24 00 033 Removing and installing automatic transmission (GA8HP45Z) (N55 engine)

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Special tools required:

IMPORTANT:

To prevent heavy damage to the engine block, the protruding thread of the transmission bolts absolutely must be checked for damage and corrosion before removal .

If there are signs of corrosion, the rust must be removed and the threads must be cleaned before removal .

Replace rusted, damaged screws.

Failure to comply with this instruction will result in serious damage to the engine block and transmission.

IMPORTANT:

Do not let skin come in contact with transmission oil and do not inhale transmission oil vapors.
Wear protective gloves.
Ensure adequate ventilation

IMPORTANT:

After completing work, check TRANSMISSION OIL LEVEL .

Use only the approved TRANSMISSION OIL .

Failure to comply with this requirement will result in serious damage to the automatic transmission!

IMPORTANT:

For vehicles with N54/N55 engine up to production date 09/2012, aluminum bolts for the for the securing of the transmission are also installed.

As of production date 09/2012, only steel bolts are installed for the securing of the transmission.

NOTE:

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) .

The aluminum bolts can be optionally replaced by steel bolts.

Necessary preliminary tasks:

Disconnect the BATTERY
Remove underbody protection at front and rear. See REMOVING FRONT UNDERBODY PROTECTION and REMOVING REAR UNDERBODY PROTECTION .
Remove REINFORCEMENT PLATE
Important installation notes are included in that procedural information
Remove both hose connectors on the charge air cooler on the left and right.
Remove EXHAUST SYSTEM
Remove heat shields
Release MONITORING SENSOR on catalytic converter
Remove PROPELLER SHAFT
Disconnect PROPELLER SHAFT at transfer box, release center mount
Tie back propeller shaft to vehicle underbody

NOTE:

Bending the propeller shaft by an excessive angle can cause premature damage to the joint/propeller shaft!

Support engine with jack when removing gearbox

Remove upper part of cable duct (1).

Fig 1: Identifying Cable Duct Upper Part

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Release cable (1) from holder (2).

Release screw (3).

Remove cover (4).

Tightening torque 24 00 1AZ .

Fig 2: Identifying Cable, Holder And Cover

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Check installed bracket position (1).

Fig 3: Identifying Bracket Position

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Release screws (1).

Steel screws, tightening torque 24 00 1AZ .

Aluminium screws, tightening torque 24 00 2AZ .

Slacken nut (2).

Tightening torque 18 20 1AZ .

Remove bracket (3).

Fig 4: Identifying Screws, Slacken Nut And Bracket

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Release screw (1).

Disconnect hydraulic lines (2) to transmission oil cooler.

Tightening torque 17 22 1AZ .

Installation note:

Replace sealing rings.

IMPORTANT:

Observe the installation sequence.

Failure to observe this sequence will result in leaks:

Lower hydraulic line.
Upper hydraulic line.

Fig 5: Identifying Screw And Hydraulic Lines

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Crank engine at vibration damper in direction of rotation until screw (1) is visible in recess.

Release all 6 bolts of torque converter with special tool 24 1 110 .

Installation note:

Replace converter screws. Remove any remaining adhesive residue from the thread.

Tightening torque 24 40 1AZ .

Fig 6: Identifying Screw

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Prepare special tool (1) 24 4 161 with shaped element (2) 24 4 166 as pictured (note position of "A" in illustration).

Fig 7: Identifying Special Tool 24 4 161

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Insert special tool 24 4 160 into recess of transmission housing and clamp gently with screw (1).

Raise by turning screw (2) and clamp down.

Then tighten down screw (1).

Fig 8: Inserting Special Tool (24 4 160) Into Transmission Housing

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Supporting transmission:

Support transmission with special tools 23 4 050 and 00 2 030 .

Secure transmission to mounting with tensioning strap (1).

Tasks are described in TRANSMISSION HOLDER .

Fig 9: Supporting Transmission Using Special Tools 23 4 050

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Release screw (1) on left and right of axle.

Remove cover plate (2) on left and right of axle.

Remove bolt (3) on left and right of axle.

Tightening torque 31 10 1AZ .

Fig 10: Identifying Screw, Cover Plate And Bolt

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Screw on special tool 11 8 910 .

Fig 11: Identifying Special Tool (11 8 910)

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Adjust distance (1) between cross bar and facing using nuts (2).

Nuts (2) must be screwed down in opposite direction after distance has been adjusted.

IMPORTANT:

Distance:

38.5 mm (N55 engine)

Fig 12: Identifying Distance Between Cross Bar And Nut

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Undo bolts (1) for gearbox mount.

Tightening torque 22 32 10AZ .

Fig 13: Identifying Undo Bolts

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Release screws.

Remove transmission cross-member (1).

Tightening torque 22 32 3/4AZ .

Fig 14: Locating Transmission Cross-Member Screw

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Unplug connector (1) from transfer box control unit (longitudinal torque module).

Release screw (2).

Remove earth strap (3).

Fig 15: Identifying Connector, Screw And Earth Strap

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Unlock and disconnect connector (1) by turning.
Do not touch pins.
Release cable from brackets.
Insert special tool 24 2 390 in sealing sleeve.

Repair work is described in:

NOTES ON MECHATRONICS

IMPORTANT: Read and comply with important notes in the procedural information.

Fig 16: Disconnecting Connector

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Release bolts and remove transmission.

Steel screws, tightening torque 24 00 1AZ .

Aluminium screws, tightening torque 24 00 2AZ .

Installation note:

Observe screw fastening sequence without fail.

Fig 17: Transmission Housing Bolts Tightening/Loosening Sequence

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Installation note:

Tighten down screws/bolts to specified torque.

Special angle-of-rotation tool 00 9 120 with magnet 00 9 130 to vehicle underbody and screw down blue aluminium screws/bolts in accordance with angle of rotation.

Angle of rotation 24 00 2AZ .

Fig 18: Tightening Screws/Bolts

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Installation note:

Bore hole (1) of drive plate must be accessible from recess on engine oil sump. Check fitting sleeves (2...3) for correct seating.

Replace damaged fitting sleeves.

NOTE: Graphic representation similar.

Fig 19: Identifying Sleeves Of Engine Oil Sump

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Installation note:

Rotate torque converter until bore hole in torque converter is flush with bore hole in drive plate.

Flange automatic transmission to engine.