Front Axle

Removing and installing four-wheel final drive








Preliminary work for four-wheel final drive

1. Remove underbody cover.
2. Remove underbody cover.
3. Remove underbody cover.
4. Remove rear cardan shaft.
5. Support the engine at the body.
6. Remove front axle.

Removing four-wheel final drive

1. Remove running gear brace.





Fastening screws for cross-shaped plate

2. Remove engine mounting.
3. Place collection pan underneath.
4. Detach coolant pipe at turbocharger.





Coolant pipe mounting





Coolant line

5. Remove torque support at bracket.





Torque support at bracket

6. Detach cross shaft engine carrier from engine and pull it out by approx. 20 cm by twisting it.
7. Lower engine at safety device by approx. 15 mm.
8. Remove engine mounting.
9. Remove catalytic converter on the right.
10. Impact puller 9799 must be fitted at the groove in the connecting shaft using 4 screws.





Fitting tool

11. Remove connecting shaft from four-wheel final drive using impact puller 9799. At the same time, the connecting shaft pushes itself into the PDK transmission.





Removing and installing connecting shaft

Information
The fastening screw can only be removed and fitted when the assembly is removed.

Information
* Transmission oil can leak out when removing the four-wheel final drive.

12. Unscrew fastening screws securing final drive to engine and remove final drive.





Mounting, final drive to engine

Installing four-wheel final drive

Information
The fastening screw can only be removed and fitted when the assembly is removed.

Information
* Transmission oil can leak out when removing the four-wheel final drive.

1. Insert fastening screw -1- into transmission.





Mounting, final drive to engine

2. Tighten fastening screws for four-wheel final drive in the prescribed sequence. -> Tightening torque: 54 Nm (40 ftlb.)+6 Nm (+4.5 ftlb.)





Mounting, final drive to engine

3. Install engine mounting.

Information
The fastening screw can only be removed and fitted when the assembly is removed.

4. Insert upper fastening screws at cross shaft engine carrier.
5. Insert cross shaft engine carrier together with shaft into final drive and screw in fastening screws.
6. Fit engine mounting on cross shaft engine carrier.
7. Replace circlip at input flange of four-wheel final drive.





Circlip, four-wheel flange

8. Thinly coat input flange of four-wheel final drive with Anti Seize PAG No:.
9. Impact puller 9799 must be fitted -1- at the groove in the connecting shaft using 4 screws.





Fitting tool

10. Attach connecting shaft on four-wheel final drive and fit using impact puller 9799 until ring -1- on transmission is visible.





Removing and installing connecting shaft





Suspending transmission

11. Remove catalytic converter on the right.
12. Fit torque support at bracket.





Torque support at bracket

13. Tighten coolant pipe at turbocharger.





Coolant pipe mounting





Coolant line

14. Fit running gear brace.





Fastening screws for cross-shaped plate

Subsequent work for four-wheel final drive

1.
2. Install front axle.
3. Remove engine support at body.
4. Install rear cardan shaft.
5. Check oil for four-wheel final drive.
6. Install underbody cover.
7. Install underbody cover.
8. Install underbody cover.