the first opening. The second plate is provided with a second base section placed over the first base section, a third opening formed in the second base section to be situated around the first opening, a fourth opening formed in the second base section, and a second sealing structure integrally formed with the second base section around the fourth opening. When the first and second plates are assembled, the first and second sealing structures do not lay over the second and first plates respectively and seal around holes of the engine.

Abstract: A steel laminate gasket designed to efficiently seal engine parts having high and non-high pressure areas. The gasket comprises a core plate extending throughout entire area of the engine to be sealed, at least one metal plate situated above the core plate, and at least one soft sheet situated above the core plate. The metal plate is placed adjacent to the high pressure areas of the engine so that the high pressure areas of the engine are sealed by the core plate and the metal plate. The soft sheet is made of a soft gasket material and is placed adjacent to the non-high pressure area so that the non-high pressure areas of the engine are sealed by the core plate and the soft sheet.