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Home >> Chevrolet >> 2018 >> Spark LT, Automatic CVT Trans >> Repair and Diagnosis >> External Pages >> Different car >> Section 78 (Engine Mechanical - 1.4L (LV7) - Repair Instructions - Off Vehicle) >> Repair Instructions - Off Vehicle >> Thread Repair (North America) >> Cylinder Head Bolt Hole Thread Repair

Cylinder Head Bolt Hole Thread Repair

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    Fig 1: Cylinder Head Bolt Hole Thread Repair Kit
    GM313560Courtesy of GENERAL MOTORS COMPANY
    NOTE:

    The tools listed may not necessarily represent the exact tools used for the procedure.

  1. The cylinder head bolt hole thread repair kit consists of the following items:
    • Drill (1)
    • Tap (2)
    • Installer (3)
    • Sleeve (4)
    • Alignment Pin (5)
    • Bushing (6)
    • Bolts (7)
    • Fixture Plate (8)
    2. Fig 2: Fixture Plate, Bolts And Bushing
    GM525644Courtesy of GENERAL MOTORS COMPANY
    WARNING:

    Refer to Safety Glasses and Compressed Air Warning .

    NOTE:

    The use of a cutting fluid, WD 40®, or equivalent, is recommended when performing the drilling and tapping procedures. Refer to Adhesives, Fluids, Lubricants, and Sealers (North America LV7)Adhesives, Fluids, Lubricants, and Sealers (North America L5Q) .

    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
    GM525648Courtesy 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: Installing Sleeve Onto Drill
    GM313570Courtesy of GENERAL MOTORS COMPANY
  6. Install the sleeve (2) onto the drill (1), if required.
    7. Fig 5: Drilling Out Threads Of Damaged Hole
    GM525650Courtesy 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. WARNING:

    Refer to Safety Glasses and Compressed Air Warning .

  8. Using compressed air, clean out any chips.
    9. Fig 6: Tapping Threads Of Drilled Hole With Tap Wrench
    GM525653Courtesy of GENERAL MOTORS COMPANY
  9. Using a tap wrench, tap the threads of the drilled hole.
    10. Fig 7: Fixture Plate, Drill Bushing And Tool Marking
    GM377635Courtesy of GENERAL MOTORS COMPANY
  10. 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 align with the top of the drill bushing (2).

  11. Remove the fixture plate (1), bushing (2), and bolts.
    12. WARNING:

    Refer to Safety Glasses and Compressed Air Warning .

    WARNING:

    Refer to Cleaning Solvent Warning .

  12. Using compressed air, clean out any chips.
  13. Spray cleaner into the hole. Refer to Adhesives, Fluids, Lubricants, and Sealers (North America LV7)Adhesives, Fluids, Lubricants, and Sealers (North America L5Q) .
  14. Using compressed air, clean any cutting oil and chips out of the hole.
    15. Fig 8: Lubricating Installer Tool Threads
    GM313562Courtesy of GENERAL MOTORS COMPANY
    NOTE:

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

  15. Lubricate the threads of the installer tool (2) with the driver oil (1).
    16. Fig 9: Driver Tool And Insert
    GM313567Courtesy of GENERAL MOTORS COMPANY
  16. Install the insert (2) onto the driver tool (1).
    17. Fig 10: Applying Threadlock To Insert OD Threads
    GM313572Courtesy of GENERAL MOTORS COMPANY
  17. Apply threadlock LOCTITE™ 277, EN 42385 - 109  loctite (1), or equivalent to the insert OD threads (2).
    18. Fig 11: Installing Insert And Driver Into Hole
    GM525657Courtesy 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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