23 00 017 Removing and installing transmission (GS6-17BG) N20

Special tools required :

00 2 030
00 9 120
00 9 130
21 2 220
23 4 050

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 work, check transmission fluid level.
Use only the APPROVED TRANSMISSION OIL .
Failure to comply with this requirement will result in serious damage to the manual gearbox.

Necessary preliminary tasks :

CLAMP OFF BATTERY .
Remove underbody protection at front and rear. See REMOVING FRONT UNDERBODY PROTECTION and REMOVING REAR UNDERBODY PROTECTION .
Remove complete EXHAUST SYSTEM .
Partially remove PROPELLER SHAFT .
- Disconnect propeller shaft at transmission.
- Release center mount.
- Tie back 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

Release screws (1).

Tightening torque 23 00 1AZ .

Fig 1: Identifying Screws

Courtesy of BMW OF NORTH AMERICA, INC.

Release nuts (1).

Tightening torque 18 20 1AZ .

Unfasten screws (2).

Tightening torque 18 20 2AZ .

Remove bracket (3).

Slacken nut (4).

Tightening torque 23 11 8AZ .

Release ground strap from transmission.

Fig 2: Identifying Nuts, Screws And Bracket

Courtesy of BMW OF NORTH AMERICA, INC.

Unscrew holder (1).

Fig 3: Identifying Holder

Courtesy of BMW OF NORTH AMERICA, INC.

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 (2) and remove clutch slave cylinder (1).

Tightening torque 21 52 1AZ .

Fig 4: Identifying Clutch Slave Cylinder Nuts

Courtesy of BMW OF NORTH AMERICA, INC.

Detach connector (1) from reverse gear switch.

Detach cables from brackets on transmission.

Fig 5: Locating Reverse Gear Switch 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 Gearbox holder.

After completion of work, check transmission fluid level.

Fig 6: Supporting Transmission Using Special Tools (23 4 050/00 2 030)

Courtesy of BMW OF NORTH AMERICA, INC.

Release screws (1).

Tightening torque 22 32 3AZ .

Fig 7: Identifying Screws

Courtesy of BMW OF NORTH AMERICA, INC.

Detach retaining clip.

Fig 8: Detaching Retaining Clip

Courtesy of BMW OF NORTH AMERICA, INC.

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

Fig 9: Identifying Retaining Web

Courtesy of BMW OF NORTH AMERICA, INC.

Pull gearshift rod (1) out of gearshift rod joint (2).

Installation note :

Grease gearshift rod pin (3).

Grease: refer to OPERATING FLUIDS .

Fig 10: Identifying Shift Rod, Shift Rod Joint And Shift Rod Pin

Courtesy of BMW OF NORTH AMERICA, INC.

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

Fig 11: Unlocking Bearing Journal

Courtesy of BMW OF NORTH AMERICA, INC.

Lift out gearshift arm (1).

Installation note :

Grease bearing journal.

Grease: refer to OPERATING FLUIDS .

Fig 12: Lifting Out Gearshift Arm

Courtesy of BMW OF NORTH AMERICA, INC.

Release screws.

Installation note :

Tightening torque, steel screws 23 00 1AZ .

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

Fig 13: Locating Screws

Courtesy of BMW OF NORTH AMERICA, INC.

Installation note :

Check fitting sleeves (1 and 2) for correct fit.

Replace damaged sleeves.

Ensure correct position of cover plate.

Fig 14: Identifying Fitting Sleeves

Courtesy of BMW OF NORTH AMERICA, INC.

Installation note :

Check lubrication of transmission input shaft for sticky consistency. If grease is sticky, clean drive 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).

Fig 15: Inspecting Transmission Input Shaft

Courtesy of BMW OF NORTH AMERICA, INC.

Installation note :

Greasing specification:

Remove and clean release bearing and release lever (do not grease).
Push on grease scraper ring 21 2 220 until limit position.
Grease gearing (1) of input shaft with a brush.
Grease: refer to OPERATING FLUIDS .
Detach grease scraper ring.

Fig 16: Locating Input Shaft And Grease Scraper Ring
Courtesy of BMW OF NORTH AMERICA, INC.