23 00 028 Removing and installing transmission (GS6-45BZ) N55
Special tools required:
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.
Use only the approved transmission oil.
Failure to comply with this requirement will result in serious damage to the manual gearbox.
As of production date 09/2012, only steel bolts are installed for the securing of the transmission.
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) .
The aluminum bolts can be optionally replaced by steel bolts.
Necessary preliminary tasks:
- Remove underbody protection at front and rear . See REMOVING AND INSTALLING/REPLACING FRONT UNDERBODY PROTECTION or REMOVING AND INSTALLING/REPLACING REAR 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 jack when removing gearbox
Unscrew nuts (1).
Release holder (2) and ground strap (3) from vehicle underbody.
Nut (ground strap on body) tightening torque 23 11 8AZ .
Release screws (1).
Remove strut (2).
- Similar to graphic.
Release aluminum screws (1) on transmission.
Tightening torque 23 00 1AZ .
Unscrew nuts (2).
Tightening torque 18 20 1AZ .
Remove bracket (3).
Installation note:
Renew aluminum screws (1).
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 .
Unscrew nut (1) and bolts (2).
Remove gearbox cross member (3).
Tightening torque 22 32 3/4AZ .
Illustration: Automatic
Release nuts and remove clutch slave cylinder.
Tightening torque 21 52 1AZ .
Lift off retainer (2).
Detach gearshift rod (1).
Installation note:
Grease gearshift rod.
Grease, refer to MANUAL TRANSMISSION -- OPERATING FLUIDS .
Unlock bearing journal (1) in direction of arrow and remove.
Lift out gearshift arm.
Installation note:
Grease bearing journals (1).
Grease, refer to MANUAL TRANSMISSION -- OPERATING FLUIDS .
Disconnect plug connection (1) on reverse gear switch.
Release line from holder.
- Similar to graphic.
Disconnect plug connection (1) on zero gear sensor.
Release all lines from holder.
Release screws.
In vehicles with an N54/N55 engine from production date 09/2012, only steel bolts are installed.
Steel screws (1, 2, 4, 5, 6, 9), tightening torque 23 00 1AZ .
Release aluminum screws with special tool 00 9 010.
Aluminum screws (3, 6, 7, 8), tightening torque 23 00 1AZ .
Renew aluminum screws (3, 6, 7, 8).
Installation note:
Check that fitting sleeves are correctly fitted.
Replace damaged fitting sleeves.
Installation note:
Check lubrication of transmission input shaft for sticky consistency. If grease is sticky, clean input shaft and REPLACE CLUTCH DISC .
Check clutch disc for frictional corrosion in gearing and replace IF NECESSARY .
Remove any grease and lining abrasion from gearing of clutch disc by mechanical means (with a cloth).
Installation note:
Greasing specification:
- Remove and clean RELEASE BEARING AND RELEASE LEVER .
- Push on grease scraper ring 21 2 240 to the limit position.
- Grease gearing (1) of input shaft with a brush.
Grease, refer to MANUAL TRANSMISSION -- OPERATING FLUIDS .
- Detach grease scraper ring.
Installation note:
Tighten down screws/bolts to specified torque.
Special angle-of-rotation tool 00 9 120 with magnet 00 9 130.
Secure to vehicle underbody and screw down aluminum screws/bolts in accordance with angle of rotation.
Angle of rotation 23 00 1AZ .