24 00 034 Removing And Installing Automatic Transmission (GA8HP70Z) N57 AWD

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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 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!

Necessary preliminary tasks:

Disconnect the battery . See 61 20 900 DISCONNECTING AND CONNECTING BATTERY NEGATIVE LEAD or 61 20... INFORMATION ON AGM BATTERY .
Remove underbody protection at front and rear. See 51 47 490 REMOVING AND INSTALLING/REPLACING UNDERBODY PROTECTION (FRONT) or 51 47 491 REMOVING AND INSTALLING/REPLACING REAR UNDERBODY PROTECTION .
Remove REINFORCEMENT PLATE .
Remove complete EXHAUST SYSTEM .
Remove STARTER MOTOR .
REMOVE front propeller shaft.
Detach PROPELLER SHAFT at transfer box, release center mount.
Tie back propeller shaft to 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.

Release screws (1).

Tightening torque: 24 00 1AZ .

Fig 1: Automatic Transmission Mounting Screws

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Release screws (1).

Unscrew holder (2).

Tightening torque: 24 00 1AZ .

Fig 2: Automatic Transmission Holder And Screws

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Pay attention to installation position of bracket (2) when undoing gearbox bolt (1).

Fig 3: Gearbox Bolt And Bracket

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Crank engine with special tool 11 6 480 at the vibration damper in direction of rotation until screw (1) is visible in the 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 4: Torque Converter Bolt

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

Fig 5: Installing 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.

Tighten screw (1).

Fig 6: Inserting Special Tool (24 4 160) Into Transmission Housing

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Release screw (1).

Release holder with transmission fluid lines.

Fig 7: Transmission Fluid Line And Screw

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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.

Fig 8: Transmission Oil Cooler Hydraulic Lines And Screw

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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 9: Axle Cover Plate, Screw And Bolt

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Screw on special tool 11 8 910 .

Fig 10: 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: N57 37 mm

Fig 11: Cross Bar And Nuts Distance

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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).

Repair work is described in GEARBOX HOLDER .

Fig 12: Supporting Transmission Using Special Tools

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Undo bolts (1) for gearbox mount.

Tightening torque: 22 32 10AZ .

Fig 13: Gearbox Mount Bolts

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Release screws.

Tightening torque: 22 32 3/6AZ .

Remove cross member.

Fig 14: 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 15: Transfer Box Control Unit Connector, Screw And Earth Strap

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Unlock connector (1) by turning and disconnect.
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 note.

Fig 16: Disconnecting Automatic Transmission Connector

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Release bolts and remove transmission.

Tightening torque: 24 00 1AZ .

Installation note:

Screws have different lengths.

Note installation position.

Fig 17: Transmission Mounting Bolts

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Installation note:

Bore hole in drive plate disc must be accessible from recess on oil sump.

Check that fitting sleeves (1) are correctly seated.

Replace damaged fitting sleeves.

Fig 18: Fitting Sleeves

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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.