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HOMESERVICE MANUALSPONTIAC2008GRAND PRIX BASEREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 62 (ENGINE MECHANICAL)REPAIR INSTRUCTIONSOFF-VEHICLE REPAIR INSTRUCTIONSTHREAD REPAIRMAIN CAP BOLT HOLE THREAD REPAIR
2008 Pontiac Grand Prix Base

Main Cap Bolt Hole Thread Repair

2008 Pontiac Grand Prix BaseSECTION Main Cap Bolt Hole Thread Repair
WARNING: This page is about a different car, the 2007 Hummer H2. However, it is still accessible from the selected car via links, so may be relevant.
    Fig 1: Identifying Thread Repair Kit Components
    GM313556Courtesy of GENERAL MOTORS CORP.
  1. The main cap bolt hole thread repair kit consists of the following items:
    • The drill (1)
    • The tap (2)
    • The installer (3)
    • The fixture plate (4)
    • The long bolts (5)
    • The short bolts (6)
    • The alignment pin (7)
    • The bushing (8)
    2. Fig 2: View Of Fixture Plate, Bolt & Bushing
    GM377630Courtesy of GENERAL MOTORS CORP.
  2. 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.

  3. Position the alignment pin in the desired hole and tighten the fixture retaining bolts.
    4. Fig 3: Crankshaft Main Bearing Cap Bolt Tightening Sequence
    GM63214Courtesy of GENERAL MOTORS CORP.
  4. Drill out the damaged hole.

    The outer bolt hole locations 11-20 have the shallower counterbores. Use sleeve J 42385-316 with the drill.

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

  5. Using compressed air, clean out any chips.
    6. Fig 4: View Of Tap Upper & Lower Marks, Fixture Plate & Bushing
    GM377637Courtesy of GENERAL MOTORS CORP.
  6. 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 on the tap aligns with the top of the bushing.

    For the deeper main cap holes 1-10, rotate the tap until the upper mark (4) on the tap aligns with the top of the bushing (3).

    For the shallower main cap holes 11-20, rotate the tap until the lower mark (1) on the tap aligns with top of the bushing (3).

  7. Using compressed air, clean out any chips.
  8. Spray cleaner GM P/N 12346139 (Canadian P/N 10953463), or equivalent, into the hole.
  9. Using compressed air, clean any cutting oil and chips out of the hole.
    10. Fig 5: Lubricating Installer Tool Using Driver Oil
    GM313562Courtesy of GENERAL MOTORS CORP.
RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.