23 00 028 Removing and installing transmission (GS6-45BZ) (N55)
Special tools required:
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.
Use only the approved transmission oil. See MANUAL TRANSMISSION -- OPERATING FLUIDS .
Failure to comply with this requirement will result in serious damage to the manual gearbox.
As of production date 09/2012, only steel bolts are installed for the securing of the transmission.
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 FRONT UNDERBODY PROTECTION
- Remove REAR UNDERBODY PROTECTION
- Remove complete EXHAUST SYSTEM
- Remove heat shields
- Release hose sockets from charge air cooler on left and right
- Disconnect coolant hose from front axle
- Support engine with jack when removing gearbox
Remove upper part of cable duct (1).
Remove holder (1-3).
Release screws (1).
Disconnect connector (2).
Steel screws, tightening torque: 23 00 1AZ .
Aluminum screws, tightening torque: 23 00 2AZ .
Release aluminum screws with special tool 00 9 010 .
Release screws (1).
Remove holder (2).
Unlock connector (1) from reversing light switch and detach.
Release cable from brackets.
Release screws (3).
Remove exhaust bracket (2).
Tightening torque: 23 9 5AZ .
Supporting transmission
Support transmission with special tools 23 4 050 and 00 2 030 .
Secure transmission to mounting with tensioning strap (1).
Tasks are described in Gearbox holder. See 23... UNIVERSAL BMW TRANSMISSION TAKE-UP .
After completion of work, check transmission fluid level.
Release bolts (1) and nuts (2) and remove cross-member.
Tightening torque: 23 9 2AZ .
- REMOVE propeller shaft from transmission.
- Release center mount.
- Note:
- Bending the propeller shaft by an excessive angle can cause premature damage to the joint/propeller shaft!
- Tie up propeller shaft to underbody.
Release nuts and remove clutch slave cylinder.
Tightening torque: 21 52 5AZ .
Lift off retainer (2).
Detach gearshift rod (1).
Installation note:
Grease gearshift rod.
Grease, refer to BMW Service Operating Fluids. See MANUAL TRANSMISSION -- OPERATING FLUIDS .
Unlock bearing journal (1) in direction of arrow and remove.
Lift out gearshift arm.
Installation note:
Grease bearing journals (1).
Grease, refer to BMW Service Operating Fluids. See MANUAL TRANSMISSION -- OPERATING FLUIDS .
Release screws.
In vehicles with an N54/N55 engine from production date 09/2012, only steel bolts are installed.
Steel screws, tightening torque: 23 00 1AZ .
Aluminum screws/bolts (3, 4, 5, 9, 10), tightening torque: 23 00 2AZ .
Installation note:
Tighten down screws/bolts to specified torque.
Special angle-of-rotation tool 00 9 120 with magnet 00 9 130 .
Secure to vehicle underbody and screw down aluminum screws/bolts in accordance with angle of rotation.
Angle of rotation 23 00 2AZ .
Installation note:
Check that fitting sleeves are correctly fitted.
Replace damaged fitting sleeves.
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 friction rust in gearing and REPLACE IF NECESSARY .
Remove any grease and lining abrasion from gearing of clutch disc by mechanical means (with a cloth).
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. Refer to BMW Service Operating Fluids. See MANUAL TRANSMISSION -- OPERATING FLUIDS .
- Detach grease scraper ring.