Wheel, Balancing On Stationary Balancing Machine
Before beginning balancing, the following requirements must be fulfilled.
- The tire pressure must be OK.
- The tire profile must not be worn on one side. The tire profile must be at least 4 mm.
- The tires must not have any damage such as cuts, holes, foreign bodies, etc.
- The suspension and steering, including the shock absorber, must be in perfect condition.
- Test drive performed. Refer to VIBRATION, ROAD TEST, PERFORMING BEFORE BALANCING .
If equipped handle the glued-on wheel trim carefully. Surface slightly scratched.
Replace the damaged rim wheel trim.
Only use the Wheel Balancer Clamping Plate: VAS 6652 and Thrust Pin: VAS 6652/1 .
Tension the wheel on balancing machine
Dirt and rust in the area of the contact surfaces and centering of the wheel distort the result.
-- Clean the contact surfaces, centering seat and wheel disc using the Pneumatic Brush Grinder Set: VAS 6446 before tensioning wheel on balancing machine!
The wheel balancing machine must use the correct system for centering and tensioning the tires when replacing them. Reference the information for the Wheel Balancing Machine Centering System before beginning any work.
-- Tension the wheel with the tire on the balancing machine.
To mount the wheel on the wheel balancer, use for example Centering System: VAS 6685 .
This way a 100% centering of the wheel and gentle tensioning is possible!
It is not possible to center it 100% on balancing machine with conical tensioners.
With a deviation of 0.1 mm outside the center, there is an imbalance of 10 grams on the wheel/tire.
Wheel/tire balancing procedure
-- Let the wheel/tire turn on the balancing machine.
-- Check the run of the characteristic curves on the sidewall of the tire in the area of the rim flange.
-- Check the tire wear pattern while the wheel/tire is turning.
In the event of one-sided wear, wear spots from braking or severe flattening, smooth running cannot be achieved by balancing. In this case, the tire must be replaced.
-- Check the run-out on the wheel/tire. If the wheel with tire runs untrue, although there are no flat spots, a radial run-out or lateral run-out may be the cause.
-- Check the wheel with tire for radial and lateral run-out. Refer to WHEELS AND TIRES, RADIAL AND LATERAL RUN OUT, CHECKING WITH TIRE DIAL GAUGE .
-- If the radial and lateral run-out are within the specified tolerance, balance the wheel and tire.
Do not use more than 60 grams of weight per wheel.
If more weight is necessary, a smoother running can achieved by matched mounting of the tire. Matching a tire. Refer to TIRES AND RIMS, MATCHING .
The display in the balancing machine should show 0 grams.
Hunter RFT33VAG Road Force Touch™ Wheel Balancer: VAS 6230B4 can be inserted as an alternative to matching. Refer to VIBRATION, VIBRATION CONTROL SYSTEM .
-- Install the wheel on the vehicle.
Ceramic brake destruction due to removal/installation of the wheel.
- To remove/mount a wheel, install the long drift instead of the wheel bolts at the topmost position (12 o'clock position) and insert the short drift in the wheel bolt mounts for support.
-- Tighten the lowest wheel bolt by hand to approximately 30 Nm.
-- Tighten the remaining wheel bolts diagonally to approximately 30 Nm. This process centers the wheel on the wheel hub.
-- Set the vehicle on its wheels.
-- Use a torque wrench to tighten the wheel bolts diagonally to the specified tightening specification.
-- Perform a road test.
If a vibration is still detected during the road test, the cause may be due to tolerance in the wheel centering.
The component tolerances of wheels and wheel hubs can be additive in unfavorable cases. Vibration can result from this. This can be eliminated using a finish balancer. Refer to WHEEL, BALANCING WITH FINE BALANCING MACHINE (FINISH BALANCER) .