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

Special tools required:

IMPORTANT: To prevent severe damage to the engine block, the protruding threads of the transmission bolts must be strictly checked for corrosion and damage before removal .
If there are signs of corrosion, the rust must be removed and the threads must be cleaned before removal .
Replace rusted, damaged bolts.

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: Aluminum screws/bolts must be replaced 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 51 47 490 REMOVING AND INSTALLING/REPLACING FRONT UNDERBODY PROTECTION or 51 47 491 REMOVING AND INSTALLING/REPLACING REAR UNDERBODY PROTECTION .
REMOVE EXHAUST SYSTEM .
Remove heat shields.
Partially remove PROPELLER SHAFT .

Disconnect propeller shaft at transmission.
Release center mount.
Tie up propeller shaft to underbody.

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

Unfasten screws (2).

Remove cross member (1)

Fig 1: Identifying Cross Member And Screws

Courtesy of BMW OF NORTH AMERICA, INC.

Release nut (1) and ground strap (2) from bolt.

Tightening torque: 24 11 7AZ .

Release nut (6) and remove holder (5).

Release screws (3) and remove heat shield (4).

Tightening torque: 24 11 6AZ .

Fig 2: Identifying Heat Shield, Nut And Screws

Courtesy of BMW OF NORTH AMERICA, INC.

Remove cover (1).

Release aluminum screws (2).

Tightening torque: 24 00 2AZ .

Unscrew nuts (3).

Tightening torque: 18 20 1AZ .

Remove holder (4).

Installation note:

Aluminum screws (2) must be replaced.

Fig 3: Identifying Cover And Aluminum Screws

Courtesy of BMW OF NORTH AMERICA, INC.

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

Release 6 bolts of torque converter with special tool 24 1 110 .

Tightening torque: 24 40 1AZ .

Installation note:

Replace screws (remove adhesive residue in thread if necessary).

Fig 4: Identifying Screw

Courtesy of BMW OF NORTH AMERICA, INC.

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 24 1 370 and shaped element (3) in the recess.

Slightly tighten knurled nut (2).

Screw in knurled screw (1) fully.

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.

Fig 5: Identifying Knurled Screw, Knurled Nut And Pin

Courtesy of BMW OF NORTH AMERICA, INC.

Use knurled nut (2) to fix special tool 2 222 741 and converter in position.

Release screw (1).

Disconnect hydraulic lines (2) to transmission oil cooler.

Tightening torque: 17 22 1AZ .

Installation note:

Replace sealing rings.

Fig 6: Identifying Transmission Oil Cooler Hydraulic Lines And Screw

Courtesy of BMW OF NORTH AMERICA, INC.

Unlock and disconnect connector (1) by turning.
- Do not touch pins!
Insert special tool 24 2 390 in sealing cup.
Release cable of transmission connector and starter from brackets.

Tasks are described in Gearbox holder.

NOTES ON MECHATRONICS

IMPORTANT: Read and comply with important note.

Fig 7: Disconnecting Connector

Courtesy of BMW OF NORTH AMERICA, INC.

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 8: Supporting Transmission With Special Tools (23 4 050, 00 2 030)

Courtesy of BMW OF NORTH AMERICA, INC.

Release screws (3).

Tightening torque: 22 32 3AZ .

Fig 9: Identifying Tensioning Strap And Screws

Courtesy of BMW OF NORTH AMERICA, INC.

Release bolts and remove transmission.

Steel screws, tightening torque: 24 00 1AZ .

Aluminum screws, tightening torque: 24 00 2AZ .

Installation note:

Note installation locations of screws.

Fig 10: Locating Screws

Courtesy of BMW OF NORTH AMERICA, INC.

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 aluminum screws/bolts in accordance with angle of rotation.

Angle of rotation 24 00 2AZ .

Fig 11: Identifying Special Tool (00 9 120) And Magnet (00 9 130)

Courtesy of BMW OF NORTH AMERICA, INC.

Installation note:

Check fitting sleeves (2 and 3) for correct fit.

Replace damaged fitting sleeves.

Bore hole (1) of driving plate must be accessible from recess on engine oil sump.

Rotate torque converter until bore hole in torque converter is flush with bore hole in drive plate.

Flange automatic transmission to engine.

Fig 12: Identifying Driving Plate Bore Hole And Fitting Sleeves

Courtesy of BMW OF NORTH AMERICA, INC.