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Diaphragm unit

Diaphragm unit

To check

If the basic charge pressure cannot be altered, check as follows:


1. Disconnect the diaphragm unit vacuum hose.


2. Connect 30 14 883 Pressure/vacuum pump to the hose and create a negative pressure. Check that the control arm on the diaphragm unit moves.

3. Check that the negative pressure does not change for at least 30 seconds.

4. Remove the equipment and connect the vacuum hose.


If the control arm does not move, disconnect it from the turbocharger wastegate and check again.

If the diaphragm unit requires changing, see the method described below:

To remove


1. Remove the clip and lift the control rod off the arm. Use 83 94 538 Circlip tool.


2. Disconnect the vacuum hose from the vacuum box.

3. Remove the diaphragm unit.


To fit


1. Grease the control arm pin and fit the vacuum box to the mounting.

Tightening torque 8 Nm (6 lbf ft).


2. Connect the vacuum hose to the vacuum box.

3. Adjust the control arm and refit the clip. Refer to Basic wastegate setting, turbo .