Timing Cover: Service and Repair

Removing and Installing, Sealing or Replacing Lower Timing Case Cover

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



Remove VANOS adjustment unit. [1][2]Removing Double VANOS Adjustment Unit
Remove coolant thermostat. Service and Repair
Remove alternator drive belt and drive belt tensioner. 11 28 010 Replacing Alternator Drive Belt (M52/S52/M52TU/M54/M56)





Brace pulley for water pump with drive belt and unfasten screws.





M52 / S52 only
Unfasten engine speed sensor.
Remove vibration damper.
Version where vibration damper and hub are two parts:
Remove hub for vibration damper. Service and Repair
Remove oil sump. Service and Repair





Drive out dowel pins from timing case cover towards rear. (diameter of punch less than 5 mm)





Unscrew timing case cover to cylinder head bolts.





Unfasten screws and remove timing case cover.

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





Installation:
Clean sealing surfaces.
Drive dowel pins into timing case cover until they protrude approx. 2 to 3 mm.





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





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.





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





Installation:
Drive in dowel pins from front until flush.





Installation:
Fully tighten all screws in alternate sequence.
Tightening torque, refer to Specifications, Mechanical.

Caution: If all screws are tightened, they must be tightened again in a second operation.





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

Replace radial seal in lower timing case cover. Service and Repair
Assemble engine.