Repairing Chassis Subframe Mount Thread On Rear Side Member

Information 

The cut-out diagrams of the thread repairs are examples and are designed to show the installation dimensions of the threaded insert. They do not always show the exact component on which the threaded insert is installed.

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Overview of standard thread on rear side member

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Threaded bushing in chassis mounting

1. Drill out thread.
   1. 1.1 Fully drill out old threading using drill bit from set -B-  .

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   Drill

   Information 

   • The M14 repair bush for the rear axle must be installed recessed. To mill in the respective shoulder, the tool with the designation  > VAS 6945 - Combination flat countersink set, M12 and M14 must be used. The supplied tool from the complete set must not be used in this case! 
2. Mill shoulder.

   Use an electronically controlled power drill set to a speed of approx. 250 1/Min for milling in.

   1. 2.1 M14, rear axle:
      1. 2.1.1 Mill out drill hole with spot facer -C-  to dimension -X-  .

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      Spot facer

      Milling in may only be performed using the tool > VAS 6945 - Combination flat countersink set, M12 and M14  > Test and adjustment value 4 mm 

3. Cut thread.
   1. 3.1 M14, rear axle:
      1. 3.1.1 Cut thread to dimension -Y-  in the chassis bush using the cutting tool. > Test and adjustment value 35 mm 

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         Thread cutting tool

      2. 3.1.2 Clean the threading on the chassis bush.
4. Position threaded bushing on screw-in tool.
   1. 4.1 Clean threads on bushing and on screw-in tool.
   2. 4.2 Oil the screw-in tool -E-  .
   3. 4.3 Screw threaded bushing -A-  onto the screw-in tool -E-  by hand.

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   Threaded bushing on screw-in tool

5. Screw in threaded bushing.
   1. 5.1 Screw in threaded bushing -A-  fully using the screw-in tool -E-  .

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   Screw-in tool

   Information 

   • While pressing in the base thread, a noticeably larger amount of force on the screw-in tool is required to form the internal thread. Pressing is finished when the screw-in tool can be turned further more easily. 
6. Pressed threaded bushing.
   1. 6.1 Form and press the threaded bushing -A-  by turning further with the screw-in tool -E-  in the base thread.

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      Pressed threaded bushing

7. Unscrew and remove screw-in tool -E-  from the threaded bushing -A-  .

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   Screw-in tool