M52 / S52 only

Unfasten engine speed sensor.

Fig 1: Removing Engine Speed Sensor Screw

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Remove vibration damper  . See 11 23 010 Removing And Installing Or Replacing Vibration Damper (M52TU / M54 / M56) .

Version where vibration damper and hub are two parts: Remove hub for vibration damper  . See 11 23 010 Removing And Installing Or Replacing Vibration Damper (M52TU / M54 / M56) 

Remove oil sump  . See 11 13 000 Removing And Installing, Sealing Or Replacing Oil Sump (M52TU / M54 / M56) .

Drive out dowel pins from timing case cover towards rear.

(Mandrel diameter less than 5 mm)

Fig 2: Removing Dowel Pins From Timing Case Cover

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Unscrew timing case cover to cylinder head bolts.

Fig 3: Removing Timing Case Cover To Cylinder Head Bolts

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Unfasten screws and remove timing case cover.

Fig 4: Removing Timing Case Cover

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Installation: 

Clean sealing surfaces.

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

Fig 5: Aligning Pins Into 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: Applying Bead At Transitions To Cylinder Head Gasket On Left And Right

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Installation: 

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

Fig 8: Installing Timing Case Cover

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Installation: 

Drive in dowel pins from front until flush.

Fig 9: Installing Dowel Pins From Front Until Flush

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Installation: 

Fully tighten all screws in alternate sequence.

Tightening torque, see 11 14 1AZ in ENGINE - TIGHTENING TORQUES .

Fig 10: Tightening Timing Case Cover 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 To Cylinder Head

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Replace radial seal in lower timing case cover  . See 11 14 141 Replacing Radial Seal In Lower Timing Case Cover .

Assemble engine.