Thread Repair: Notes

Tools Required 

• J 42385-2000  Thread Insert Kit
• J 43965  Thread Repair Extension Kit

The thread repair process involves a solid, thin walled, self-locking, carbon steel, bushing type insert. During the insert installation process, the installation driver tool cold-rolls the bottom internal threads and expands the bottom external threads of the insert into the base material. This action mechanically locks the insert into place.

The tool kit J 42385-2000  is designed for use with either a suitable tap wrench or drill motor. Limited access and larger hole repair may process better using a tap wrench. An extension J 43965  may also be necessary to drive the thread repair tooling dependent on access to the hole being repaired.

Fig 1: Identifying Special Tools

Courtesy of GENERAL MOTORS CORP.

It is critical that the drilling, counterboring and tapping of the hole to be repaired follows the same centerline as the original hole.

Fig 2: Identifying Centerline

Courtesy of GENERAL MOTORS CORP.

During the drilling and tapping of the hole being repaired ensure the tooling is consistently machining perpendicular to the surface of the base material.

Fig 3: Identifying Direction Of Tool While Drilling And Tapping

Courtesy of GENERAL MOTORS CORP.