31 11 506 Lowering/Raising Front Axle Support

31 11 506 Lowering/Raising Front Axle Support

Special tools required:







WARNING:
Danger of injury.
Failure to comply with the following instructions may result in the vehicle slipping off the lifting platform and critically injuring other persons.
When supporting components, make sure that:
- the vehicle can no longer be raised or lowered
- the vehicle does not lift off the locating plates on the vehicle hoist.







IMPORTANT:
Before lowering/removing front axle support:
Observe safety information for raising the vehicle

In order to avoid damage to vehicle hoist, perform weight compensation on vehicle.
Load spring strut domes with sand bags.







WARNING: Secure engine in installation position with special tool to prevent it from falling down.







Necessary preliminary tasks:
- Secure engine in installation position.
- Remove front assembly underside protection.
- If necessary remove pedestrian protection.
- Remove V-strut at front axle support.
- Remove steering shaft from steering gear.
- Undo coolant pipe at the front axle support.
- Disconnect plug connection at the right ride height sensor.







Undo screw (1) for diagonal struts.
Tightening torque 51 71 27AZ.







Release cable clip (1) on steering gear.
Unlock plug connections (2) and disconnect.

Installation note:
Check plug connections for moisture and corrosion.
Make sure wiring harnesses are laid correctly.
Plug connections must audibly snap into place.







Cut open cable tie (1) for steering connecting line on front axle support.
Reroute connecting line to the engine support.

Installation note:
Replace defective cable strap.







Engage special tool 31 5 251 with a 2nd person helping completely on workshop jack 00 2 030.
Insert special tools31 5 253 in telescopic supports of a profile rail pair.
Insert special tools 31 5 256 in telescopic supports of other profile rail pair.

NOTE: In a profile rail pair, two profile rails are connected to one another by gearing.







The jacking points on the left side are shown.

Align special tools 31 5 253 and 31 5 256 to front axle support.
Support front axle support by operating workshop jack 00 2 030.

IMPORTANT: The centre of gravity of the front axle must lie in the middle above the workshop jack.







Release bolts (1-3).
Tightening torque 31 10 1AZ.

Installation note:
Check threads for damage; if necessary, repair with Helicoil thread inserts.
Make sure screws are installed in correct positions.
- Bolt (1) M12x90
- Screw (2) M 12x125
- Screw (3) M 12x53

Tighten these screws (1) first and subsequently screws (2) and (3).