Drive shaft flange, measuring and marking radial run-out

WARNING: This page does not describe the selected car, but rather 17 other vehicles, including the 2009 Audi S4, 2009 Audi A4, 2008 Audi S4, 2008 Audi RS 4, and 2008 Audi A4. However, it is still accessible from the selected car via links, so may be relevant.

Special tools, testers and auxiliary equipment required

Fig 1: Identifying Dial Gauge Holder VW 387

Courtesy of VOLKSWAGEN UNITED STATES, INC.

Universal dial indicator bracket VW 387
Dial indicator
Bolt M10 x 85

NOTE:

The radial run-out must always be measured when the drive shaft flange on the rear final drive has been removed. Affix a new colored dot and remove the old color marking.
If a new drive shaft is installed and if the marking on the flange shaft of the rear final drive is no longer visible, the position of maximum radial run-out must be determined and marked by a colored dot.
The colored dot on the drive shaft is positioned opposite the above colored dot. Refer to Installing .
The radial run-out can be measured when rear final drive is installed but the drive shaft must be disconnected at rear final drive. See notes. Refer to Drive shaft, servicing

Fig 2: Install Measuring Tools (Vehicles With Threaded Hole In Facing Side Of Rear Final Drive)

Courtesy of VOLKSWAGEN UNITED STATES, INC.

Secure universal dial indicator holder VW 387 with dial indicator at rear final drive.
Position dial indicator on ground diameter in drive shaft flange -arrow- and set to "0" with 1 mm preload.
Rotate differential by turning the two rear wheels (left and right-hand flange shafts) simultaneously in one direction until the drive shaft flange has undergone one complete revolution.
Mark the position of greatest radial run-out on flange exterior by a colored dot (equates to greatest distance from rotational axis).

Remove old marking from drive shaft flange.
Install drive shaft. Refer to Drive shaft, removing and installing .