18 40 050 Removing and installing / replacing front exhaust manifold (N52)
Necessary preliminary tasks:
- Remove acoustic cover . See 11 00 REMOVING AND INSTALLING/REPLACING ACOUSTIC COVER (N52) .
- Remove complete exhaust system .
- Remove right engine support arm . See 22 11 100 REPLACING RIGHT ENGINE SUPPORT ARM (N52/N52K/N53) .
NOTE:
The oxygen sensors are in danger of being damaged when the exhaust manifolds are removed and installed.
Remove CONTROL SENSORS from cylinders 1 to 3.
Remove monitor sensor from cylinders 1 to 3. See 78 EMISSION CONTROL, OXYGEN SENSOR
Unscrew nuts.
Remove exhaust manifold (1).
Installation:
Clean sealing faces and replace seals.
Replace nuts.
Tightening torque 18 40 1AZ , see EXHAUST SYSTEM - TIGHTENING TORQUES .