23 00 018 Removing And Installing Transmission (GS6-53BZ) N54

WARNING: This page is about a different car, the 2010 BMW 135i, 2009 BMW 135i, and 2008 BMW 135i. 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 2 240
23 4 050

IMPORTANT: After completion of work, check gear oil level. See 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: 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 DISCONNECTING AND CONNECTING BATTERY .
Remove front underbody protection. See REMOVING AND INSTALLING/REPLACING FRONT UNDERBODY PROTECTION .
Remove rear underbody protection. See REMOVING AND INSTALLING/REPLACING REAR UNDERBODY PROTECTION .
Remove complete exhaust system. See REMOVING AND INSTALLING COMPLETE EXHAUST SYSTEM (N54) .
Remove heat shields
Support engine with lifter when removing transmission

Remove brackets (1-3).

Fig 1: Identifying Brackets

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Release screws (1).

Disconnect connector (2).

Steel screws, tightening torque 23 00 1AZ .

Aluminum screws, tightening torque 23 00 2AZ .

Release aluminum screws with special tool 00 9 010 .

Fig 2: Identifying Screws And Connector

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Release screws (1).

Remove holder (2).

Fig 3: Identifying Screws And Holder

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Unlock plug (1) from reversing light switch and detach.

Release cable from retainers.

Fig 4: Identifying Plug On Reversing Light Switch

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Release screws (1).

Remove exhaust system bracket (2).

Tightening torque 23 71 4AZ .

NOTE: Illustration similar

Fig 5: Identifying Exhaust System Bracket With Mounting Screws

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Supporting transmission:

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

Secure transmission to mounting with tensioning strap (1).

Tasks are described in Transmission bracket. See UNIVERSAL BMW TRANSMISSION TAKE-UP .

After completion of work, check gear oil level. See DRAINING/TOPPING UP GEAR OIL IN MANUAL TRANSMISSION .

Fig 6: Supporting Transmission Using Special Tools 23 4 050 And 00 2 030

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Release bolts (1) and nuts (2) and remove crossmember.

Tightening torque 23 71 2AZ .

Fig 7: Identifying Crossmember Bolts 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 REMOVING AND INSTALLING PROPELLER SHAFT (INSERTED) COMPLETELY .

IMPORTANT: Do not allow propeller shaft to hang from fixed ball joint (risk of damage) .

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 and remove clutch slave cylinder.

Tightening torque 21 52 5AZ .

Fig 8: Locating Clutch Slave Cylinder Nuts

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Lever out retainer (1).

Disengage shift rod (2).

Installation:

Grease shift rod.

Make sure shims (3) are in correct position.

Fig 9: Removing Retainer

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

Lift out shift arm.

Installation:

Grease bearing pins (1).

Fig 10: Removing Bearing Pin

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Release screws.

Steel screws, tightening torque 23 00 1AZ .

Aluminum screws/bolts (3, 4, 5, 9, 10), tightening torque 23 00 2AZ .

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 11: Transmission Housing Bolts Tightening/Loosening Sequence

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Installation:

Tighten down screws/bolts to specified torque.

Secure special angle-of-rotation tool 00 9 120 with magnet 00 9 130. See Fig 12.

Fig 12: Securing Special Angle-Of-Rotation Tool 00 9 120 With Magnet 00 9 130

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Secure to floor plate and screw down aluminum screws/bolts in accordance with angle of rotation.

Angle of rotation specification: see Fig 13.

Fig 13: 23 00 2AZ Tightening Torque And Angle Of Rotation

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Installation:

Check that dowel sleeves are correctly seated.

Replace damaged dowel sleeves.

Ensure correct position of cover plate.

Fig 14: 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. See REMOVING AND INSTALLING/REPLACING CLUTCH (SAC 240) .

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 15: Locating Transmission Input Shaft

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Installation:

Greasing specification:

Remove and clean release bearing and release lever. See REMOVING AND INSTALLING/REPLACING CLUTCH (SAC 240) .
Push on grease scraper ring 21 2 240 as far as it will go. See Fig 16.
Grease splines (1) of input shaft with a brush.
Detach grease scraper ring.

Fig 16: Identifying Grease Scraper Ring 21 2 240 And Splines
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