23 00 019 Removing and installing transmission (GS6-37BZ) N51/N52/N52K/N53

WARNING: This page does not describe the selected car, but rather 11 other vehicles, including the 2008 BMW 328xi, 2008 BMW 328i, 2008 BMW 323i, 2007 BMW 328xi, and 2007 BMW 328i. However, it is still accessible from the selected car via links, so may be relevant.

Special tools required:

00 2 030
00 9 010
00 9 120
00 9 130
21 2 221
23 0 132
23 4 050

IMPORTANT: After completion of work, check Gear 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 aluminum screws/bolts exclusively.

Aluminum 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:

Remove underbody protection at front and rear with brackets.
Remove Front Underbody Protection .
Remove Rear Underbody Protection (with brackets).
Remove Complete Exhaust System
Remove heat shields
Support engine with lifter when removing transmission

Release screws (1).

Remove exhaust system bracket (2).

For tightening torque refer to 23 71 4AZ in 23 71 TRANSMISSION MOUNTS .

NOTE: Illustration similar

Fig 1: Identifying Exhaust Bracket And Mounting Screws

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Detach plug (1) from reversing light switch.

Release cable from retainers.

Fig 2: Identifying Plug From Reversing Light Switch

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Disconnect connector (1).

Unfasten screws.

Unscrew holder (2).

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

Fig 3: Disconnecting Connector Holder And Screw

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Supporting transmission:

Support transmission with special tools 23 4 050, 23 0 132 and 00 2 030.

Secure transmission with tensioning strap (1).

Tasks are described in Transmission Bracket .

After completion of work, check transmission oil level.

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

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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: 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).

Fig 5: Identifying Transmission Cable Holders

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Remove screws and nuts.

Remove cross-member.

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

Fig 6: Locating Cross-Member Screw And Nuts

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Lever out retainer (1).

Disengage shift rod (2).

Installation:

Grease shift rod.

Grease,

Refer to BMW Service Operating Fluids .

Make sure shims (3) are in correct position.

Fig 7: Identifying Clutch Shift Rod, Lever And Shims

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Release and remove bearing pins (1) in direction of arrow.

Fig 8: Removing Bearing Pins

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Lift out shift arm (1).

Installation:

Grease bearing pins (1).

Grease,

Refer to BMW Service Operating Fluids .

Fig 9: Lifting Shift Arm

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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.

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

Fig 10: Identifying Clutch Slave Cylinder Pressure Line And Retaining Nut

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Release screws.

Installation:

Observe screw fastening sequence without fail.

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

Aluminum screws/bolts must be replaced.

For tightening torque and angle of rotation for

Aluminum screws/bolts 23 00 2AZ refer to COMPLETE TRANSMISSION .

Fig 11: Transmission Housing Bolts Tightening/Loosening Sequence

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IMPORTANT: Do not allow the transmission to hang off from the transmission input shaft as this will deform the clutch plate. Pull out transmission towards rear and remove.

Installation:

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 blue aluminum screws/bolts in accordance with angle of rotation.

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

Fig 12: Securing Special Tool (00 9 120) And (00 9 130) To Floor Plate

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Installation:

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

Replace damaged dowel sleeves.

Ensure correct position of cover plate.

Fig 13: 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.

Mechanically remove existing grease and lining abrasion from splines of clutch plate (with a cloth).

Fig 14: Identifying Transmission Input Shaft

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Installation:

Greasing specification:

Remove and clean Release Bearing And Release Lever .
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.

Fig 15: Identifying Transmission Input Shaft Teeth And Special Tools (21 2 240)/(21 2 221)
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