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HOMESERVICE MANUALSCHEVROLET2016CORVETTE Z06, 2D COUPE, STANDARD TRANSREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE MECHANICALMECHANICALENGINE MECHANICAL - 6.2L (LT1, LT4) - REPAIR INSTRUCTIONS - OFF VEHICLEREPAIR INSTRUCTIONS - OFF VEHICLETHREAD REPAIRMAIN CAP BOLT HOLE THREAD REPAIR
2016 Chevrolet Corvette Z06, 2D Coupe, Standard Trans

Main Cap Bolt Hole Thread Repair

2016 Chevrolet Corvette Z06, 2D Coupe, Standard TransSECTION Main Cap Bolt Hole Thread Repair
  1. The main cap bolt hole thread repair kit consists of the following items:
    Fig 1: Identifying Thread Repair Kit Components
    GM313556Courtesy of GENERAL MOTORS COMPANY
    • 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. Install the fixture plate, bolt and bushing onto the engine block.
    Fig 2: View Of Fixture Plate, Bolt & Bushing
    GM377630Courtesy of GENERAL MOTORS COMPANY

    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. Drill out the damaged hole.
    Fig 3: Crankshaft Main Bearing Cap Bolt Tightening Sequence
    GM63214Courtesy of GENERAL MOTORS COMPANY

    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. Using a tap wrench, tap the threads of the drilled hole.
    Fig 4: View Of Tap Upper & Lower Marks, Fixture Plate & Bushing
    GM377637Courtesy of GENERAL MOTORS COMPANY

    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. Lubricate the threads of the installer tool (2) with the driver oil (1).
    Fig 5: Lubricating Installer Tool Using Driver Oil
    GM313562Courtesy of GENERAL MOTORS COMPANY
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.