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

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 fuel vapors.
Wear protective gloves.
Ensure adequate ventilation.

IMPORTANT: After completion of repair 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 :

Clamp off BATTERY .
Remove REINFORCEMENT PLATE .
Remove EXHAUST SYSTEM .
Remove heat shields.
Remove FRONT PROPELLER SHAFT .
Partially remove propeller shaft . See 26 11 000 COMPLETELY REMOVING AND INSTALLING PROPELLER SHAFT (INSERTED - REAR FLEXIBLE DISC) (WITHOUT VIBRATION ABSORBER) or 26 11 000 REMOVING AND INSTALLING PROPELLER SHAFT (INSERTED) COMPLETELY .
- Disconnect propeller shaft at transmission.
- Release center mount.
- Tie up propeller shaft to underbody.
  NOTE: Bending the propeller shaft by an excessive angle can cause premature damage to the joint/propeller shaft!

Release nut (1) and ground strap (2) from bolt.

Tightening torque: 24 11 7AZ .

Release nut (6) and remove holder (5).

Release screws (3) and remove heat shield (4).

Tightening torque: 24 11 6AZ .

Fig 1: Heat Shield, Ground Strap, Bolt, Screws

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Release aluminum screws (1).

Tightening torque: 24 00 1AZ .

Unscrew nuts (3).

Tightening torque: 18 20 1AZ .

Remove holder (2).

Fig 2: Holder, Aluminum Screws And Nuts

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Remove protective cap from recess.

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

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

Tightening torque: 24 40 1AZ .

Installation note :

Replace screws (remove adhesive residue in thread if necessary).

Fig 3: Vibration Damper Screw

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Prepare special tool (1) 24 4 161 (A) with shaped element (2) 24 4 164 as pictured.

Fig 4: Special Tool (24 4 161/24 4 164) With Shaped Element

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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 5: Inserting Special Tool (24 4 160) Into Transmission Housing Recess

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Release screw (1).

Loosen the hydraulic lines (2).

Tightening torque: 17 22 1AZ .

Installation note :

Replace sealing rings.

Fig 6: Hydraulic Lines Screw

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Unlock and disconnect connector (1) by turning.
- Do not touch pins!
Insert special tool 24 2 390 in sealing cup.

Tasks are described in Gearbox holder.

NOTES ON MECHATRONICS

IMPORTANT: Read and comply with important note.

Fig 7: Disconnecting Connector

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Supporting transmission :

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

Secure transmission to mounting with tensioning strap (1).

Tasks are described in TRANSMISSION BRACKET .

Fig 8: Supporting Transmission Using Special Tools (23 4 050/00 2 030)

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Disconnect connector (2) from the longitudinal torque module.

Release screws (1).

Tightening torque: 22 32 3AZ .

Fig 9: Longitudinal Torque Module Connector

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Release wiring harness (1) from holder.

Fig 10: Holder Wiring Harness

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Release bolts and remove transmission.

Steel screws, tightening torque: 24 00 1AZ .

Aluminum screws, tightening torque: 24 00 2AZ .

Installation note :

Note installation locations of screws.

Fig 11: Transmission Bolts

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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 aluminum screws/bolts in accordance with angle of rotation.

Angle of rotation 24 00 2AZ .

Fig 12: Tightening Screws/Bolts

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Installation note :

Check fitting sleeves (2 and 3) for correct fit.

Replace damaged fitting sleeves.

Bore hole (1) of driving plate must be accessible from recess on engine oil sump.

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

Fig 13: Driving Plate Bore Hole

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Flange automatic transmission to engine.