Skylark V6-3100 3.1L VIN M SFI (1996)
onto the subject vehicle.
-
After match mounting, the tire/wheel assembly must be rebalanced.
If match mounting tires to in-spec wheels produces assembly values higher than these, tire replacement may be necessary. Replacing tires at lower values
will probably mean good tires are being condemned. Because tires can sometimes become temporarily flat-spotted, which will affect force variation, it is
important that the vehicle be driven at least 16 km (10 mi) prior to measuring. Tire pressure must also be adjusted to the usage pressure on the vehicle's
tire placard prior to measuring.
Most GM vehicles will tolerate radial force variation up to these levels. However, some vehicles are more sensitive, and may require lower levels. Also,
there are other tire parameters that equipment such as the Hunter GSP9700 cannot measure that may be a factor. In such cases, TAC should be contacted
for further instructions.
Important
-
When mounting a GM wheel to a wheel balancer/force variation machine, always use the wheel's center pilot hole. This is the primary
centering mechanism on all GM wheels; the bolt holes are secondary. Usually a back cone method to the machine should be used. For
added accuracy and repeatability, a flange plate should be used to clamp the wheel onto the cone and machine. This system is offered by
all balancer manufacturers in GM's dealer program.
-
Any type of service equipment that removes tread rubber by grinding, buffing or truing is NOT recommended, and may void the tire
warranty. However, tires may have been ground by the tire company as part of their tire manufacturing process. This is a legitimate
procedure.
Steering Wheel Shake Worksheet
When diagnosing vibration concerns, use the following worksheet in conjunction with the appropriate Vibration Analysis-Road testing procedure in the
Vibration Correction sub-section in SI.
