23 00 017 Removing And Installing Transmission (GS6-17BZ) N51/N52/N52K/N53

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Special tools required:

00 2 030 . See 00 2 030 UNIVERSAL HYDRO-LIFTER BASIC UNIT .
00 9 120 . See 00 9 130 MAGNET WITH 1/2" CONNECTION .
00 9 130 . See 00 9 130 MAGNET WITH 1/2" CONNECTION .
21 2 220 . See 21 2 220 GREASE SCRAPER RING .
23 4 050 . See 23 4 050 UNIVERSAL TRANSMISSION BRACKET .

IMPORTANT: After completion of 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 transmission.

IMPORTANT: Aluminum-magnesium materials . No steel screws/bolts may be used due to the threat of electrochemical corrosion. A magnesium crankcase requires aluminum screws/bolts exclusively. 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) .

Necessary preliminary tasks:

Disconnect battery . See 12 00... INSTRUCTIONS FOR DISCONNECTING AND CONNECTING BATTERY .
Remove underbody protection
Remove complete exhaust system . See EXHAUST SYSTEM COMPLETE (N51) or 18 00 020 REMOVING AND INSTALLING COMPLETE EXHAUST SYSTEM (N52, N52K) .
Remove heat shields
Support engine

Release screws (1).

Remove exhaust system bracket (2).

Tightening torque, see 23 00 1AZ in 23 00 TRANSMISSION IN GENERAL .

Fig 1: Identifying Exhaust System Bracket

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Remove holder (1).

Fig 2: Identifying Holder

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Disconnect connector (1).

Release screws (2).

Remove bracket (3).

Tightening torque, see 23 00 1AZ in 23 00 TRANSMISSION IN GENERAL .

Illustration similar

Fig 3: Identifying Connector, Bracket And Screws

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Unclip cable (1) from holder.

Release screw (2) and remove holder (3).

Fig 4: Identifying Holder, Cable And Cable

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Detach plug (1) from reverse gear switch.

Detach cables from fixtures on transmission.

Fig 5: Identifying Reverse Gear Switch Plug

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Supporting transmission:

Support transmission with special tools 23 4 050 , 00 2 030 . See Fig 6.

Secure transmission to mounting with tensioning strap (1).

Tasks are described in Transmission bracket . See 23... Universal BMW Transmission Take-Up .

After completion of work, check transmission oil level.

Fig 6: Identifying Special Tools (23 4 050 And 00 2 030)

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Remove screws and nuts.

Remove crossmember (1).

Tightening torque, see 23 71 1AZ/2AZ in 23 71 TRANSMISSION MOUNTS .

Fig 7: Locating Cross-Member Screws And Nuts

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Remove propeller shaft from transmission.
Release center bearing.
Tie propeller shaft to one side.

Tasks are described in Removing propeller shaft . See 26 11 000 REMOVING AND INSTALLING PROPELLER SHAFT (CARDAN UNIVERSAL JOINT) COMPLETELY .

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 sleeve.

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

Tightening torque, see 21 52 5AZ in 21 52 CLUTCH OPERATION (HYDRAULIC) .

Fig 8: Identifying Clutch Slave Cylinder Nuts

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Detach locking clip.

Fig 9: Removing Locking Clip

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IMPORTANT: New retaining clips fitted as from 04.08.
Retaining clip must interlock captively with retaining web (1) behind shift rod pin.

Fig 10: Identifying Retaining Web

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

IMPORTANT: Grease shift rod pin (3).

Fig 11: Pulling Shift Rod Out Of Shift Rod Joint

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

Fig 12: Identifying Bearing Pin

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Lift out shift arm (1).

Installation:

Grease bearing pin.

Fig 13: Lifting Out Shift Arm

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Release screws.

Installation:

Tightening torque, steel screws. See 23 00 1AZ in 23 00 TRANSMISSION IN GENERAL .

Aluminum screws must be replaced.

Tightening torque and angle of rotation

Aluminum screws/bolts, see 23 00 2AZ in 23 00 TRANSMISSION IN GENERAL .

IMPORTANT: Do not suspend the transmission from the transmission input shaft during removal and installation as this will deform the clutch plate. Pull out transmission towards rear and remove.

Fig 14: Locating Screws

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Installation:

Tighten down screws/bolts to specified torque.

Secure special tool and angle of rotation 00 9 120 with magnet 00 9 130 to floor plate. See Fig 15.

Screw down aluminum screws/bolts further according to angle of rotation.

Angle of rotation, see 23 00 2AZ in 23 00 TRANSMISSION IN GENERAL .

Fig 15: Identifying Special Tools (00 9 130 And 00 9 120)

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Installation:

Check dowel sleeves (1 and 2) for correct seating.

Replace damaged sleeves.

Ensure correct position of cover plate.

Fig 16: Identifying Dowel Sleeves

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Installation:

Check lubrication of transmission input shaft for sticky consistency. If grease is sticky, clean input shaft and replace clutch plate.

Check clutch plate for friction rust in splines and replace if necessary . See 21 21 500 REMOVING AND INSTALLING OR REPLACING CLUTCH (SAC 228) .

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

Fig 17: Checking Input Shaft Grease Splines

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Installation:

Greasing specification:

Remove and clean release bearing and release lever (do not grease).
Push on grease scraper ring 21 2 221 as far as it will go.
Grease splines (1) of input shaft with a brush.
Detach grease scraper ring.

Fig 18: Identifying Grease Splines Of Input Shaft
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