11 62 140 Removing And Installing, Sealing/Replacing Both Exhaust Manifolds (S54)

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2006 BMW M3, 2005 BMW M3, 2004 BMW M3, 2003 BMW M3, and 2002 BMW M3. However, it is still accessible from the selected car via links, so may be relevant.

E46 Only:

Remove microfilter.

Open cable duct on lower section of microfilter housing (2) and feed out cable(s).

Release screws (1) and remove lower section of microfilter housing (2).

Fig 1: Locating Lower Section Of Microfilter Housing

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Remove expansion rivets. Remove air duct (1).

Fig 2: View Of Air Duct

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Remove hose (1) for engine vent.

Remove sealing cap (2).

Remove ignition coil cover.

Fig 3: Identifying Engine Vent Hose And Sealing Cap

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NOTE: The plug housings of the oxygen sensors for cylinders 1 to 3 and 4 to 6 are different.

Unclip plug housing (1) from mounting.

Disconnect plug connections of oxygen sensors.

Fig 4: Unclipping Plug Housing From Mounting

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E46 Only:

Instructions for working on cooling system, refer to 17 00... INSTRUCTIONS FOR WORKING ON COOLING SYSTEM. .

Drain coolant.

Pull locks.

Remove hose (1).

Fig 5: Removing Coolant Hose

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Feed oxygen sensor cables out of shield plate of exhaust manifold.

NOTE: Fig. shows US version.

Fig 6: Feeding Oxygen Sensor Cables Out Of Shield Plate Of Exhaust Manifold

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Remove check valve from cylinder head.

Installation:

Replace the seal and nuts.

Remove exhaust manifold shield plate and A/C system hoses.

Remove engine splash guard.

E46 Only:

Remove reinforcement plate.

CAUTION: The article 51 71 374 REMOVING AND INSTALLING/REPLACING REINFORCEMENT PLATE ON FRONT AXLE SUPPORT (M3) contains important installation instructions.

ECE version:

Remove catalytic converter. Refer to 18 32 005 REMOVING AND INSTALLING/REPLACING CATALYTIC CONVERTER (S54) .

US version:

Remove front exhaust system (front pipes).

NOTE: The oxygen sensors are in danger of being damaged when the exhaust manifolds are removed and installed.

Remove oxygen sensors from exhaust manifolds.

NOTE: Exhaust manifolds (1 and 2) cannot be removed individually.

Detach exhaust manifold (1) from cylinder head and place on engine support arm.

Detach exhaust manifold (2) from cylinder head. Feed out exhaust manifolds (1 and 2) together.

Fig 7: View Of Exhaust Manifolds

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Installation:

Clean sealing faces, replace gaskets.

Coat threads with copper paste.

Replace nuts.

Tightening torque, refer to 11 62 1AZ in ENGINE - TIGHTENING TORQUES .

CAUTION: Ensure cables are exactly routed.

Installation:

Clip cables of oxygen sensors into mounts on shield plate of exhaust manifold.

NOTE: Fig. shows US version.

Fig 8: Locating Oxygen Sensor Cables

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