Rear exhaust manifold (B258i)
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Rear exhaust manifold (B258i)
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1.
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Disconnect the battery's negative cable, unplug the oxygen sensors' leads, undo the cable clamps and clips and raise the car.
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2.
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Unscrew the nuts securing the front exhaust pipe to the exhaust manifolds and lower away the pipe.
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Important
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Gaskets are fitted between the exhaust manifolds and front exhaust pipe.
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3.
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Lower the car to the floor and undo the upper nuts retaining the exhaust manifold.
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4.
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Raise the car and undo the lower nuts. Remove the exhaust manifold with gaskets.
Warning
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The heat shield may have sharp edges.
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1.
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Clean the surfaces and fit the exhaust manifold with new gaskets.
Tightening torque 20 Nm (15 lbf ft).
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2.
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Position the front exhaust pipe and screw it to the exhaust manifold. Fit new gaskets.
Tightening torque 40 Nm (30 lbf ft).
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3.
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Bolt together the joints under the car.
Tightening torque 20 Nm (15 lbf ft).
Lower the car to the floor.
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4.
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Plug in the oxygen sensors' leads and fit the cable clamps and clips.
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Warning
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The heat shield may have sharp edges.
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