24 00 030 Removing and installing automatic transmission (GA6HP19Z) (N54)

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 work, check TRANSMISSION OIL LEVEL .

Use only approved TRANSMISSION OIL .

Failure to comply with this instruction will result in serious damage to the transmission.

IMPORTANT:

For vehicles with N54/N55 engine up to production date 09/2012, aluminium 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:

Aluminum screws/bolts must be renewed each time they are released .

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

For reliable identification:

Aluminum 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:

Clamp off BATTERY .
Remove underbody protection at front and rear. See REMOVING FRONT UNDERBODY PROTECTION and REMOVING REAR UNDERBODY PROTECTION .
Remove EXHAUST SYSTEM .
Remove OXYGEN SENSOR , cylinders 1-3
Support engine with lifter when removing transmission

Release screws (1).

Remove holder (2).

Fig 1: Identifying Screws And Holder

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Unfasten ground strap (1).

Remove retaining plates (2).

Fig 2: Identifying Retaining Plate

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Release screws (1).

Remove retaining plate (2).

Fig 3: Identifying Screws And Retaining Plate

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Unfasten nut.

Disconnect cable (1).

Installation note:

Unfasten nut.
Adjust cable by means of holder (2) until distance A== 1 mm is obtained.
Tighten nut.

Fig 4: Locating Cable Nut

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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 5: Identifying Screw And Hydraulic Lines

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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.

Tightening torque 24 40 1AZ .

Fig 6: Identifying Screw Of Vibration Damper

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Disconnect plug connector (1).

Unfasten screws (2).

Remove cover plate (3).

Tightening torque 24 00 1AZ .

Fig 7: Identifying Connector, Screws, And Cover Plate

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Release aluminium screw (1) on right next to cable retaining plate with special tool 00 9 010 .

Aluminium screws must be replaced.

Tightening torque 24 00 2AZ .

Fig 8: Identifying Aluminium Bolt

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Prepare special tool (1) 24 4 161 (A) with shaped element (2) 24 4 165 , side (B) to (A).

Fig 9: Preparing 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 10: 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.

Repair work is described in:

NOTES ON MECHATRONICS

Fig 11: Disconnecting Connector

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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 12: Identifying Screw, Cover Plate And Bolt

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Screw on special tool 11 8 910 .

Fig 13: Identifying 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: 38.5 mm

Fig 14: Identifying Distance Between Cross Bar And Nuts

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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 GEARBOX HOLDER .

After completion of work, check transmission oil level.

Fig 15: Supporting Transmission Using Special Tools (23 4 050)

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Release screws (1) and (2).

Remove transmission cross member.

Tightening torque 22 32 3/4AZ .

Fig 16: Identifying Transmission Cross Member Mounting Screws

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Remove PROPELLER SHAFT

NOTE:

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

Support engine with lifter when removing transmission.

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/bolts 24 00 2AZ (7, 8, 9, 10, 11).

Fig 17: Transmission Housing Bolts Tightening/Loosening Sequence

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Installation note:

Tighten down screws/bolts to specified torque.

Special angle-of-rotation tool 00 9 120 with magnet 00 9 130 to vehicle underbody and screw down blue aluminium screws/bolts in accordance with angle of rotation.

Angle of rotation 24 00 2AZ .

Fig 18: Attaching Special Tool (00 9 120) For Angle Of Magnet

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Installation note:

Bore hole (1) of drive plate must be accessible from recess on engine oil sump. Check fitting sleeves (2...3) for correct seating.

Replace damaged fitting sleeves.

Fig 19: Identifying 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 driving plate.

Flange automatic transmission to engine.