11 00 050 Removing and installing engine (N54, N54T)
Special tools required:
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:
- Disconnect battery negative lead. See 61 20 900 DISCONNECTING AND CONNECTING BATTERY NEGATIVE LEAD .
- Lift ENGINE BONNET/HOOD INTO ASSEMBLY POSITION
- Drain off ENGINE OIL
- Remove AIR FILTER HOUSING
- Remove cowl panel cover panel. See 51 13 115 REMOVING AND INSTALLING/REPLACING COWL PANEL COVER .
- Remove FAN COWL with electric fan.
- Remove RADIATOR .
- Remove EXPANSION TANK .
- Detach all coolant hoses from engine
- Release OIL PIPES from oil-to-water heat exchanger
- Remove ALTERNATOR DRIVE BELT
- Remove air conditioning compressor. See 64 52 521 REPLACING A/C COMPRESSOR (N54, N55) .
- Detach PRESSURE PIPE from both exhaust turbochargers
- Remove INTAKE PLENUM
- Detach vacuum line from brake servo
- Unfasten IGNITION WIRING HARNESS and lay to one side
- Release ENGINE WIRING HARNESS from electronics box and lay to one side
- Remove exhaust system . See 18 32 050 REMOVING AND INSTALLING/REPLACE CATALYTIC CONVERTER FOR CYLINDERS 1-3 (N54, N54T) or 18 32 060 REMOVING AND INSTALLING/REPLACE CATALYTIC CONVERTER FOR CYLINDERS 4-6 (N54, N54T) .
- Remove catalytic exhaust-gas converters . See 18 32 050 REMOVING AND INSTALLING/REPLACE CATALYTIC CONVERTER FOR CYLINDERS 1-3 (N54, N54T) or 18 32 060 REMOVING AND INSTALLING/REPLACE CATALYTIC CONVERTER FOR CYLINDERS 4-6 (N54, N54T)
- Remove output shafts (all-wheel drive vehicles only)
- Remove POWER STEERING PUMP
- Remove reinforcement plate (all-wheel drive vehicles only)
- Remove transmission. See 23 00 028 REMOVING AND INSTALLING TRANSMISSION (GS6-45BZ) N54T, N55 .
- Release grounding strap on left engine support arm
Release screws (1, 2).
Remove heater end panel (3).
Installation note:
Make sure heater end panel is correctly seated.
M6x20 bolt must be fitted in middle.
Support engine with special tool 11 7 310 on steering box.
Release screws (1) for A/C lines.
Disconnect fuel lines (1).
Seal fuel lines with special tool 13 5 281 and
13 5 282 .
Detach vacuum line from engine mount.
Secure special tool 11 8 680 to lifting eye on gearbox side.
Press locking pin (1) in direction of arrow until locking balls (2) are loose.
Secure special tool 11 8 680 to lifting eye. Release locking pin (1).
Installation note:
Special tool 11 8 680 is mounted correctly if the locking balls (2) are locked.
Special tool 11 8 680 is firmly secured to lifting eye.
Attach special tool 11 0 000 to special tool 11 8 680 in eye (1).
Screw in towing hook (1).
Attach special tool 11 0 000 to engine crane.
Suspend special tool 11 0 000 from the designated mounting eyelets (2) only.
Unscrew left and right engine mounts. See 22 11 011 REPLACING LEFT ENGINE MOUNT (N54) or 22 11 001 REPLACING RIGHT ENGINE MOUNT (N54) .
Remove left engine support arm. See 22 11 110 REPLACING LEFT ENGINE SUPPORT ARM (N54) .
Lift engine out with crane.
Installation note:
Fix special tool 11 7 310 onto steering box.
Assemble engine.
Observe following in case of EXCHANGE ENGINE .
Check function of DME.