Tapered Pipe Thread Repair

The thread repair insert for tapered pipe threads is coated with a clear silver zinc coating.

Courtesy of GENERAL MOTORS COMPANY

When installed to the proper depth, the flange (1) of the insert will be seated against surface (2) of the base material of the drilled/tapped hole.

1. Courtesy of GENERAL MOTORS COMPANY

   NOTE:

   • During the drilling process, it is necessary to repeatedly remove the drill and clean chips from the hole and the flutes of the drill.
   • Drill the hole until the stop collar contacts the surface of the base material.

   Drill out the threads of the damaged hole.

2. Courtesy of GENERAL MOTORS COMPANY

   NOTE:

   All chips must be removed from the drilled hole prior to tapping.

   Using compressed air, clean out any chips.

3. Courtesy of GENERAL MOTORS COMPANY

   NOTE:

   • During the tapping process, it is necessary to repeatedly remove the tap and clean chips from the hole and the flutes of the tap.
   • Ensure the tap has created full threads at least to the depth equal to the insert length.

   Using a suitable tapping wrench, tap the threads of the drilled hole by hand only.

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   Tap the drilled hole until the threads at the top of the tap (2) are down to the surface of the base material.

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   NOTE:

   All chips must be removed from the tapped hole prior to insert installation.

   Using compressed air, clean out any chips.

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   Spray cleaner into the tapped hole. Refer to Adhesives, Fluids, Lubricants, and Sealers for recommended cleaner.

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   NOTE:

   All chips must be removed from the tapped hole prior to insert installation.

   Using compressed air, clean out any chips.

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   NOTE:

   Do not allow oil or other foreign material to contact the outside diameter (OD) of the insert.

   Lubricate the threads of the driver installation tool (2) with the EN 42385-110 (1).

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   Install the insert (2) onto the driver installation tool (1).

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    Apply threadlock sealant, EN - 42385-109  , LOCTITE 277® or equivalent (1) to the insert OD threads (2). Refer to Adhesives, Fluids, Lubricants, and Sealers for recommended sealant.

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    Install the insert (2) into the tapped hole by hand only.

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    NOTE:

    If the insert will not thread down until the flange contacts the surface of the base material remove the insert immediately with a screw extracting tool and inspect the tapped hole for any remaining chips and/or improper tapping.

    Install the insert until the flange of the insert (3) contacts the surface of the base material.

NOTE:

The driver installation tool will tighten up before screwing completely through the insert. This is acceptable. The threads at the bottom of the insert are being formed and the insert is mechanically locking the insert into the base material threads.

13. Continue to rotate the driver installation tool (1) until the top of the threaded section (2) is level with the top of the insert (3).

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    Inspect the insert (1) for proper installation (2) into the tapped hole.

15. Courtesy of GENERAL MOTORS COMPANY

    Any installed insert that restricts or blocks an oil or engine coolant passage (3) will need to have the oil or engine coolant passage drilled out (4) to the original size of the oil or engine coolant passage. After drilling the restriction or blockage, clean out any chips and thread the installation driver tool through the insert again to remove any burrs caused by the drilling of the oil or engine coolant passage.