M52 / S52 only

Unfasten engine speed sensor.

Fig 1: Unfastening Engine Speed Sensor

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Version where vibration damper and hub are two parts: Remove hub for vibration damper.

Drive out dowel pins from timing case cover towards rear.

(Mandrel diameter less than 5 mm)

Fig 2: Identifying Dowel Pins

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Unscrew timing case cover to cylinder head bolts.

Fig 3: Unscrewing Timing Case Cover

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Unfasten screws and remove timing case cover.

Fig 4: Removing Timing Case Cover

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IMPORTANT: Check cylinder head gasket for damage; if necessary, remove cylinder head and replace cylinder head gasket.

Installation:

Clean sealing surfaces.

Drive alignment pins into timing case cover until they protrude approx. 2 to 3 mm.

Fig 5: Identifying Timing Case Cover

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Installation:

Secure new seals to timing case cover with a little grease.

Fig 6: Securing New Seals To Timing Case Cover

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Installation:

Sealing faces clean and free of seal debris.

Apply Drei Bond 1209 sealing compound at following points:

A bead at the transitions to the cylinder head gasket on the left and right.
Thinly and evenly to the entire sealing face of the timing case cover to the cylinder head gasket.

Fig 7: Identifying Bead
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Installation:

Install timing case cover, insert all screws and initially tighten to approx. 5 Nm.

Fig 8: Inserting All Screws

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Installation:

Drive in dowel pins from front until flush.

Fig 9: Identifying Dowel Pins

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Installation:

Fully tighten all screws in alternate sequence.

IMPORTANT: Once all screws have been tightened down, retighten them in a second operation.

Fig 10: Tightening Screws

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Insert screws, tighten screw connection for timing case cover to cylinder head.

Fig 11: Tightening Screw Connection For Timing Case Cover

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Replace radial seal in lower timing case cover.

Assemble engine.