Front Subframe: Service and Repair

Subframe Mounting Threads, Repairing


Observe safety precautions.

If welding or cutting with spark-producing devices/tools or when plating in foamed areas where hazardous gases are produced that are harmful to humans and the environment, these procedures are to be omitted in each case.

• Subframe (suspension subframe) was already removed.

• In the example, thread repair on this vehicle is described for left front mount for subframe and is to be employed at the other mounts accordingly as necessary.

Special tools, testers and auxiliary items required

• Thread repair set M 12x1.5 (VAS 6058)

• Drill (VAS 6267)

• Single hand angle grinder (VAS 5167)






1 Threaded plate (welded inside the subframe)

• The threaded plate is not a replacement part and can be serviced only one time if damaged.

2 Helicoil thread insert

Contents of Thread Repair Set






1 Spiral drill 12.5 mm diameter

2 Tap M 12 x 1.5

3 Installing spindle

4 Thread insert M 12 x 1.5 x 24 ( (VAS 6058/1) )

5 Peg breaker with magnetic tips

Threads, Repairing

Threads, Drilling

- Drill out the threads with the spiral drill.






• For drilling and grinding, use drill (VAS 6267).

• While drilling, drill must be held by a second person using an additional handle.

• Do not angle the drill.






Threads, Cutting


Wear protective eyewear when cutting the thread and when cleaning the threaded bushing with compressed air.

- Cut the threads with the thread tap.






Thread Inserts, Inserting

- Turn the threaded insert - 3 - onto the spindle until the drive peg - 2 - makes contact on drive tab - 1 - of installing spindle.






- Clean threaded bushing (blow with pressurized air).

• Thread insert must be able to be turned easily.

- Screw the threaded insert into the threaded plate until the threaded insert is seated flush with the outer edge of the threaded plate (check visually).






- Then tighten the threaded insert by a 1/4 turn further.

- Remove the spindle.

- Break off thread insert driver tang using tang breaker.






- Install the subframe (suspension subframe) (tightening specification). Refer to.