Checking the wastegate valve, 4-cyl.
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Checking the wastegate valve, 4-cyl.
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Warning
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Take care if the car is warm. The coolant is hot and there is also a risk of burning yourself on the exhaust manifold.
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If it is not possible to adjust the basic charging pressure, check the wastegate valve as follows:
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1.
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Undo the hose clip on the turbocharger pressure pipe and bend the bypass pipe aside.
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2.
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Remove the exhaust manifold heat shield. The heat shield is attached with a nut and two clips on the underside.
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3.
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Undo the nuts securing the front exhaust system to the turbo unit.
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Important
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The flexible section at the front of the exhaust system should not be bent out of line by more than 7°, i.e. if the front exhaust system is allowed to hang, it must not bend more than the sag caused by its own weight.
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If the pipe is overloaded, permanent deformation of the components will result. This can cause noise and leakage, and damage at a later stage.
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Note
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Apply motor oil or the like to the nuts and carefully undo them.
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4.
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Remove the clip and unhook the pushrod from the control arm on the valve.
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5.
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Observe whether the flap valve abuts firmly against the turbine housing. Check for carbon deposits, etc.
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6.
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Check that the arm moves easily.
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7.
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Hook on the pushrod and fit the lock clip.
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8.
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Attach the front exhaust system to the turbo. Grease the studs with Molycote 1000, part No. 30 20 971.
Tightening torque: 24 Nm (18 lbf ft)
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Important
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When fitting the front exhaust system to the turbo, the nuts should be tightened alternately to avoid distorting the flange. The flange must not abut against the turbo connection flange.
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9.
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Fit the heat shield. Press on the left-hand holder first. Apply Molycote 1000, part no. 30 20 971, to the stud.
Tightening torques:
Locknut 20 Nm (15 lbf ft)
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10.
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Mount the bypass valve with pipe. Fit a new O-ring, greased with non-acidic vaseline.
Tightening torque: 8 Nm (6 lbf ft)
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