24 00 033 Removing and installing automatic transmission (GA8HP45Z) (N20)

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: 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!

Necessary preliminary tasks:

Clamp off BATTERY .
Remove underbody protection . See 51 47 490 REMOVING AND INSTALLING/REPLACING FRONT UNDERBODY PROTECTION or 51 47 491 REMOVING AND INSTALLING/REPLACING REAR UNDERBODY PROTECTION at front and rear.
Remove REINFORCEMENT PLATE .
Important notes on installation are described in this work step.
Remove EXHAUST SYSTEM .
Remove front PROPELLER SHAFT .
Disconnect PROPELLER SHAFT at transmission, release center mount.
Note:
Bending the propeller shaft by an excessive angle can cause premature damage to the joint/propeller shaft!
Tie up the propeller shaft to the vehicle underbody.
Support engine with lifter when removing transmission.

Release screw (1).

Remove holder (2).

Fig 1: Identifying Automatic Transmission Holder And Screw

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Release screws (1).

Tightening torque 24 11 6AZ .

Remove the protective plate (2).

Fig 2: Identifying Protective Plate Screws

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Release screw (1).

Disconnect hydraulic lines (2) to transmission oil cooler.

Tightening torque 17 22 3AZ .

Installation note:

Replace sealing rings.

Fig 3: Identifying Hydraulic Lines To Transmission Oil Cooler And Screw

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Unscrew nuts (1).

Tightening torque 18 20 1AZ .

Unfasten screws (2).

Tightening torque 18 20 2AZ .

Remove bracket (3) and catalytic converter (5).

Unscrew nuts (4).

Tightening torque 18 20 1AZ .

Remove rubber mounts for catalytic converter.

Fig 4: Identifying Catalytic Converter, Bracket, Nut And Screw

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Release screws (1).

Tightening torque 24 00 3AZ .

Remove cover plate (2) downwards.

Remove cover.

Fig 5: Identifying Cover Plate Screw

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

Undo all 6 bolts on torque converter.

Tightening torque 24 40 1AZ .

IMPORTANT: Replace all 6 bolts on torque converter.

Fig 6: Identifying Vibration Damper Screw

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Unscrew knurled screw (1) from special tool 2 222 741 (do not remove completely) before inserting in the recess of the transmission housing.

Insert special tool 2 222 741 and shaped element (3) in the recess.

Slightly tighten knurled nut (2).

Screw in knurled screw (1) fully.

Locating pin (4) must be located between converter and engine.

Move special tool 2 222 741 in the recess until the locating pin (4) rests against the converter.

Use knurled nut (2) to fix special tool 2 222 741 and converter in position.

Fig 7: Inserting Special Tool (2 222 741)

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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 cup.

Tasks are described in Gearbox holder.

NOTES ON MECHATRONICS

IMPORTANT: Read and comply with important note.

Fig 8: 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 9: Supporting Transmission Using Special Tools

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Release screws.

Tightening torque 22 32 3/6AZ .

Remove cross member.

Fig 10: Locating Cross Member Screws

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

Release screw (2).

Remove earth strap (3).

Fig 11: Identifying Transfer Box Control Unit Connector, Earth Strap And Screw

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Release screws.

Tightening torque 24 00 1AZ

Fig 12: Automatic Transmission Screws Tightening Sequence

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Installation note:

Check that fitting sleeves (1) are correctly seated.

Replace damaged fitting sleeves.

Fig 13: Identifying Fitting Sleeves

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Installation note:

Twist torque converter until bore hole in torque converter is flush with bore hole of flywheel.

Flange automatic transmission to engine.