This patent discloses a method for repairing cylinder head bolt holes including removing the cylinder head from the damaged cylinder bore and removing an adjacent cylinder head from its adjacent cylinder bore. A drill base support is installed in the adjacent cylinder bore and drilling platform studs are installed at locations corresponding to the drill base studs are installed at locations corresponding to the drill base stud holes. A drill base and a jig are installed and a drill press is used to drill and remove broken bolts. The inside diameter of the damaged bolt hole is measured and studs are installed in the block with adhesive applied to the threads of the studs.

  • Supplemental Notes:
    • Filed 19 Jul 90 patented 25 Jun 91; Supersedes PAT-APPL-7-554 756.; This Government-owned invention available for U.S. licensing and, possibly, for foreign licensing. Copy of patent available Commissioner of Patents, Washington, DC 20231 $1.50.; Patent
  • Corporate Authors:

    Department of the Navy

    Washington, DC  United States 
  • Authors:
    • Stafford, J C
  • Publication Date: 0


  • English

Media Info

  • Pagination: 12 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00666724
  • Record Type: Publication
  • Source Agency: National Technical Information Service
  • Report/Paper Numbers: PAT-APPL-7-554 756; PATENT-5 025 556
  • Files: TRIS
  • Created Date: Oct 3 1994 12:00AM