Front exhaust pipe (B258i)
|
Front exhaust pipe (B258i)
|
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.
|
|
|
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.
|