23 00 028 Removing and installing transmission (GS6-45BZ) N55 4WD

WARNING: This page does not describe the selected car, but rather 24 other vehicles, including the 2018 BMW 320i xDrive, 2018 BMW 320i, 2017 BMW 320i xDrive, 2017 BMW 320i, and 2016 BMW 335i xDrive. However, it is still accessible from the selected car via links, so may be relevant.

Special tools required:

23 4 050
00 2 030
00 9 010
00 9 120
00 9 130
21 2 240

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 manual gearbox.

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:

Remove REINFORCEMENT PLATE .
Remove TRANSFER BOX .
Support the engine when removing the transmission.

Unscrew nuts (1).

Release holder (2) and ground strap (3) from vehicle underbody.

Nut (ground strap on body) tightening torque 23 11 8AZ .

Fig 1: Identifying Nuts, Holder And Ground Strap

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Release screws (1).

Remove strut (2).

Similar to graphic.

Fig 2: Identifying Screws And Strut
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Release aluminum screws (1) on transmission.

Tightening torque 23 00 1AZ .

Unscrew nuts (2).

Tightening torque 18 20 1AZ .

Remove bracket (3).

Fig 3: Identifying Aluminum Screws, Nuts And Bracket

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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 .

Fig 4: Supporting Transmission With Special Tools (23 4 050)

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NOTE: Pressure line of clutch slave cylinder remains connected.

IMPORTANT: Relieve tension on clutch slave cylinder slowly; otherwise air will be drawn in through sealing cup.

Release nuts and remove clutch slave cylinder.

Tightening torque 21 52 1AZ .

Fig 5: Locating Clutch Slave Cylinder Nuts

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Lift off retainer (2).

Detach gearshift rod (1).

Installation note:

Grease gearshift rod.

Grease, refer to MANUAL TRANSMISSION -- OPERATING FLUIDS

Fig 6: Detaching Gearshift Rod

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IMPORTANT: Retaining clip must interlock captively with retaining web (1) behind gearshift rod pin.

Fig 7: Identifying Retaining Web

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Unlock bearing journal (1) in direction of arrow and remove.

Lift out gearshift arm.

Installation note:

Grease bearing journals (1).

Grease, refer to MANUAL TRANSMISSION -- OPERATING FLUIDS .

Fig 8: Removing Bearing Journal

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Disconnect plug connection (1) on zero gear sensor.

Release all lines from holder.

Fig 9: Identifying Zero Gear Sensor Plug Connection

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Release screws.

In vehicles with an N54/N55 engine from production date 09/2012, only steel bolts are installed.

Steel screws (1, 2, 4, 5, 6, 9), tightening torque 23 00 1AZ .

Release aluminum screws with special tool 00 9 010.

Aluminum screws (3, 6, 7, 8), tightening torque 23 00 1AZ .

Graphic similar.

IMPORTANT: Do not allow transmission to hang on transmission input shaft when removing and installing, as the clutch disc will be deformed. Pull transmission downwards and remove.

Fig 10: 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 aluminum screws/bolts in accordance with angle of rotation.

Angle of rotation 23 00 1AZ .

Fig 11: Checking Angle Of Rotation With Angle-Of-Rotation Tool (00 9 120)

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Installation note:

Check that fitting sleeves are correctly fitted.

Replace damaged fitting sleeves.

Fig 12: Identifying Fitting Sleeves

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Installation note:

Check lubrication of transmission input shaft for sticky consistency. If grease is sticky, clean input shaft and REPLACE CLUTCH DISC .

Check clutch disc for frictional corrosion in gearing and replace IF NECESSARY .

Remove any grease and lining abrasion from gearing of clutch disc by mechanical means (with a cloth).

Fig 13: Locating Transmission Input Shaft

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Installation note:

Greasing specification:

Remove and clean RELEASE BEARING AND RELEASE LEVER .
Push on grease scraper ring 21 2 240 to the limit position.
Grease gearing (1) of input shaft with a brush.
Grease, refer to MANUAL TRANSMISSION -- OPERATING FLUIDS .
Detach grease scraper ring.

Fig 14: Locating Input Shaft Gearing
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