Sealing caps and method for manufacturing such sealing caps are presented wherein the sealing cap has a body (1) with a U-shaped profile with a base (9) and a perimeter wall (7) wherein the outside of the body is coated with a layer of an elastic material (5) and wherein the base is provided with a continuous convex ridge (12) adjacent the perimeter wall.

Closure element for tightly closing a bore, the closure body of which closure element can be pressed into the bore with an oversize. In order to avoid damage to the bore, the closure body is designed as a hollow body. In this way, the closure body can deform slightly as the closure body is pressed into the bore and can thereby reduce the radial pressure on the wall of the borehole. At the same time, the weight of the closure element is reduced. The closure element is preferably a hollow sphere having uniform wall thickness.

An engine cover assembly including a stud-engaging engine cover pocket plug is disclosed. The plug conceals the cover fastener assembly. The plug includes a concealing cover and a stud attachment assembly extending from the cover. The assembly comprises a bridge, a pair of spaced apart legs attached to the bridge, and a base having a stud-retaining aperture. The bridge, the pair of spaced apart legs, and the base define a parallelogram such as a rectangle. The base of the stud attachment assembly has a long axis. According to one embodiment, the base includes a pair of opposed slots extending from the stud-retaining aperture in opposite directions along the long axis of the base. According to another embodiment, the base also includes a pair of opposed slots extending from the stud-retaining aperture. However, each slot extends in a direction that is perpendicular to the long axis of the base.

An engine cover assembly including a fastener concealing plug is disclosed. The plug includes a conical wall having upper and lower ends. A lower circumferential ring is spaced apart from the upper ring. The lower end of the concealing plug includes a fastener-receiving recessed area. The fastener pocket of the engine cover includes upper and lower grooves having a ring area formed therebetween. The upper circumferential ring of the plug nests with the upper groove of the pocket, the recessed area of the plug nests with the ring area, and the lower circumferential ring of the plug nests with the lower groove of the pocket. The engine cover is positioned on the engine such that a cover attaching stud passes through a stud-passing aperture of the cover. A fastening nut is threaded onto the cover-attaching stud until it comes into contact with a compression-limiting spacer. The plug conceals the fastener.

A method of remanufacturing a prechamber assembly includes determining a width W of an original circumferential weld bead that extends around and joins a proximal end of an outer peripheral wall of a prechamber housing and a distal end of an outer peripheral wall of a body assembly, cutting through the weld bead in order to separate the prechamber housing from the body assembly, and removing material from an outer peripheral portion of a distal end portion of the body assembly. The method includes removing the material in an axial direction parallel to the central axis of the prechamber assembly for a distance that is from 2.5-3 times the width W.

The invention relates to a closure element (1) for tightly closing a bore (2), the closure body (3) of which closure element can be pressed into the bore (2) with an oversize. In order to avoid damage to the bore, the closure body (3) is designed as a hollow body. In this way, the closure body can deform slightly as the closure body is pressed into the bore (2) and can thereby reduce the radial pressure on the wall (4) of the borehole. At the same time, the weight of the closure element is reduced. The closure element is preferably a hollow sphere having uniform wall thickness.

A sealing device in the form of a plug that is receivable in a threaded hole of a case includes a threaded central body, a skirt connected to the central body, and locking/unlocking means that opposes spontaneous unscrewing of the plug and is automatically activated by rotation of the plug and corresponding movement along an axis. The locking/unlocking means includes a first releasable coupling component coupled for rotation with the central body, and a second releasable coupling component facing the first coupling component at least during screwing and unscrewing. In at least in a tightened condition of the plug, the second coupling component is secured against rotation relative to the case by rotation restricting means located inside the threaded bore. In the screwed condition, an annular end face of the skirt bears against a bearing face of the second releasable coupling component to transmit tightening thrust to the case.

The invention relates to a shut-off device comprising a plug intended to be placed over a threaded orifice of a casing, or to be removed therefrom, by screwing and unscrewing respectively, the plug comprising a central body bearing a screw thread, and locking and unlocking means that oppose the spontaneous unscrewing of the plug and that are activated automatically by the turning of the plug and its corresponding progression in the direction of screwing along a longitudinal axis. The locking and unlocking means comprise two releaseable coupling members, of which a first member is coupled to and turns with the central body via a protective skirt and of which a second member can be prevented from turning with respect to the casing during screwing.