23 00 019 Removing and Installing Transmission (GS6-37BZ)
23 00 019 - Removing and installing transmission (GS6-37BZ) N51/N52/N52K/N53
Special tools required:
Important!
After completion of work, check gear oil level 00 11 ... Draining/Topping Up Gear Oil in Manual Transmission.
Use only the approved gear oil.
Failure to comply with this requirement will result in serious damage to the manual transmission.
Important!
Aluminium-magnesium materials.
No steel screws/bolts may be used due to the threat of electrochemical corrosion.
A magnesium crankcase requires aluminium screws/bolts exclusively.
Aluminium screws/bolts must be replaced each time they are released.
Aluminium screws/bolts are permitted with and without colour coding (blue).
For reliable identification:
Aluminium screws/bolts are not magnetic.
Jointing torque and angle of rotation must be observed without fail (risk of damage).
Necessary preliminary tasks:
- Remove underbody protection at front and rear with brackets.
- Remove front underbody protection Removing and Installing/Replacing Front Underbody Protection
- Remove rear underbody protection Removing and Installing/Replacing Rear Underbody Protection (with brackets)
- Remove centre muffler (N53 only)
- Remove complete exhaust system Service and Repair
- Remove heat shields
- Support engine with lifter when removing transmission
Release screws (1).
Remove exhaust system bracket (2).
Tightening torque 23 71 4AZ 23 71 Transmission Mounts.
Note:
Illustration similar
Detach plug (1) from reversing light switch.
Release cable from retainers.
Unclip cable (1) from holder.
Release screw (2) and remove holder (3).
Release aluminium screw on right next to cable retaining plate with special tool 00 9 010 00 9 010 Torx E18 Socket.
Installation Note:
Aluminium screws must be replaced.
Tightening torque 23 00 2AZ [1][2]23 00 Transmission in General 6 Speed.
Disconnect connector (1).
Release screws.
Unscrew holder (2).
Tightening torque 23 00 1AZ [1][2]23 00 Transmission in General 6 Speed.
Supporting transmission:
Support transmission with special tools 23 4 050 23 4 050 Universal Transmission Bracket, 00 2 030 00 2 030 Universal Hydro-Lifter Basic Unit.
Secure transmission to mounting with tensioning strap (1).
Tasks are described in Transmission bracket 23 .. ... Universal BMW Transmission Take-Up.
After completion of work, check transmission oil level.
- Remove propeller shaft from transmission.
- Release centre bearing.
- Tie propeller shaft to one side.
Tasks are described in Removing propeller shaft 26 11 000 Removing and Installing Complete Propeller Shaft (Flexible Disc at Rear).
Note:
When removing and installing the transmission, support the front end of the engine at the housing with an installation aid (e.g. transmission lifter).
Note:
N53 only
Remove cable from holders (1).
Remove screws and nuts.
Remove cross-member.
Tightening torque 23 71 1AZ/ 2AZ 23 71 Transmission Mounts
Lift off retainer (1).
Disconnect shift rod (2).
Installation Note:
Grease shift rod.
Grease,
Refer to BMW Service Operating Fluids.
Make sure shims (3) are in correct position.
Unlock bearing pin (1) in direction of arrow and remove.
Lift out shift arm (1).
Installation Note:
Grease bearing pins (1).
Grease,
Refer to BMW Service Operating Fluids.
Note:
Pressure line of clutch slave cylinder remains connected.
Important!
Slowly relieve tension on clutch slave cylinder otherwise air is drawn in through sealing sleeve.
Release nuts and remove clutch slave cylinder.
Tightening torque 21 52 5AZ [1][2]Clutch Hydraulic System.
Release screws.
Installation Note:
Observe screw fastening sequence without fail.
Tightening torque, steel screws 23 00 1AZ [1][2]23 00 Transmission in General 6 Speed.
Aluminium screws must be replaced.
Tightening torque and angle of rotation
Aluminium screws/bolts 23 00 2AZ [1][2]23 00 Transmission in General 6 Speed.
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.
Installation Note:
Tighten down screws/bolts to specified torque.
Secure angle of rotation special tool 00 9 120 with magnet 00 9 130 to floor plate.
Screw down aluminium screws/bolts further according to angle of rotation.
Angle of rotation 23 00 2AZ [1][2]23 00 Transmission in General 6 Speed.
Installation Note:
Check dowel sleeves (1 and 2) for correct seating.
Replace damaged dowel sleeves.
Ensure correct position of cover plate.
Installation Note:
Check lubrication of transmission input shaft for sticky consistency. If grease is sticky, clean input shaft and replace clutch plate Service and Repair.
Check clutch plate for friction rust in splines and replace Service and Repair if necessary.
Mechanically remove existing grease and lining abrasion from splines of clutch plate (with a cloth).
Installation Note:
Greasing specification:
- Remove and clean release bearing and release lever Service and Repair.
- Push on grease scraper ring 21 2 221 as far as it will go.
- Grease teeth (1) of input shaft. Refer to BMW Service Operating Fluids.
- Detach grease scraper ring.