BASELINE 225 - Manual (Page 21)

Important: Always read and follow instructions. • 17
Diagnostic Procedures
After Balance Vibration Problems
If vibration is still present after balancing the wheels
and driving the vehicle on smooth pavement, remove
the wheels and recheck the balance. If a wheel is out
of balance the cause may be:
• Wheel was not mounted/centered correctly on the
balancer.
• A weight has come off the wheel (possibly the
wrong clip style). Remove the other weights from
the wheel and rebalance.
• Foreign material inside the tire. Remove the tire
from the wheel, remove the foreign material, and
remount. Remove wheel weights and rebalance the
wheel.
• Stones or other foreign objects caught in the tire
tread or rim. Remove the objects. Check and rebal-
ance if needed.
If the balancer still indicates the wheels are balanced
to within 0.10 ounces on both inner and outer displays,
the problem is not in the balance of the wheels. Check
the following possible sources of vibration:
• Tire pressure. Bring all tires up to the recommended
PSI.
• Radial or lateral runout in the tire or wheel. Replace
the damaged part.
• Unbalance in wheel covers or trim rings. Remove
the wheel covers or trim rings and test drive. If
the vibration is gone, remove the shaft and use
an appropriate adapter to mount the wheel to the
balancer. Balance the wheel with the wheel cover
or trim ring attached to the wheel.
• Incorrectly mounted tire and wheel. Remount cor-
rectly.
• Damaged wheel bolt holes. Replace wheel.
• Worn universal joints. Replace as required.
• Drive shaft unbalance or damaged. Balance, repair,
or replace.
• Unbalance in brake rotor(s) or drum(s).
• Suspension out of alignment. Align the vehicle and
replace any damaged or worn parts.
Balancing Accessory Availability Status
This check permits you to make sure that wear has not
altered the mechanical specifications of flanges, cones
and so on beyond the specified limits.
The test is carried out with a perfectly balanced wheel
(to zero without the threshold and showing the first
gram). When this wheel is mounted on the balancer,
removed and remounted in a different position the
unbalance weight shown should not be more than 10
grams.
If the unbalance is higher, check all the accessories
with care and replace any that show dents, abnormal
wear, bent flanges and so on.
Always remember that if you are using a cone to
center the wheel on the shaft, you will never get good
results if the centre hole in the rim is not perfect, i.e. off
center or out-of-round. Results are always better when
the wheel is centered with the rim holes.
A last important point: any difference between the
way the wheel is mounted on the car and on the balanc-
ing machine will generate some unbalance.