Differential Assembly: Testing and Inspection

Radial Play at Flange/Drive Shaft and Marking, Measuring

Special tools, testers and auxiliary items required

• Dial gauge holder (VW 387)

• Dial gauge

• Bolt M10•30

• Radial run-out must always be measured if the flange/driveshaft at rear final drive was removed. For this, make new color marking and remove old color marking.

• If a new driveshaft is installed and the color marking on the drive flange of the rear final drive is no longer visible, location of largest radial run-out (corresponding to greatest distance from turning axis) must be determined and marked with a color marking.

• This color marking - arrow A - is set opposite the color marking on the driveshaft - arrow B -.





• Radial run-out can be measured with rear final drive installed.

- Remove driveshaft from rear final drive => [ Driveshaft, Disconnecting from Rear Final Drive ] Driveshaft, Disconnecting From Rear Final Drive.

- Secure measuring tools with bolt - A - (M10x30) to rear final drive.





- Set dial indicator onto ground diameter in inside of driveshaft flange - arrow - and set to "0" with 1 mm preload.

- Rotate both rear wheels simultaneously in one direction and thereby turn flange through one complete rotation.

- Mark largest radial run-out on outer edge of flange with colored marking (equivalent to largest distance from turning axis).

- Then remove previous marking from flange.

- Install driveshaft => [ Driveshaft, securing to rear
final drive ] Driveshaft, Disconnecting From Rear Final Drive.