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Diaphragm box

Diaphragm box

Checking


If the basic boost pressure cannot be adjusted, check as follows:


1. Disconnect the diaphragm box vacuum hose from the boost pressure control valve, BPC.

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

3. Check that the vacuum pressure does not change for 30 seconds.

4. Remove the equipment and connect the hose to the boost pressure control valve, BPC.


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

To remove



1. Remove the engine cover.

2. Remove the heat shields over the turbo charger.

3. Remove the clip and lift off the control rod from the arm.

4. Disconnect the vacuum hose from the vacuum box.

5. Remove the diaphragm box.


To fit



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

Tightening torque 8 Nm (6 lbf ft).

2. Connect the vacuum hose to the vacuum unit.

3. Adjust the control arm and refit the clip .

4. Refit the heat shield over the turbocharger.

5. Refit the engine cover.