Porsche 996 TT, Repair Manual

Page: 1959 / 2099

8. Read off the installation dimension E from the crown wheel.
1 Installation dimension E
2 Backlash F
3 Matching number
Example: E = 70.20 mm
9. Set the installation dimension E on special tool universal master gauge VW 385/30 and set the dial
gauge to 0 with 2 mm pretension.
10. Place special tool adjusting shim 9281 on the pinion head of the output shaft.
11. Insert the measuring mandrel as shown in the illustration.
12. Place the side transmission cover in position without an O−ring and pull downwards with 4 screws. Do
not knock.
Tightening torque: 25 Nm (19 ftlb.)
13. Press tapered roller bearing with the centring screw over the spindle into the bearing shells. It should just
be possible to turn the measuring mandrel by hand.
14. Turn the measuring mandrel carefully back and forth until the reversing point on the dial gauge is
reached. At this point, the dial gauge extension is positioned exactly at right angles to the front face of the
pinion head.
15. Read off the deviation from the specified adjusting value E. If the deviation is greater than 0.04 mm, a
correction must be carried out.
Example: 0.10 mm
Note
So in the example, the actual value of the adjusting dimension E would not be 70.20 but rather 70.30
mm. •
16. In order to achieve the required adjusting dimension E, the adjusting shim S3 must be adjusted by the
measured value.
Example: new disc thickness S3 = 0.90 mm
17.
einordnung
Determining disc thickness S3 1896