Wheel alignment[/align]Sequence of wheel alignment operations[/align]
Notes:

β—†Wheel alignment is only to be performed at vehicle kerb weight
=> Page 44-14. [/ul]
Exception: Toe-in curve adjustment as per alignment program instructions

β—†Establish which running gear version is fitted in vehicle. Appropriate information is provided on vehicle data sticker => Page 44-14. [/ul]
Always keep to the following sequence:

-Check and if necessary balance out camber at front axle => Page 44-33.
-Check and if necessary adjust camber at rear axle => Page 44-36 (front-wheel drive vehicles).
-Check and if necessary adjust camber at rear axle =>Page 44-37 (four-wheel drive vehicles).
-If necessary, check profile of toe-in curve at front axle.

The tables on Page 44-44 describe the situations where it is necessary to adjust the toe-in curve/toe constant "S". [/ul][/ul]

-Check and if necessary adjust toe at front axle at kerb weight
=> Page 44-46.
6 -If settings have been altered at front axle, perform zero position compensation for steering angle sender -G85. [/ul]
=> Running Gear Self-diagnosis for ABS, ESP; Repair Group 01; ESP, Electronic Stability Program Bosch 5.3; Zero position compensation for steering angle sender -G85

 

Wheel alignment[/align]Vehicle pull and crash vehicles[/align]Vehicle pull
This may be due to rack in steering box not being positioned exactly in the centre when driving in a straight line.
This is enough to result in slight hydraulic steering assistance to left or right and cause vehicle to pull.
Always check centre position of rack when performing wheel alignment on a vehicle subject to "Pulling to one side or at an angle".
Rack in steering box must be positioned exactly in centre when adjusting toe/toe constant.
Crash vehicles
Steering centring must be performed on such vehicles before checking or adjusting toe or toe constant "S".
Checking centre position of rack

β€’Perform steering centring as instructed by wheel alignment computer.
β€’Screw for steering centring V.A.G 1907 must be inserted to centre rack => Page 48-4, Fig.6[/size]7.
β€’Check whether steering wheel is as close as possible to being horizontal on steering column with wheels facing straight ahead.
β€’If necessary, re-position steering wheel accordingly. [/ul]
Otherwise centre position of rack is not guaranteed.
If steering wheel is re-positioned on such vehicles, zero position compensation must be performed for steering angle sender -G85.
=> Running Gear Self-diagnosis for ABS, ESP; Repair Group 01; ESP, Electronic Stability Program Bosch 5.3; Zero position compensation for steering angle sender -G85

 

Wheel alignment[/align]Checking and if necessary balancing out camber at front axle[/align]
Camber cannot be adjusted.
It can be evenly balanced out within the specified/tolerance range by moving the subframe.










β€’Remove noise insulation.
β€’β†’ Slacken off hexagon bolts -1-, -2-, -3-, -4-, -5-, -6-, -7- and -8-. [/ul]










β€’β†’ Use plastic-coated tyre iron to move subframe to appropriate position. [/ul]
Apply pressure in centre of subframe between subframe and longitudinal member of body.
If no plastic-coated tyre iron is available, wrap adhesive tape around a conventional tyre iron.
Attention:
Take care not to damage any components.[/align]Wheel alignment specifications => Page 44-18










β€’β†’ Screw in new hexagon bolts -7- and -8-, tighten to 110 Nm and give further 90Β° turn.
β€’Screw in new hexagon bolts -5- and -6-, tighten to 110 Nm and give further 90Β° turn.
β€’Screw in new hexagon bolts -1-, -2-, -3- and -4- and tighten to 75 Nm.
β€’Install noise insulation. [/ul]
=> General Body Repairs, Exterior; Repair Group 50; Front Body; Noise insulation - Exploded view
Note:
All wheel alignment settings must be checked each time camber is corrected.

 

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[IMG]local://upfiles/12092/37DC516E4DF54DFA8899181843B29E3F.jpg[/IMG]

 

Wheel alignment[/align]Checking rear axle camber (front-wheel drive vehicles)[/align]
Wheel alignment specifications => Page 44-18
On front-wheel drive vehicles, camber can be checked but not adjusted.
If measured values are outside permitted tolerance, check axle beam for damage and replace if necessary.

 

Wheel alignment[/align]Adjusting rear axle camber (four-wheel drive vehicles)[/align]
Wheel alignment specifications => Page 44-20

β€’Unfasten hexagon nut -1-. [/ul]
Note:

β—†Maximum adjustment range is 90Β° to left or right from centre position. [/ul]










β€’β†’ Adjust camber by turning eccentric bolt.
β€’Tighten nut, re-check camber value and correct if necessary. [/ul]

[IMG]local://upfiles/12092/4E6AED87E8D64D8882229B16191F3792.jpg[/IMG]

 

Wheel alignment[/align]Balancing out rear axle toe (front-wheel drive vehicles)[/align]
Overall rear axle toe value cannot be adjusted.
The individual toe values can be balanced out by moving the rear axle.

β€’Slacken off bolts at mounting brackets.
β€’Balance out individual toe values by moving axle beam in elongated holes of mounting brackets. [/ul]
If overall toe value is outside permitted tolerance or if individual toe values cannot be balanced out, axle beam must be checked for damage and replaced if necessary.
If applicable, body is also to be checked in area of rear axle mounting points/aligned and serviced.
=> Body Repairs Workshop Manual

 

Wheel alignment[/align]Adjusting rear axle toe (four-wheel drive vehicles)[/align]
Wheel alignment specifications => Page 44-20

β€’Unfasten hexagon nut -1-. [/ul]
Notes:

β—†Maximum adjustment range is 90Β° to left or right from centre position.
β—†Altering individual toe values automatically changes geometric drive axis as well. [/ul]










β€’β†’ Adjust individual toe values accordingly by turning eccentric bolt.
β€’Tighten nut, re-check camber value and correct if necessary. [/ul]

 

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[IMG]local://upfiles/12092/4E0521461124424CAB82FFC483843207.jpg[/IMG]

 

Wheel alignment[/align]Adjusting front axle toe-in curve[/align]
Explanatory notes:
Bump or rebound alters the toe as a function of the bump and rebound travel. The resultant toe values are referred to as the toe-in curve.
The change in toe constant "S" is set with the vehicle raised by way of vertical adjustment of the track rod end, Page => 44-44.
The wheel alignment computer determines the toe constant "S" by way of one measured value in the initial position and one when raised. In doing so, the actual values are compared to the specifications and displayed on the monitor.
Different adapters are required for raising depending on running gear => Page 44-29.
Note:
Incorrect adjustment of the toe constant will result in inaccurate steering on braking/accelerating or driving over an uneven surface.