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.
- Lift ENGINE BONNET/HOOD INTO ASSEMBLY POSITION .
- Drain off ENGINE OIL .
- Remove AIR FILTER HOUSING .
- Remove COWL PANEL COVER PANEL .
- Remove fan cowl with electric fan. See 17 11 035 REMOVE AND INSTALL OR REPLACE THE FAN COWL WITH ELECTRIC FAN (N53, N54, N54T, N55) . Remove radiator, see 17 11 000 REMOVING AND INSTALLING RADIATOR (N53, N54, N54T) .
- 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 .
- Detach PRESSURE PIPE from both exhaust turbochargers.
- Remove INTAKE PLENUM .
- Detach vacuum line from brake servo . See 34 33 071 REPLACING VACUUM HOSE FOR BRAKE BOOSTER (N54) or 34 33 071 REPLACING VACUUM HOSE FOR BRAKE BOOSTER (N54) .
- 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 24 00 030 REMOVING AND INSTALLING AUTOMATIC TRANSMISSION (GA6HP19Z) N54/N55 ; 23 00 018 REMOVING AND INSTALLING TRANSMISSION (GS6-53BZ) N54 or 23 00 018 REMOVING AND INSTALLING TRANSMISSION (GS6-53BZ) N54 4WD .
- 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) , 22 11 011 REPLACING LEFT ENGINE MOUNT (N54) AWD , 22 11 001 REPLACING RIGHT ENGINE MOUNT (N54) or 22 11 001 REPLACING RIGHT ENGINE MOUNT (N54) AWD .
Remove left engine support arm.
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.