Shielding device for oriented spark plugs

A separate and removable spark plug shield for surrounding a spark plug adapted to have the electrodes thereof fitted in a bore of an engine block, said shield comprising an elongated hollow body with a central opening sized to receive a spark plug, said body having an end fitted into a counterbore in an engine surrounding said bore and having a portion of said end below the surface of the engine block, means for securing said end of said body to said engine block within said counterbore so that substantially the entire portion of said spark plug is enclosed by said shield, shoulder means on said body located in said central opening and in proximity to said end to engage a shoulder portion on a spark plug and clamp same to aid engine block, and means at the other end of said body for operatively connecting an ignition wire to a spark plug.

A shielded, oriented spark plug assembly comprising an engine part having a spark lug bore, a spark plug having a body disposed in said bore, means for positively orienting said body in said bore, said body having a shoulder facing outwardly of said bore, a separate and removable shield disposed around said spark plug, said shield having a central opening to receive the body of the spark plug and having a shoulder in said opening engaged with the shoulder on said body for axially forcing the body of the spark plug in said bore, and means clamping said shield on said engine part with said shoulders holding said body in said bore.

A separate and removable plug shield for use with a spark plug having a casing and orientable electrodes for extension through a bore in an engine block and with means for positively orienting said casing in said bore, said shield comprising an elongated hollow body with a central opening sized to receive the casing of a spark plug, said elongated body having an internal shoulder in said central opening facing an end of the elongated body for engagement with the end of said elongated body fitted into a counterbore of said engine surrounding said bore and having a piston below the surface of said engine block, said elongated body having threaded means cooperative with and securable to an engine for axially forcing said casing of said plug toward said engine and clamping the casing of said plug between said shoulder and the engine, and means at the other end of said body for connecting a shielded ignition wire to said body in contact with the plug.