24 00 034 Removing and installing automatic transmission (GA8HP70Z) N63 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 transmission oil vapors.
Wear protective gloves.
Ensure adequate ventilation

IMPORTANT: After completion of 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 . See 61 20 900 DISCONNECTING AND CONNECTING BATTERY EARTH LEAD or 61 20... INFORMATION ON AGM BATTERY
Remove both INTAKE SILENCER HOUSINGS
Remove underbody protection . See 51 47 491 REMOVING REFITTING/REPLACING REAR ENGINE UNDERCOVER or 51 47 490 REMOVING AND INSTALLING/REPLACING FRONT UNDERBODY PROTECTION at front and rear
Remove REINFORCEMENT PLATE Important installation notes are described in this job item
Remove EXHAUST SYSTEM
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 screw (1).

Remove cover (2).

Tightening torque, 24 00 1AZ .

Fig 1: Identifying Screws And Cover

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When unflanging the gearbox, pay attention to installation position of rubber connectors (1).

Fig 2: Identifying Rubber Connectors

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Release screw (1) and remove crankshaft sensor.

Disengage cable from holder (2).

Fig 3: Identifying Cable Screw From Holder

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Slacken nut (1).

Undo hydraulic line and holder.

Fig 4: Identifying Slacken Nut

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Release screw (1).

Disconnect hydraulic lines (2) to transmission oil cooler.

Installation note:

Replace sealing rings.

Keep to installation sequence.

Fig 5: Identifying Hydraulic Lines And 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 .

Fig 6: Identifying Vibration Damper Screw

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Prepare special tool (1) 24 4 161 (A) with shaped element (2) 24 4 166 as pictured.

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: Identifying Special Tool 24 4 160

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Screw on special tool 11 8 910 .

Tightening torque 31 10 1AZ .

Fig 9: Screwing 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:
N63 38 mm

Fig 10: Identifying Distance Between Cross Bar And Facing

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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 are described in GEARBOX HOLDER .

After completion of work, check transmission fluid level.

Fig 11: Supporting Transmission Using Special Tools 23 4 050

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Release screws.

Remove transmission cross-member (1).

Tightening torque 22 32 3/4AZ .

Fig 12: Locating Transmission Crossmember Screws

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

Release screw (2).

Remove earth strap (3).

Fig 13: Identifying Transfer Box Control Unit Connector, Earth Strap And Screw

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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.

Operations are described in: 24 34... Notes on mechatronics (GA8HP45Z, GA8HP70Z, GA8HP90Z)

IMPORTANT: Read and comply with important note.

Fig 14: Releasing Cable From Brackets

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Lower engine with transmission.

Secure engine and transmission in lowered position with engine support beam.

Then support transmission.

Release screws.

Tightening torque 24 00 1AZ .

Unflange transmission.

Fig 15: Locating Transmission Screws

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Installation note:

Bore (1) in drive plate must be accessible from opening in transmission housing. Check that fitting sleeves (2) are correctly fitted.

Replace damaged fitting sleeves.

Fig 16: Identifying Sleeves And Bore

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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.