23 00 017 Removing and installing transmission (GS6-17BG) N51/N52/N52K

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Special tools required:

00 2 030
00 9 120
00 9 130
21 2 221
23 0 112
23 0 131
23 0 132
23 0 134

IMPORTANT: After completion of work, check transmission oil level.

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.

The end faces of these screws/bolts are painted blue for the purposes of reliable identification.

Jointing torque and angle of rotation must be observed without fail (risk of damage ).

Necessary preliminary tasks:

Disconnect battery
Remove underbody protection
Remove complete Exhaust System
Remove heat shields

Release screws (1).

Remove exhaust system bracket (2).

For tightening torque refer to 23 00 1AZ in 00 COMPLETE TRANSMISSION .

Fig 1: Exhaust System Bracket And Screws

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Remove holder (1).

Fig 2: Holder

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Disconnect connector (1).

Unfasten screws (2).

Remove bracket (3).

For tightening torque refer to 23 00 1AZ in 00 COMPLETE TRANSMISSION .

Fig 3: Bracket, Mounting Screws And Connector

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Unclip cable (1) from holder.

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

Fig 4: Cable And Screw

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Detach plug (1) from reverse gear switch.

Detach cables from fixtures on transmission.

Fig 5: Reverse Gear Switch Plug

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Supporting transmission:

Support transmission with special tools 23 0 050, 23 0 132 and 00 2 030.

Tasks are described in Transmission bracket.

Fig 6: Special Tools (23 4 050), (23 0 132) And (00 2 030)

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Remove screws and nuts.

Remove cross-member (1).

For tightening torque refer to 23 71 1AZ/2AZ in 23 71 TRANSMISSION MOUNTS .

Fig 7: Cross-Member, Mounting 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 .

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).

For tightening torque refer to 21 52 5AZ in 21 52 CLUTCH OPERATION (HYDRAULIC) .

Fig 8: Clutch Slave Cylinder And Nuts

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Detach locking clip.

Fig 9: Locking Clip Removal Direction

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

Installation:

Grease shift rod pin (3).

Grease,

Refer to BMW Service Operating Fluids.

Fig 10: Shift Rod, Joint, Pin And Removal Direction

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

Fig 11: Bearing Pin And Unlocking Direction

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Lift out shift arm (1).

Installation:

Grease bearing pin.

Grease,

Refer to BMW Service Operating Fluids.

Fig 12: Shift Arm And Removal Direction

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Unfasten screws.

Installation:

For tightening torque of steel screws refer to 23 00 1AZ in 00 COMPLETE TRANSMISSION .

Aluminium screws/bolts must be replaced.

For tightening torque and angle of rotation refer to

Aluminium screws/bolts 23 00 2AZ in 00 COMPLETE TRANSMISSION .

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 13: Transmission Retaining 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.

Continue to screw down blue aluminium screws/bolts in accordance with angle of rotation.

For angle of rotation refer to 23 00 2AZ in 00 COMPLETE TRANSMISSION .

Fig 14: Special Tools (00 9 120) 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 15: Transmission 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.

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

Fig 16: Transmission Input Shaft

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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.
Refer to BMW Service Operating Fluids.
Detach grease scraper ring.

Fig 17: Transmission Input Shaft Splines, Scraper Ring, Special Tools (21 2 240) And (21 2 221)
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