23 00 017 Removing and installing transmission (GS6-17BG) N20

WARNING: This page is about a different variant/trim than selected.

Special tools required:

IMPORTANT: To prevent heavy damage to the engine block, the protruding thread of the transmission bolts absolutely must be checked for damage and corrosion before removal .
If there are signs of corrosion, the rust must be removed and the threads must be cleaned before removal .
Replace rusted, damaged screws.

Failure to comply with this instruction will result in serious damage to the engine block and transmission.

IMPORTANT: After completion of repair work, check TRANSMISSION OIL LEVEL .
Use only the approved GEARBOX OIL .

Failure to comply with this requirement will result in serious damage to the manual gearbox.

Necessary preliminary tasks:

Remove UNDERBODY PROTECTION .
Remove complete EXHAUST SYSTEM .
Remove heat shields.
Partially remove PROPELLER SHAFT .
- Disconnect propeller shaft at transmission.
- Release center mount.
- Tie up propeller shaft to underbody.
NOTE: Bending the propeller shaft by an excessive angle can cause premature damage to the joint/propeller shaft!
Support engine with lifter when removing transmission.

Unscrew nuts (1).

Remove heat shield (2).

Fig 1: Identifying Heat Shield Nuts

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Slacken nut (1).

Remove retaining plate (2).

Fig 2: Identifying Retaining Plate Nut

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Unscrew nuts (2).

Tightening torque 18 20 1AZ .

Release screws (1).

Tightening torque 23 00 1AZ .

Fig 3: Identifying Transmission Nuts And Screws

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Release screws (1).

Tightening torque 23 00 2AZ .

Remove cover plate (2).

Fig 4: Removing Cover Plate

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Detach connector (1) from reverse gear switch.

Detach cables from brackets on transmission.

Fig 5: Locating Plug Connector On Reverse Gear Switch

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Disconnect plug connection (1) on zero gear sensor.

Fig 6: Identifying Plug Connection On Zero Gear Sensor

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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 cup.

Fig 7: Locating Clutch Slave Cylinder Nuts And Holder

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Unfasten screws (2).

Remove clutch slave cylinder (1).

Tightening torque 21 52 5AZ .

Detach retaining clip.

Fig 8: Removing Retaining Clip

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IMPORTANT: Retaining clip must interlock captively with retaining web (1) behind gearshift rod pin.

Fig 9: Identifying Retaining Web

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

Installation note:

Grease gearshift rod pin (3).

Grease, refer to OPERATING FLUIDS .

Fig 10: Pulling Gearshift Rod From Gearshift Rod Joint

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

Fig 11: Removing Bearing Journal

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Lift out gearshift arm (1).

Installation note:

Grease bearing journal.

Grease, refer to OPERATING FLUIDS .

Fig 12: Lifting Out Gearshift Arm

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Supporting transmission:

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

Secure transmission to mounting with tensioning strap (1).

Tasks are described in GEARBOX HOLDER .

After completion of work, check transmission fluid level.

Fig 13: Supporting Transmission With Special Tools (23 4 050) And (00 2 030)

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Release screws (3).

Tightening torque 22 32 4AZ .

Fig 14: Identifying Transmission Screws

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Release screws.

Tightening torque 23 00 1AZ .

Pull transmission downwards and remove.

IMPORTANT: Do not allow transmission to hang on transmission input shaft when removing and installing, as the clutch disc will be deformed.

Fig 15: Locating Transmission Input Shaft Screws

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Installation note:

Check fitting sleeves (1 and 2) for correct fit.

Replace damaged sleeves.

Ensure correct position of cover plate.

Fig 16: Identifying Fitting Sleeves

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Installation note:

Check lubrication of transmission input shaft for sticky consistency. If grease is sticky, clean transmission input shaft and REPLACE CLUTCH DISC .

Check clutch disc for frictional corrosion in the gearing and REPLACE IF NECESSARY .

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

Fig 17: Locating Transmission Input Shaft Lubricating Area

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Installation note:

Greasing specification:

Remove and clean release bearing and release lever (do not grease).
Push on grease scraper ring 21 2 220 until limit position.
Grease gearing (1) of input shaft with a brush (grease: refer to OPERATING FLUIDS ).
Detach grease scraper ring.

Fig 18: Identifying Input Shaft Grease Gearing

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