Checking the turbo pressure regulator
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Checking the turbo pressure regulator
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Warning
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Be careful if the car is warm. The coolant is hot and there is a risk of burns from the intake manifold.
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If the basic boost pressure cannot be adjusted, check the pressure regulator 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 three bolts securing the front exhaust system to the turbo.
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Important
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The flexible bellows on the front section of the exhaust system must not be bent more than 7° from its neutral position. This means that it must not be bent more than is caused by its own weight when the front exhaust system is left hanging.
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If the pipe is strained too much its components can be permanently deformed. This will result in noise, leakage and an eventual breakdown.
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4.
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Remove the retaining ring and unhook the pushrod from the valve control arm.
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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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Refit the retaining ring and hook on the pushrod.
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8.
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Fit the front exhaust system to the turbo. Lubricate the studs with Molykote 1000 (part no. 30 20 271).
Tightening torque: 25 Nm (18.4 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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Mount the heat shield. Press on the left-hand clamp first. Coat the stud with Molycote 1000 (part no. 30 20 971).
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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 (5.9 lbf ft)
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