Subframe: Service and Repair

WM 518941 Repairing threaded bush for suspension subframe mount

Tools





Technical values






Tools and materials





Information

- To mill the required shoulder, the tool with the designation Spot facer for Time-Sert thread repair set NR.122-2 must be used. The tool provided with the complete set supplied must not be used in this case.






Installing repair threaded bush

NOTICE

Risk of material damage due to incorrectly screwed joints on chassis parts following thread repair.

- Threaded joints may not be secured correctly following repairs due to modified chassis mounting points on the rear axle on MY 08 vehicles.

-> The rear axle must always be secured using the => HEXAGON-HEAD BOLT N.909.763.02 following repairs to the chassis bush.
-> Always replace fastening screws for the chassis bush following repairs.









Information

- The repair bush must be installed recessed. To mill the required shoulder, the tool with the designation Spot facer for Time-Sert thread repair set NR.122-2 must be used. The tool provided with the complete set supplied must not be used in this case.

1. Drill out thread.
1.1. Drill out the old thread with a drill to the root of the thread.
2. Mill shoulder.
2.1. Mill out drill hole with spot facer -C- to dimension -X-. => Test and adjustment value: 10 mm Milling must only be performed using tool Spot facer for Time-Sert thread repair set NR.122-2 .
For milling, use an electronically controlled power drill set at a speed of approx. 250 1 /min.





3. Cut thread.
3.1. Cut thread using a cutting tool -D- up to dimension -Y- in the chassis bushing. => Test and adjustment value: 40 mm Clean thread on chassis bushing (blow out swarf).





4. Position threaded bush on screw-in tool.
4.1. Clean thread on bush and on screw-in tool.
4.2. Oil the screw-in tool -E-.





4.3. Screw the threaded bush -A- onto the screw-in tool -E- by hand.





5. Screw in threaded bush.
5.1. Fully screw in the threaded bush using the screw-in tool -E-.





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. Press threaded bush.
6.1. Form and press the threaded bush by turning further with the screw-in tool -E- in the base thread.





7. Unscrew the screw-in tool -E- from the threaded bush.