Measuring Differential Plate Wear

Measuring the plate wear on the controlled-slip differential

Note: The wear dimension can be determined only by means of the measuring cylinder - Special Tool 9514.

1. Remove slave cylinder.

Note: In order to avoid venting of the lock system, the pressure line at the slave cylinder must not be disconnected when the transmission is installed. In this case, unflange the slave cylinder with pressure line from the housing.

2. Back off the adjusting screw of the measuring cylinder as far as possible (this facilitates assembly of the cylinder).





3. Mount the measuring cylinder on the transmission and tighten the knurled nut.

Note: If the transmission is installed, it is recommended to use two studs M8 x 45 with continuous thread to secure the measuring cylinder.

4. Screw in the adjusting screw on the measuring cylinder until there is no longer any axial play at the spacer tappet. Read off the wear dimension in this position.

New dimension = 34.5 mm

Wear dimension = 45.0 mm

LS = Measuring range for longitudinal lock 911 Carrera 4

QS = Measuring range for transverse lock 928 S 4, 928 GT. 928 GTS and 911 Carrera 4

1 - Spacer tappet

2 - Adjusting screw

2a - Measuring groove on adjusting screw

3 - Knurled nut

Note: When the wear dimension has been reached, the plates of the lock must be replaced. Do not correct the wear dimension at the thrust bearing under any circumstances.