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Supporting transmission

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Support transmission with special tools 23-4050 FIXTURE and 00-2030 DEVICE .

Secure transmission to mounting with tensioning strap (1).

Tasks are described in TRANSMISSION BRACKET  .

After completion of work, check transmission oil level. See GEAR OIL LEVEL .

Fig 1: Supporting Transmission Using Special Tools (23 4 050)
G06915374Courtesy of BMW OF NORTH AMERICA, INC.

Release bolts (1) and nuts (2) and remove cross-member.

Tightening torque 23 71 2AZ .

Fig 2: Identifying Cross-Member Bolts And Nuts
G04742197Courtesy of BMW OF NORTH AMERICA, INC.
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, see "5AZ" under 21 52 CLUTCH OPERATION (HYDRAULIC) .

Fig 3: Locating Clutch Slave Cylinder Nuts
G04742198Courtesy of BMW OF NORTH AMERICA, INC.

Lift off retainer (1).

Clamp off shift rod (2).

Installation: 

Grease shift rod.

Grease, refer to CLUTCH COMPONENT GREASE .

Make sure shims (3) are in correct position.

Fig 4: Disconnecting Shift Rod
G04726016Courtesy of BMW OF NORTH AMERICA, INC.

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

Lift out shift arm.

Installation: 

Grease bearing pins (1).

Grease, refer to GEAR SHIFT MECHANISM - OPERATING FLUIDS .

Fig 5: Removing Bearing Pins
G04742200Courtesy of BMW OF NORTH AMERICA, INC.

Unlock plug (1) of zero-gear sensor (ON TRANSMISSION) and disconnect.

Fig 6: Identifying Zero-Gear Sensor Lock Plug
G04742201Courtesy of BMW OF NORTH AMERICA, INC.

Release remaining eight bolts (1/2).

IMPORTANT: Bolts (2) are longer than bolts (1)

Tightening torque 23 00 1AZ .

NOTE: Bolt (3) must not be released.
Bolt (3) serves to secure the starter motor.
Fig 7: Identifying Starter Motor Bolts
G04742202Courtesy of BMW OF NORTH AMERICA, INC.
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.

Installation: 

Check that fitting sleeves (1) are correctly seated.

Replace damaged fitting sleeves.

NOTE: When removing and installing the transmission, without fail use transmission bracket 23-4050 FIXTURE and a jack to support the engine.
Failure to comply with this instruction may result in preliminary damage to the clutch and splined shaft.
Fig 8: Identifying Fitting Sleeves
G04742203Courtesy of BMW OF NORTH AMERICA, INC.

Installation: 

Check lubrication of transmission input shaft for sticky consistency. If grease is sticky, clean input shaft and replace clutch plate. See 21 21 500 REMOVING AND INSTALLING/REPLACING CLUTCH (GS6-53BZ) S85 USA ONLY .

Check clutch plate for friction rust in splines and replace if necessary. See 21 21 500 REMOVING AND INSTALLING/REPLACING CLUTCH (GS6-53BZ) S85 USA ONLY .

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

Fig 9: Locating Transmission Input Shaft Lubrication
G04755545Courtesy of BMW OF NORTH AMERICA, INC.

Installation: 

Greasing specification:

Fig 10: Locating Grease Scraper Ring And Splines
G04726011Courtesy of BMW OF NORTH AMERICA, INC.