Tool kit for removal of broken spark plugs
AssigneeLisle Corporation
InventorMichael L. Whitehead
Life of this patent
Estimating the term…
Abstract
A kit for removal of a broken spark plug from a cylinder head includes first and second tools. The first tool is designed to position a broken porcelain element into the spark plug tip so that the second tool may be utilized to engage the tip by threading into the tip and thereafter axially withdraw the plug tip from the cylinder head by rotation of the tool.
Claims16
A spark plug removal kit for removal of a broken spark plug from a cylinder head spark plug bore, said spark plug of the type including a hollow cylindrical firing tip, a porcelain element at least partially recessed in the tip, and an externally threaded plug body, said kit comprising a first porcelain pusher tool and a second tip puller tool;
- (a) said first tool including a hollow tubular body with an axial throughbore, an externally threaded inner end including threads compatible with a threaded section of the spark plug bore, and an internally threaded segment of said throughbore;
- and
- a separate pusher element comprising an axial elongate, generally straight rod in the throughbore with an inner push tip section sized to axially engage a porcelain element to push said porcelain element axially into said hollow cylindrical tip, said rod further including a threaded section compatible with the internally threaded segment of said hollow tubular body, and a drive at an outer end of the rod opposite the inner push tip section, said rod rotatable to axially advance the inner push tip section from the throughbore of the tubular body to engage the inner push tip section with the porcelain element;
- and
- (b) said second tool including a hollow tubular member having a cylindrical outer surface with an annular land at one end, said land sized to limit the insertion of the tubular member into a spark plug socket in a cylinder head, said tubular member further including an axial throughbore, said second tool further including a separate puller rod member having an inner end with threads sized to fit into and engage the interior of a spark plug firing tip, said puller rod further including an opposite outer end with threads, said puller rod including an outer drive end and a threaded nut on the outer end for seating against the outer end of the tubular member whereby the drive end may be rotated to thread the puller rod into the firing tip and the nut may be rotated to axially withdraw the firing tip from a cylinder head.
A first tool for inserting a broken spark plug porcelain element into a hollow cylindrical firing tip in a cylinder head, said first tool comprising:
- a hollow tubular body with an axial throughbore, an externally threaded inner end, and an internally threaded segment of said throughbore;
- and
- a separate pusher element comprising an axial, elongate generally straight rod in the throughbore with an inner push tip section sized to axially engage a porcelain element to push said porcelain element into said hollow, cylindrical tip, said rod further including a threaded section compatible with the internally threaded segment of said hollow tubular body, and a drive at an outer end of the rod opposite the inner push tip section, said rod rotatable to axially advance the inner push tip section from the throughbore of the tubular body to engage the porcelain element, and a land surface at the outer end of the hollow tubular body to engage and limit axial movement of the pusher element.
A second tool for removal of a cylindrical firing tip from a cylinder head, said second tool comprising:
- a hollow tubular member having a cylindrical outer surface with an annular land at one end, said land sized to limit the insertion of the tubular member into a spark plug bore in a cylinder head, said tubular member further including an axial throughbore, said second tool further including a separate puller rod member having an inner end with threads sized to fit into the interior of a spark plug firing tip, said puller rod further including an opposite outer threaded end section, said puller rod including an outer drive end and a threaded nut on the outer threaded end section for seating against an outer end surface of the tubular member whereby the drive end may be rotated to thread the puller rod into the firing tip and the nut may be rotated to axially withdraw the firing tip from a cylinder head bore.
Dependencies are inferred from the claim text.