Vibration Control System Vas 6230; Finish Balancer - Volkswagen 2004 Golf Workshop Manual

If you detect vibration during the road test, it may be due to tol‐
erance in the wheel centring.
In unfavourable circumstances, the component tolerances of
wheels and hubs could cumulate. This too can lead to vibration.
This can be alleviated using a finish balancer.
12.5 Vibration control system -VAS 6230-
Using the vibration control system -VAS 6230- you can perform
more functions than just stationary balancing.
A special feature of this system is the testing of the radial force of
the wheel and tyre while rolling.
A roller presses against the wheel with a force of about 635 kg.
This simulates the vertical tyre force against the road surface
during travel.
Radial and lateral runout in the wheel and tyre and differences in
the stiffness of the tyre cause the vertical force of the wheel to
vary.
The -VAS 6230- detects and stores the position of the maximum
measured radial force in the tyre. Then the position of the smallest
distance between the wheel rim flange and the centre of the rim
is measured.
12.6

Finish balancer

Note
Before working with a finish balancer , the mechanic needs to
♦
have been instructed by the manufacturer of the balancer.
To balance the wheels, set the wheels of the driven axle on
♦
the sensor platforms (only the front wheels of a front-wheel
drive vehicle, all four wheels of a four-wheel drive vehicle).
If you determine a residual imbalance greater than 20 grams
when balancing the wheels, you should rotate the mounting po‐
sition of the wheel on the hub.
– Mark the point at which the imbalance is indicated.
– Unbolt the wheel and rotate its position on the hub so that the
marking points downwards.
Note
The hub must not rotate during this procedure.
– First hand-tighten the lowest wheel bolt to about 30 Nm.
– Then tighten the remaining wheel bolts diagonally to about
30 Nm. This process ensures that the wheel is centred prop‐
erly on the hub.
– Check whether the imbalance is less than 20 grams using the
finish balancer.
Golf 2004 ➤ , Golf Plus 2005 ➤
Running gear, axles, steering - Edition 08.2009
⇒ page 327
12. Rough running due to wheels/tyres - causes and rectification
327