11 41 010 Removing and installing/replacing chain module for oil pump/vacuum pump (N55) - from 03.2012

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Special tools required:

IMPORTANT: Aluminum screws/bolts must be replaced each time they are released .
Aluminum screws/bolts are permitted with and without color coding (blue).
For reliable identification:
Aluminum screws/bolts are not magnetic .
Jointing torque and angle of rotation must be observed without fail (risk of damage) .

Necessary preliminary tasks:

REMOVE CYLINDER HEAD COVER .
Remove all SPARK PLUGS .
Removing oil sump . See REMOVING AND INSTALLING, SEALING OR REPLACING OIL SUMP (N55, RWD) or REMOVING AND INSTALLING, SEALING OR REPLACING OIL SUMP (N55, AWD) .
Remove DRIVE BELT .
Remove TENSIONING DEVICE for drive belt.
Remove VIBRATION DAMPER .
Remove SEALING COVER for vacuum pump.
SEALING CAP for oil pump chain tensioner.
Remove CHAIN TENSIONER .
Remove TIMING CHAIN .

Screw in special tool 11 8 650 on screw connection of belt tensioner on crankcase.

Turn sprocket with central bolt at crankshaft into position until special tool 11 0 290 can be secured.

Simultaneously secure special tool 11 0 290 to sprocket and special tool 11 8 650 .

Release screw (1) for sprocket.

Tightening torque 11 66 2AZ .

Fig 1: Releasing Screw For Sprocket

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IMPORTANT: Before releasing the central bolt on the oil pump, the hydraulic chain tensioner must be drained.

Carefully press tensioning rail (1) with a suitable screwdriver (2) in direction of arrow.

As the oil pressure in the chain tensioner can only be drained pulsating, the tensioning rail (1) must be pressed several times.

Fig 2: Pressing Tensioning Rail Using Screwdriver

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Press the tensioning rail (1) and hold down.

Fix chain tensioner piston in position with a suitable lock pin (2).

Release screws (3).

Tightening torque: 11 41 7AZ .

Fig 3: Securing Chain Tensioner Using Lock Pin

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NOTE: Sprocket must be blocked in order to release central bolt (1).

Secure special tool 2 303 793 to crankcase.

Release oil pump central bolt (1).

Tightening torque 11 41 5AZ .

Fig 4: Securing Special Tool 2 303 793 Onto Crankcase

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Remove fastener (1) in direction of arrow.

Fig 5: Removing Fastener

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Position flywheel (1) with special tool 11 0 300 in TDC setting.

Fig 6: Positioning Flywheel With Special Tool 11 0 300

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Release aluminum screws (1).

Remove oil pump drive gear from the drive shaft.

Fig 7: Locating Chain Module Aluminum Screws

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Open screw plug (1).

Tightening torque: 11 11 9AZ .

Installation note:

Replace sealing ring.

Fig 8: Identifying Screw Plug

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Lock flywheel (1) with special tool 11 9 260 .

Fig 9: Locking Flywheel Using Special Tool 11 9 260

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IMPORTANT: Do not remove special tools 11 0 300 and 11 4 280 to release central bolt (1).

Release central bolt (1).

Installation note:

Release central bolt (1) with 3/4 tool (2).

Breakaway torque approx. 500 Nm.

Fig 10: Removing Central Bolt

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Screw in two screws (1) and remove hub (2) in direction of arrow.

Installation note:

Replace CRANKSHAFT SEAL at front.

Fig 11: Moving Hub On Crankshaft

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Release aluminum screw (1) with special tool 11 8 640 .

Fig 12: Identifying Aluminum Screw

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Remove chain module (1) in direction of arrow.

Fig 13: Removing Chain Module

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IMPORTANT: Note installation direction of sprocket (2).
Collar (see arrow in illustration) on sprocket (2) points to engine .
Incorrect assembly will result in engine damage .

Fig 14: Locating Collar On Camshaft Sprocket