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Home › Chevrolet › 2016 › SS Automatic Trans › Repair and Diagnosis › Engine Mechanical › Engine Mechanical - 6.2L (LS3) › Repair Instructions - Off Vehicle › Thread Repair › Cylinder Head Bolt Hole Thread Repair

Cylinder Head Bolt Hole Thread Repair

    Fig 1: Thread Repair Kit Components
    GM313560Courtesy of GENERAL MOTORS COMPANY
  1. The cylinder head bolt hole thread repair kit consists of the following items:
    • The drill (1)
    • The tap (2)
    • The installer (3)
    • The sleeve (4)
    • The alignment pin (5)
    • The bushing (6)
    • The bolts (7)
    • The fixture plate (8)
    2. Fig 2: Fixture Plate, Bolts, Bushing & Cylinder Hole
    GM313574Courtesy of GENERAL MOTORS COMPANY
    WARNING:

    Refer to Safety Glasses Warning .

    NOTE:
    • The use of a cutting type fluid, WD 40®, or equivalent, is recommended when performing the drilling and tapping procedures. Refer to Adhesives, Fluids, Lubricants, and Sealers  for recommended fluid.
    • Driver oil MUST be used on the installer driver tool.
    • The tool kits are designed for use with either a suitable tap wrench or drill motor.
  2. Install the fixture plate (3), bolts (1), and bushing (2) onto the engine block deck.

    Position the fixture plate and bushing over the hole that is to be repaired (4).

    3. Fig 3: Alignment Pin & Fixture Retaining Bolts
    GM313577Courtesy of GENERAL MOTORS COMPANY
  3. Position the alignment pin (1) through the bushing and into the hole.
  4. With the alignment pin in the desired hole, tighten the fixture retaining bolts (2).
  5. Remove the alignment pin from the hole.
    6. Fig 4: Stop Collar & Counterbore Drill
    GM313570Courtesy of GENERAL MOTORS COMPANY
  6. Install the sleeve (2) onto the drill (1).
    7. Fig 5: Drilling Cylinder Head Bolt Hole
    GM309861Courtesy of GENERAL MOTORS COMPANY
    NOTE:

    During the reaming process, it is necessary to repeatedly remove the drill and clean the chips from the hole.

  7. Drill out the threads of the damaged hole.

    Drill the hole until the stop collar of the drill bit or the sleeve contacts the bushing.

  8. Using compressed air, clean out any chips.
    9. Fig 6: Tapping Threads Of Drilled Hole Using Tapping Wrench
    GM320667Courtesy of GENERAL MOTORS COMPANY
  9. Using a tap wrench, tap the threads of the drilled hole.
    10. Fig 7: Tap Upper & Lower Marks, Fixture Plate & Bushing
    GM377637Courtesy of GENERAL MOTORS COMPANY
  10. In order to tap the new threads to the proper depth, rotate the tap into the hole until the mark (1) on the tap aligns with the top of the drill bushing (3).
  11. Remove the fixture plate (2), bushing (3), and bolts.
  12. Using compressed air, clean out any chips.
  13. Spray cleaner into the hole. Refer to Adhesives, Fluids, Lubricants, and Sealers  for recommended cleaner.
  14. Using compressed air, clean any cutting oil and chips out of the hole.
    15. Fig 8: Lubricating Installer Tool Using Driver Oil
    GM313562Courtesy of GENERAL MOTORS COMPANY
    NOTE:

    Do not allow oil or foreign material to contact the OD of the insert.

  15. Lubricate the threads of the installer tool (2) with the driver oil (1).
    16. Fig 9: Bushing Type Insert
    GM313567Courtesy of GENERAL MOTORS COMPANY
  16. Install the insert (2) onto the driver tool (1).
    17. Fig 10: Applying Threadlock To Insert
    GM313572Courtesy of GENERAL MOTORS COMPANY
  17. Apply threadlock LOCTITE™ 277, J 42385-109 (1), or equivalent, to the insert OD threads (2).
    18. Fig 11: Installing Insert & Driver Into Cylinder Bolt Hole
    GM320669Courtesy of GENERAL MOTORS COMPANY
  18. Install the insert and driver (1) into the hole.

    Rotate the driver tool until the mark on the tool aligns with the deck surface of the engine block.

    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.

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