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Home › Jeep › 2022 › Cherokee Trailhawk › Repair and Diagnosis › Engine Mechanical › Mechanical › 3.2L Engine (Service Information) › Standard Procedure › Head Bolt Thread Repair

Head Bolt Thread Repair

NOTE:

The following procedure is performed using the TFC8313  3.6L Cylinder Head Bolt Thread Repair Kit

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GC0203147Courtesy of CHRYSLER GROUP, LLC
  1. Mark the core drill starting from the bottom cutting edge (2) up to the bottom of the drill stop collar (1) for a total drill depth of 100 mm.
    GC0203512Courtesy of CHRYSLER GROUP, LLC
  2. All open ports must be covered with tape (1) to prevent any debris from entering the engine.
    GC0203234Courtesy of CHRYSLER GROUP, LLC
  3. Remove the tape from only the holes (1) in which the drill fixture will be mounted.
    GC0203117Courtesy of CHRYSLER GROUP, LLC
  4. If necessary, remove the cylinder head alignment dowel pins from the engine block.
  5. Place the drill fixture bushing hole (1) over the hole to be repaired and loosely install the bolts.
    GC0203484Courtesy of CHRYSLER GROUP, LLC
  6. Install the drill bushing (1) into the fixture.
    GC0203303Courtesy of CHRYSLER GROUP, LLC
  7. Place the line pin (1) into the drill bushing pick-up hole using minimal down pressure on the line pin. Tighten the drill fixture mounting bolts to 12 N.m, then remove the line pin.
    GC0203652Courtesy of CHRYSLER GROUP, LLC
    NOTE:

    The use of drilling lubricant is required.

  8. Using a suitable drill motor and the supplied step drill bit with stop collar (1) properly adjusted to the correct depth, drill the hole until the stop collar touches the top of the drill bushing. Start the drill rotation after the drill is inside of the busing to prevent dulling of the cutting edges. This will require removing the drill and bushing several times to clear the metal chips.
    GC0203554Courtesy of CHRYSLER GROUP, LLC
  9. Thoroughly clean out all metal chips and debris using a long air nozzle (1) that must reach the bottom of the hole.
    NOTE:

    The use of drilling lubricant is required.

    GC0203563Courtesy of CHRYSLER GROUP, LLC
  10. Tap (1) through the drill bushing until the tap bottoms out. This will require removing the tap and bushing several times to clear metal chips. Clean all of the metal chips and debris using a brake or contact cleaner that will not leave an oily residue.
  11. Use a flashlight to inspect the hole for chips and cleanliness. The hole must be clean and dry.
    GC0203119Courtesy of CHRYSLER GROUP, LLC
  12. Lubricate the threads of the driver tool (2) with Time-Sert™ driver oil J-42385-110 or equivalent, using caution not to get oil onto the outer threads of the insert (1).
  13. Screw an insert (1) onto the driver tool, rotating 2 turns.
    GC0203637Courtesy of CHRYSLER GROUP, LLC
  14. Apply a drop of the supplied sealer (1) on the bottom threads of the insert and screw the insert into the prepared hole. When the head of the insert is seated, the driver will tighten up. Tighten the insert to 12 N.m to seat the insert, then remove the insert driver.
  15. Remove the tape and thoroughly clean any residue.
    NOTE:

    When installing the cylinder head, the proper torque sequence and torque MUST be followed in accordance with the service procedures.

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