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Home >> Buick >> 2012 >> Regal Base >> Repair and Diagnosis >> Engine Mechanical >> Engine Mechanical - 2.4L >> Repair Instructions - Off Vehicle >> Thread Repair >> Main Cap Bolt Hole Thread Repair
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Main Cap Bolt Hole Thread Repair

    Fig 1: Identifying Thread Repair Kit Components
    GM313556Courtesy of GENERAL MOTORS COMPANY
  1. The main cap bolt hole thread repair kit consists of the following items:
    • Drill (1)
    • Tap (2)
    • Installer (3)
    • Fixture Plate (4)
    • Long Bolts (5)
    • Short Bolts (6)
    • Alignment Pin (7)
    • Bushing (8)
    2. Fig 2: Identifying Alignment Dowel Pins
    GM747194Courtesy of GENERAL MOTORS COMPANY
  2. Remove the alignment dowel pins from the holes (1-4), if necessary.
    3. Fig 3: Fixture Plate, Bolt, & Bushing On Engine Block
    GM747192Courtesy of GENERAL MOTORS COMPANY
  3. Install the fixture plate, bolt, and bushing, onto the engine block.

    Position the fixture plate and bushing over the hole that is to be repaired.

  4. Position the alignment pin in the desired hole and tighten the fixture retaining bolts.
  5. Drill out the damaged hole.
    6. WARNING:

    Refer to Safety Glasses and Compressed Air Warning .

  6. Using compressed air, clean out any chips.
    7. Fig 4: View Of Fixture Plate, Drill Bushing & Tool Marking
    GM377635Courtesy of GENERAL MOTORS COMPANY
  7. Using a tap wrench, tap the threads of the drilled hole.

    In order to tap the new threads to the proper depth, rotate the tap into the hole until the mark (3) on the tap aligns with the top of the bushing (2).

    8. WARNING:

    Refer to Safety Glasses and Compressed Air Warning .

    WARNING:

    Refer to Cleaning Solvent Warning .

  8. Using compressed air, clean out any chips.
  9. Spray cleaner into the hole. Refer to Adhesives, Fluids, Lubricants, and Sealers .
  10. Using compressed air, clean any cutting oil and chips out of the hole.
    11. Fig 5: Lubricating Installer Tool Using Driver Oil
    GM313562Courtesy of GENERAL MOTORS COMPANY
    NOTE:

    Do not allow oil or other foreign material to contact the outside diameter (OD) of the insert.

  11. Lubricate the threads of the installer tool (2) with the driver oil (1).
    12. Fig 6: View of Bushing Type Insert
    GM313567Courtesy of GENERAL MOTORS COMPANY
  12. Install the insert (2) onto the driver tool (1).
    13. Fig 7: Applying Threadlock To Insert
    GM313572Courtesy of GENERAL MOTORS COMPANY
  13. Apply threadlock LOCTITE™ 277, EN 42385-109 (1), or equivalent to the insert OD threads (2).
    14. Fig 8: View Of Fixture Plate, Drill Bushing & Tool Marking
    GM377635Courtesy of GENERAL MOTORS COMPANY
    NOTE:

    The fixture plate and bushing remains installed onto the engine block during the insert installation procedure.

  14. Install the insert and driver through the bushing (2), fixture plate (1) and into the hole.

    Rotate the driver tool until the mark on the tool (3) aligns with the top of the bushing (2).

    The installer tool will tighten up before screwing completely through the insert. This is acceptable. You are forming the bottom threads of the insert and mechanically locking the insert to the base material threads.

  15. Remove the driver, bushing (2), fixture plate (1), and bolts.
    16. Fig 9: Identifying Alignment Dowel Pins
    GM747194Courtesy of GENERAL MOTORS COMPANY
  16. Install the alignment dowel pins in holes (1-4), if necessary.
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