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.
• 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 firewall SOUND INSULATION .
• Detach vacuum line from brake booster.
• Unfasten ENGINE WIRING HARNESS and lay to one side.

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 Using 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 Circlip And Fuel Lines

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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: Closing-Off Fuel Lines Using Special Tools

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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 Connections, Positive Battery Terminal, And Screws

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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.

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: Pushing 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).

Fig 10: Attaching/Suspending Special Tool (11 0 000)

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Release vacuum line (1) of engine mount.

Fig 11: Identifying Vacuum Line

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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 Using Special Tool (11 0 000)

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Assemble engine.

Check function of DME.