Vanden Plas L6-4.0L (1990)
Tires: Customer Interest
Tires - Vibrations, Flat Spotting
04-15
Tires and Wheels - Tires "Flat Spotting" JAGUAR Wheel Balance Procedure
SERVICE MODEL: All
DATE: 8/94
ISSUE:
Symptoms of road wheel and vehicle vibration caused by tire "flat spotting" may be confused with vibration symptoms caused by out of balance
tire/wheel assemblies.
Tire flat spots develop when the vehicle is at rest They are characteristic of high performance tires an4 develop more rapidly when the tires are hot
Tire "Flat Spotting" Symptoms:
^
A shaking motion of the vehicle at 30 MPH
^
Road wheel vibration at 60-64 MPH - Front tire "flat spotting"
^
Road wheel vibration at 68-72 MPH - Rear tire "flat spotting"
ACTION:
If customers complain of vehicle or road wheel vibration, perform the following procedure to determine if the symptoms are caused by tire "flat spotting"
or out of balance tire/wheel assemblies.
Diagnostic Procedure:
1.
Set cold tire pressure to "comfort settings".
2.
Drive the vehicle for 10 to 15 miles.
3.
If the vibration symptoms are caused by "flat spotting", the vibration will decrease as the tires "run off" the "flat spotting". In extreme cases it may
take 15 to 20 miles to "run off" the flat spots. No repair is necessary for "flat spotting". Advise the customer that the condition is a characteristic of
high performance tires.
4.
If the vibration symptoms do not diminish, the tire/wheel assemblies should be balanced.
IMPORTANT:
If the tire/wheel assemblies are out of balance after the road test immediately raise the vehicle on a lift until its tires are off the ground. This will
avoid the risk of the tires developing flat spots before balance is checked.
Tire/Wheel Balance Procedure:
1.
Set cold tire pressure to "comfort settings".
2.
Mount the tire and wheel assembly on the wheel balancer. Ensure the correct adapters are used and the assembly is mounted correctly on the
balancer.
3.
Check the tire and wheel assembly balance.
4.
If the assembly is out of balance, remove all existing balance weights and clips and recheck balance.
NOTE:
