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Checking and adjusting basic charging pressure

Checking and adjusting basic charging pressure



1. Remove the bypass pipe with valve.


Note

There is an O-ring at the bypass pipe mounting on the compressor inlet.


2. Remove the exhaust manifold heat shield.

3. Remove the operating arm clip with special tool (part no. 83 94 538).

4. Grip the pushrod with pliers (part no. 83 94 066) or similar tool and undo the locking nut with the special tool (part no. 83 94 520) or similar tool.


5. Hold the operating arm and undo the pushrod from the operating arm. Secure the control arm, otherwise there is risk of it “jumping over”.

6. Move the operating arm on the charge pressure control valve to the “Closed” position and adjust the end piece so that the pushrod can easily be fitted on the operating arm pin.

7. Detach the pushrod from the operating arm pin. Turn the end piece clockwise about 2 turns so that a prestress of 2 mm is obtained. Attach the pushrod to the operating arm pin. Fit the circlip.

8. Detach the hose marked “W” from the diaphragm.

9. Connect the pressure/vacuum pump, part no. 30 14 883, to the diaphragm and the pressure gauge (part no. 83 93 514).


10. Carefully pump up pressure so that the control rod moves to regulate the charge pressure.

11. Read the pressure from the manometer scale when the control rod just starts to move. The pressure should be at least 0.4 bar (0.45 bar for B235R B205L/R) (but not abnormally high).

12. If the pressure is too low, shorten the rod further until the pressure is 0.4 and 0.45 bars respectively.

13. Undo the pushrod and apply a thin coat of Molykote 1000 (part no. 30 20 971) or equivalent to the pin on the operating arm.


14. Fit the pushrod and clip, grip the pushrod and lock the nut.

15. Disconnect the pressure gauge and pump.

16. Reconnect the hose to the diaphragm.

17. Fit the heat shield.


18. Lubricate the O-ring with non-acidic vaseline and fit the bypass pipe.

Tightening torque 8 Nm (5.9 lbf ft)