3G- 56 1973 OPEL SERVICE MANUAL
parking brake cable. Spin the other wheel using the
same procedure.
By spinning the wheels, the offending tire will cause
vibration that may be felt by touching the bumper or
fender. By the process of elimination, proceed on
STATIC UNBALANCE
DYNAMIC UNBALANCE
‘\I....;,’
30-i
Figure 3G-2 Static and Dynamic Unbalance
tires that cause vibration as follows:
Unbalance
Check for tire/wheel unbalance An unbalanced
wheel assembly that is causing a vibration can, in
most cases, be reduced to an acceptable level by
static and dynamic wheel and hub balancing. Correct
by rebalancing, Figure
3G-2.
It is recommended that
an on-the-car balancer be used for balancing.
A tire/wheel assembly that is in balance may still be
causing a vibration when the car is driven, but may
not set up a vibration when the wheel is off the
ground and submitted to the spinner test. In such
cases, the next step is to check radial and lateral
runout.
Runout
A runout gauge should be used to determine the
amount of total radial and lateral runout at the tire
that causes the vibration. See Figures
3G-3
and
3G-4.
A guide to runout maximum totals is as follows:
,035
inch Radial
-
Wheel
,050
inch Radial
-
Tire/Wheel Assembly
,045
inch Lateral
-
Wheel
<UPPORT
I
Figure 3G-3 Checking Radial
Runout
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