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Checking and adjusting basic charging pressure (B235R)

Checking and adjusting basic charging pressure (B235R)


1. Remove the bypass pipe with valve.


Note

There is an O-ring where the bypass pipe is fastened to the turbocharger inlet pipe.


2. Remove the exhaust manifold heat shield. The heat shield is fastened with a nut and two clips underneath.

3. Remove the locking clip on the operating arm with circlip pliers, part no. 83 94 538.

4. Grip the pushrod with pliers, part no. 83 94 066 or similar tool. Undo the lock nut with spanner, part no. 83 94 520 or equivalent.


5. Hold the operating arm and detach the pushrod. Secure the arm. Otherwise, the operating arm may ”jump over”.

6. Move the operating arm on the boost pressure control valve towards ”Closed” and adjust the end piece so that the pushrod fits easily on the operating arm pin.

7. Detach the pushrod from the control arm pin. Turn the end piece clockwise approx. 2 turns so that a 2 mm tension is achieved. Hook on the pushrod to the operating arm pin. Fit the locking ring.

8. Detach the hose from the diaphragm box.

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


10. Carefully pump up pressure until the control rod moves to regulate the boost pressure.

11. Just as the control rod starts to move, read off the pressure on the pressure gauge. It should be 0.45 bar (±0.03 bar).

12. Shorten the rod if the pressure is too low until 0.45 bar is obtained.

13. Undo the pushrod and apply 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 with a pair of adjustable pliers and lock the nut.

15. Remove the pressure gauge and pump.

16. Reconnect the hose to the diaphragm box.

17. Fit the heat shield.


18. Lubricate the O-ring with acid-free petroleum jelly and fit the bypass pipe.

Tightening torque: 8 Nm (5.9 lbf ft)