Expedition 2WD V8-5.4L SOHC VIN L (1997)
Wheels: Component Tests and General Diagnostics
Runout
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.
Wheel Centering 0-Ring Seal
The front hub and rear axle wheel pilots are fitted with rubber O-rings which help center the wheels. Remove the O-ring and clean the machined groove
and clean and lubricate the O-ring if required. Replace the O-ring if damaged. O-rings should be pulled on (not pushed) so that the yellow paint
identification stripe is visible after installation.