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Front exhaust pipe (B258i)

Front exhaust pipe (B258i)


To remove


1. Disconnect the oxygen sensors' cables, undo the cable clamps and the clip and lift up the car.

Important

Do not twist the cables. The oxygen sensors are sensitive to blows and impacts and must be handle with care.


2. Remove the oxygen sensors, one for each cylinder bank.

3. Undo the joint between the front exhaust pipe and the catalytic converter.


4. Unscrew the front exhaust pipe from the exhaust manifolds.

Important

There are seals between the exhaust manifold and the front exhaust pipe.



To fit



1. Clean the joints.

2. Feed in the front exhaust pipe and bolt it to the exhaust manifold. Use new gaskets.

Turning torque 40 Nm (30 lbf ft).

3. Bolt together the joint under the car.

Tightening torque 20 Nm (15 lbf ft).

4. Refit the oxygen sensors. Lubricate the threads with Molycote 1000 prior to fitting.


Tightening torque 55 Nm (41 lbf ft).

Important

The oxygen sensors are sensitive to blows and impacts and must be handled with care. It is important that the connection between the oxygen sensors and the nipples is gas-tight.


5. Lower the car and reconnect the oxygen sensors' cables. Refit cable clamps and clips.