Replacing ignition coils (S63 B44 T 2) (X6 M)

IMPORTANT: Ignition coils must not be contaminated by fuel. The resistance of the silicone hose is reduced significantly by contact with fuel, which may cause the ignition coil to fail! The silicone tube of the spark plug connector is coated with talc to reduce the pulling forces. The silicone tube must NOT be oiled or greased. This would greatly reduce the durability of the silicone hose, which can lead to a failure of the ignition coil.

Necessary preliminary tasks:

Read out the fault memory of the DME control unit.
Check stored fault messages and process procedure.
Switch off ignition.
Remove ACOUSTIC COVER .

Removal:

Release screw (1).

Release expansion tank (2) for charge air cooler and place to one side.

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Release screws (1).

Remove holder (2) for expansion tank.

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Release connector fastener (1) from ignition coil and detach connector (2).

Slowly pull the ignition coil up and out without jerking it.

NOTE: There is a possibility that the silicone tube will tear and therefore be destroyed.

This procedure is applicable to all ignition coils.

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Installation:

Installation note:

Position the ignition coil and gently push it to the limit position, if necessary by twisting it back and forth slightly. Then check anti-twist lock.

Make sure that when installing the ignition coil, the sealing lip properly seals the opening in which the ignition coil is seated.

NOTE: If the sealing lip is not properly seated on the ignition coil or if it is crushed, the ignition coil may slip out of position again in engine operation.

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Push connector (1) with connector fastener (2) open onto ignition coil.

Carefully close connector fastener (2) in direction of arrow.

The connector fastener must snap into place without great effort.

The connector must be positioned on the counter piece with hardly any gaps when the locking lever is being closed. In the process, the crank webs of the lever are positioned inside the counter piece.

NOTE: The locking lever can become deformed if it is not installed correctly. The plug connection is then no longer locked. As a result, the connector can slip out during engine operation (loose contact, misfiring).

Install holder (2) for expansion tank and fix in place using bolts (2).

Tighten down screws (1).

Tightening torque 17 10 3AZ .

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Mount expansion tank (2) for charge air cooler onto holder and fix in place with bolt (1).

Tighten screw (1).

Tightening torque 17 10 2AZ .

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Required follow-up work:

Install ACOUSTIC COVER .