11 00 050 Removing and installing engine (N55)

Special tools required:

11 0 000
11 7 310
11 8 680
13 5 281
13 5 282

Necessary preliminary work:

Disconnect NEGATIVE BATTERY LEAD .
Move engine compartment lid into service position. See 51 00... SERVICE POSITION OF ENGINE COMPARTMENT LID .
Remove CATALYTIC CONVERTER .
Remove transmission.
Remove front OUTPUT SHAFTS (AWD only).
Drain ENGINE OIL .
Remove INTAKE SILENCER HOUSING .
Remove MANIFOLD .
Remove FAN COWL with electric fan.
Remove RADIATOR .
Remove COOLANT THERMOSTAT .
Remove TRANSMISSION OIL COOLER for automatic transmission.
Detach all coolant hoses from engine.
Remove bulkhead sound insulation. See 51 71... REMOVING AND INSTALLING/REPLACING SOUND INSULATION FOR BULKHEAD UPPER PART .
Detach vacuum line from brake booster.
Unfasten engine wiring harness and lay to one side. See 12 51 100 REPLACING WIRING HARNESS SECTION FOR IGNITION AND INJECTORS (N55) , 12 51 001 REPLACING WIRING HARNESS SECTION FOR ENGINE (N55) or 12 14 550 REPLACING CONTROL UNIT (DME) (N55) .

To remove or install the engine, the towing hook 72 15 8 108 670 is required.

Fig 1: Identifying Towing Hook 72 15 8 108 670

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Support engine with special tool 11 7 310 on steering box.

Fig 2: Supporting Engine With Special Tool (11 7 310) On Steering Box

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Evacuate Air conditioning.

Release screws (1) of A/C lines and disconnect.

Do not remove air conditioning compressor.

Fig 3: Identifying Screws Of A/C Lines

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Detach right pressure pipe (1) from charge air cooler.

Fig 4: Identifying Right Pressure Pipe

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Remove circlip (1).

Unlock and disconnect fuel lines (2 and 3).

Fig 5: Identifying Fuel Lines And Circlip

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Close off fuel line (3) with special tool 13 5 281.

Close off fuel line (2) with special tool 13 5 282.

Fig 6: Identifying Fuel Line

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Disconnect plug connection (1) on carrier plate.

Disconnect plug connection (2) on carrier plate.

Disconnect plug connection (3) on carrier plate.

Release positive battery terminal (4) on carrier plate.

Tightening torque: 12 90 7AZ .

Disconnect plug connection (5) on carrier plate.

Fig 7: Identifying Plug Connection And Positive Battery Terminal On Carrier Plate

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Release screw (1) on carrier plate.

Tightening torque: 12 90 6AZ .

Lift carrier plate upward to remove.

Release power steering pump (1) and set down on front axle support.

NOTE: Do not disconnect hydraulic lines.

Shown without air conditioning compressor for purposes of clarity.

Fig 8: Identifying Power Steering Pump

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Mount special tool 11 8 680 on rear lifting eye (transmission side).

Push ball lock pin (1) in direction of arrow and hold down until special tool 11 8 680X is positioned in lifting eye.

Pull ball lock pin (1) outward in direction of arrow until both balls (2) are pushed outward.

Installation note:

For checking correct installation of special tool 11 8 680.

Fig 9: Pulling Ball Lock Pin

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There must be a 6.5 mm gap between ball lock pin (1) and ball lock pin housing.

The gap dimension can be checked using a 6.5 mm drill.

Attach special tool 11 0 000 to engine crane.

Suspend special tool 11 0 000 from the designated mounting eyelets of special tool 11 8 680 only (see arrow in illustration).

Fig 10: Attaching Special Tool 11 0 000 To Engine Crane

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Release vacuum line (1) of engine mount.

Fig 11: Identifying Vacuum Line Of Engine Mount

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Release screws (1) on engine mount on left and right.

Fig 12: Identifying Screws On Engine Mount

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Screw towing eye into cylinder head.

Tightening torque 11 12 5AZ .

Suspend special tool 11 0 000 from the designated mounting eyelets (1) only.

Lift engine out with engine crane.

Fig 13: Lifting Engine Out With Engine Crane

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Assemble engine.

Check function of DME.