Component Tests and General Diagnostics

TEST DESCRIPTION
Excessive radial and lateral runout of a wheel and tire assembly can cause roughness, vibration, wheel tramp, tire wear, and steering wheel tremor.

Before checking runout and to avoid false readings caused by temporary flat spots in the tires, check runout only after the vehicle has been driven far enough to warm tires.

The extent of the runout is measured with Radial Runout Gauge. All measurements are made on the vehicle with the tires inflated to recommended inflation pressures and with the front wheel bearings adjusted to specifications.





TIRE RUNOUT
Use Radial Runout Gauge to measure (A) radial runout of the tire at the center and outside ribs of the tread face. Mark the high points of radial runout for future reference. Radial runout should not exceed specifications.

WHEEL RUNOUT
Measure (B) radial and (C) lateral wheel runout at the positions shown in the illustration. Runout should not exceed specifications.