III. Runout Measuring Procedure

Maximum Runout guidelines





NOTE:
Please use the runout guidelines (see illustration) only when the runout specification from the service manual is not available.

Measurement Procedure:

1. Warm up the tires prior to taking measurements to eliminate slight flat spotting. This may be done during a road test. Newly installed tires usually do not require warm up.

2. Raise the vehicle on a lift so that all four positions can be measured. If measurements are to be taken off the vehicle, mount each assembly on a dynamic balance machine.

3. Mark a stud bolt for future reference when reinstalling the original assembly position on hub. Also, mark the vehicle position on each tire/wheel assembly.

4. Place the runout gauge in position to take either the radial or lateral measurement. Rotate the assembly (or wheel) to find the low spot. Adjust the gauge to read zero. Rotate the assembly once to ensure that the low spot has been located and that the dial returns to zero.

5. Rotate the assembly slowly but constantly and note the amount of runout variance from zero on the dial of the gauge. Locate and mark the high spot.

If there is a large difference in runout measurements from on-vehicle to off-vehicle, the runout variation is due to either a vehicle condition (for example, bolt circle or hub runout) or the fit between the vehicle and the wheel.

If measured runouts are not within the specifications or guidelines, perform the match mounting procedure.