18 40 050 Removing and installing/replacing front exhaust manifold (M54)
WARNING: This page is about a different car, the 2005 BMW Z4, 2004 BMW Z4, and 2003 BMW Z4. However, it is still accessible from the selected car via links, so may be relevant.
Necessary preliminary tasks:
- Secure engine in installation position .
- Remove front splash guard.
- Remove reinforcement plate .
- Remove complete exhaust system .
- Remove bracket between exhaust manifold and transmission.
- Detach grounding cable from body.
- Remove right engine support arm with engine mount.
- Release nuts on heat shield at bottom.
- Remove right tension strut .
- Remove air pump .
- Release heat shield at top and remove.
NOTE:
The oxygen sensors are in danger of being damaged when the exhaust manifolds are removed and installed.
Remove front oxygen control sensor .
Remove cover from injection valves.
NOTE:
Do not mix up oxygen monitor sensors for cylinders 1 to 3 and 4 to 6 at plug connection to wiring harness.
Mark plug connections.
Unclip the cable from the retainer. Disconnect plug connection.
Unclip cable on rear side of engine from cable guide.
Mark plug connections.
Unclip the cable from the retainer. Disconnect plug connection.
Unclip cable on rear side of engine from cable guide.
Remove oxygen monitor sensor from cylinders 1 to 3 from above.
Unscrew nuts.
Remove exhaust manifold (1).
Installation:
Clean sealing faces, replace gaskets.
Coat threads with copper paste.
Replace nuts.
Tightening torque, see 11 62 1AZ in ENGINE - TIGHTENING TORQUES .