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DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.

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HOMESERVICE MANUALSCHEVROLET2019TAHOE LS, 4WD, GAS/ETHANOLREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 138 (ENGINE MECHANICAL - 6.0L (L96))REPAIR INSTRUCTIONS - OFF VEHICLETHREAD REPAIRMAIN CAP BOLT HOLE THREAD REPAIR

2019 Chevrolet Tahoe LS, 4WD, Gas/Ethanol

Main Cap Bolt Hole Thread Repair

2019 Chevrolet Tahoe LS, 4WD, Gas/EthanolSECTION Main Cap Bolt Hole Thread Repair

WARNING: This page is about a different car, the 2019 Chevrolet Suburban 3500 HD. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: Identifying Main Cap Bolt Hole Thread Repair Kit Components
Courtesy of GENERAL MOTORS COMPANY

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)
Courtesy of GENERAL MOTORS COMPANY

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.
Position the alignment pin in the desired hole and tighten the fixture retaining bolts.
Fig 2: Identifying Crankshaft Main Bearing Cap Bolt Tightening Sequence
Courtesy of GENERAL MOTORS COMPANY

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.
Using compressed air, clean out any chips.
Courtesy of GENERAL MOTORS COMPANY

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).
Using compressed air, clean out any chips.
Spray cleaner GM P/N 12346139 (Canadian P/N 10953463), or equivalent, into the hole.
Using compressed air, clean any cutting oil and chips out of the hole.
Courtesy of GENERAL MOTORS COMPANY

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

Lubricate the threads of the installer tool (2) with the driver oil (1).
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Install the insert (2) onto the driver tool (1).
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Apply threadlock LOCTITE™ 277, J 42385-109 (1), or equivalent, to the insert OD threads (2).
Courtesy of GENERAL MOTORS COMPANY

NOTE:
The fixture plate and bushing remains installed onto the engine block during the insert installation procedure.

Install the insert and driver (1) through the fixture plate and bushing and into the hole.

Rotate the driver tool until the mark on the tool (3) aligns with the top of the bushing (2).

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.