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 at front and rear. See 51 47 490 REMOVING AND INSTALLING/REPLACING FRONT UNDERBODY PROTECTION and 51 47 491 REMOVING AND INSTALLING/REPLACING REAR UNDERBODY PROTECTION .
Remove EXHAUST SYSTEM .
Remove heat shields.

Unfasten screws (2).

Remove cross member (1)

Fig 1: Cross Member Screws

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Release screw (1).

Remove holder (2).

Fig 2: Holder Screw

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Release screws (1).

Tightening torque: 24 11 6AZ .

Remove the protective plate (2).

Fig 3: Protective Plate Screws

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Release screw (1) from ground strap (2).

Tightening torque: 24 11 7AZ .

Fig 4: Ground Strap Screw

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Release screw (1).

Tightening torque: 17 22 1AZ .

Disconnect hydraulic lines (2) to transmission oil cooler.

Installation note :

Replace sealing rings.

Fig 5: Cross Member Screws

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Version 1:

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 6: Bracket, Catalytic Converter, Nuts, Screws

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Version 2:

Unscrew nuts (1).

Tightening torque: 18 20 1AZ .

Unfasten screws (2).

Tightening torque: 18 20 2AZ .

Remove holder (3) for catalytic converter.

Fig 7: Catalytic Converter Holder, Nuts And Screws

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Release screws (1).

Tightening torque: 24 00 3AZ .

Remove cover plate (2) downwards.

Remove cover.

Fig 8: Cover Plate Screws

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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 9: 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.

Fig 10: Removing Knurled Screw From Special Tool (2 222 741)

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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.

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 11: 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 12: Supporting Transmission Using Special Tools (23 4 050)

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Release nuts (1) and screws (2).

Tightening torque: 22 32 3/4AZ .

Fig 13: Transmission Nuts And Screws

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NOTE: Partially remove PROPELLER SHAFT .
Disconnect propeller shaft at transmission.
Release center mount.
Tie up the propeller shaft to the vehicle underbody.

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

Release screws.

Tightening torque: 24 00 1AZ

Fig 14: Transmission Housing Bolts Tightening/Loosening Sequence

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Installation note :

Check that fitting sleeves (1) are correctly seated.

Replace damaged fitting sleeves.

Fig 15: 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.