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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 905 (Engine Mechanical - 2.2L (LN2)) >> Repair Instructions >> Off-Vehicle Repair Instructions >> Thread Repair

Thread Repair

WARNING: This page is about a different car, the 2003 GMC Sonoma and 2003 Chevrolet S10 Pickup. However, it is still accessible from the selected car via links, so may be relevant.
  1. Use a general purpose thread repair kit. These kits are available commercially.
    CAUTION: Wear safety glasses in order to avoid eye damage.

    Important:  Refer to the kit manufacturer's instructions regarding the size of the drill and tap to use.

    Avoid any buildup of chips. Back out the tap every few turns and remove the chips.

  2. Determine the size, the pitch, and the depth of the damaged thread. If necessary, adjust the stop collars on the cutting tool and tap to the required depth.
  3. Drill out the damaged thread. Clean out any chips.
  4. Tap the hole. Lubricate the tap with light engine oil. Clean the thread.
    Fig 1: Drilling And Tapping Hole
    G01977213Courtesy of GENERAL MOTORS CORP.
  5. Thread the insert onto the mandrel of the installer. Engage the tang of the insert onto the end of the mandrel.

    Important:  The insert should be flush to one turn below the surface.

  6. Lubricate the insert with light engine oil (except when installing in aluminum) and install the insert.
  7. If the tang of the insert does not break off when backing out the installer, break the tang off with a drift.
    Fig 2: Breaking Tang Off With A Drift
    G01977214Courtesy of GENERAL MOTORS CORP.