Checking and adjusting basic charge pressure, B207
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Checking and adjusting basic charge pressure, B207
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1.
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Remove the turbo heat shield by undoing the bolts and pulling the shield straight up out of the clip on the back.
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2.
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Detach the hose from the diaphragm box.
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3.
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Remove the control arm retaining clip with 83 94 538 Circlip tool.
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4.
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Grip the pushrod with
83 94 066 Pliers
or similar tool and undo the nut.
B207R:
Use a pair of flat nose pliers and a screwdriver.
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5.
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Hold the operating arm and remove the pushrod from it. Secure the operating arm as it might otherwise "overcentre".
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6.
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Move the control arm on the wastegate to the "Closed" position and adjust the end piece so that the pushrod can easily be fitted on the control arm pin.
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7.
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Detach the pushrod from the control arm pin. Turn the end piece clockwise about 2 turns to attain a tension of 2 mm. Hook the pushrod to the control arm pin.
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9.
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Pump up the pressure carefully and read off the pressure on the pressure gauge just as the control rod starts to move (approx. 1 mm). The pressure should be 0.25 - 0.27 bar.
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10.
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If the pressure is too low, shorten the rod until the correct pressure is obtained.
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12.
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Fit the control rod and clip, grip the control rod and lock the nut.
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13.
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Remove the pressure gauge and pump.
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14.
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Refit the hose to the diaphragm box.
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15.
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Fit the turbocharger heat shield.
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16.
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Carry out charge air adaptation:
16 a. Run the car to heat up the engine.
16 b. Accelerate full throttle at 2000 rpm a few times. The time the engine speed is in the range 2000-4000 rpm must exceed 2 seconds.
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Note
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Charge air adaptation must be carried out in as high a gear as possible. If charge air adaptation is not carried out, the customer must be made aware that engine torque may fluctuate slightly the first few times during hard acceleration.
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