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

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!

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: Aluminium screws/bolts must be replaced each time they are released .

Aluminium screws/bolts are permitted with and without color coding (blue).

For reliable identification:

Aluminium 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:

Disconnect the BATTERY
Remove FAN COWL
Remove underbody protection
Remove REINFORCEMENT PLATE
Important installation notes are described in this job item
Release hose socket from charge air cooler on left and right.
Remove EXHAUST SYSTEM
Remove heat shields
Remove PROPELLER SHAFT FROM FRONT AXLE DIFFERENTIAL
Detach PROPELLER SHAFT at gearbox, release center bearing
Tie up 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

Remove upper part of cable duct (1).

Fig 1: Identifying Cable Duct Upper Part

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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 2: Identifying Transmission Oil Cooler Hydraulic Lines And Screw

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Release holder (1).

Detach hydraulic lines (2) from bracket (1).

Fig 3: Identifying Hydraulic Lines From Bracket

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Release screws (1).

Tightening torque 24 00 1AZ .

Slacken nut (2).

Remove bracket (3).

Fig 4: Identifying Bracket, Nut And Screws

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Release screws (1).

Remove holder (2).

Remove heat shield (3).

Fig 5: Identifying Heat Shield, Holder And Screws

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

Fig 6: 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 7: Inserting Special Tool 24 4 160 Into Recess Of Transmission Housing

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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 .

After completion of work, check transmission fluid level.

Fig 9: Supporting Transmission Using Special Tools

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Release screws.

Tightening torque 22 32 3/4AZ .

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

Fig 12: Identifying Vibration Damper Screw

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Tightening torque 24 40 1AZ .

Note installed position of brackets (1 and 2) when removing gearbox.

Fig 13: Identifying Gearbox Brackets

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Release screws.

Installation note:

Observe screw fastening sequence without fail.

Tightening torque, steel screws 24 00 1AZ .

Aluminium screws must be replaced.

Tightening torque and angle of rotation

Aluminium screws 24 00 2AZ (7, 8, 9, 10, 11)

Fig 14: Automatic Transmission Screws Tightening Sequence

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Installation note:

Bore hole (1) of driving plate must be accessible from recess on engine oil sump. Check that fitting sleeves (2...3) are correctly seated.

Replace damaged fitting sleeves.

NOTE: Similar to graphic.

Fig 15: Identifying Driving Plate Bore Hole And 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.