Detailed Test D

D1 CHECK FOR FRONT WHEEL BEARING ROUGHNESS
1. Raise and support the front end of the vehicle so that the front wheel and tire assemblies can spin.
  See LIFT AND SUPPORT POINTS .
2. Spin the front tires by hand.
  - Do the wheel bearings feel rough?
YES

Inspect the wheel bearings. Repair as necessary. Test the system for normal operation.

NO

Go to D2.
D2 CHECK THE END PLAY OF THE FRONT WHEEL BEARINGS
Check the end play of the front wheel bearings.
- Is the end play OK?
YES

Go to D3.

NO

Adjust or Repair as necessary. Test the system for normal operation.
D3 MEASURE THE LATERAL RUNOUT AND THE RADIAL RUNOUT OF THE FRONT WHEELS ON THE VEHICLE
Measure the lateral runout and the radial runout of the front wheels on the vehicle. Go to DETAILED TEST C .
- Are the measurements within specifications?
YES

Go to D4.

NO

Install new wheels as necessary and Balance the assembly. Test the system for normal operation.
D4 MEASURE THE LATERAL RUNOUT OF THE FRONT TIRES ON THE VEHICLE
Measure the lateral runout of the front tires on the vehicle. Go to DETAILED TEST C .
- Is the runout within specifications?
YES

Go to D5.

NO

Install new tires as necessary and Balance the assembly. Test the system for normal operation.
D5 MEASURE THE RADIAL RUNOUT OF THE FRONT TIRES ON THE VEHICLE
Measure the radial runout of the front tires on the vehicle. Go to DETAILED TEST C .
- Is the runout within specifications?
YES

Balance the front wheel and tire assemblies. If any tire cannot be balanced, Install a new tire. Test the system for normal operation.

NO

Go to D6.
D6 MATCH MOUNT THE TIRE AND WHEEL ASSEMBLY
Mark the high runout location on the tire and also on the wheel. Break the assembly down and rotate the tire 180 degrees (halfway around) on the wheel. Inflate the tire and measure the radial runout.
- Is the runout within specifications?
YES

Balance the assembly. Test the system for normal operation.

NO

If the high spot is not within 101.6 mm (4 inches) of the first high spot on the tire, Go to D7.
D7 MEASURE THE WHEEL FLANGE RUNOUT
Dismount the tire and mount the wheel on a wheel balancer. Measure the runout on both wheel flanges. Go to DETAILED TEST C
- Is the runout within specifications?
YES

Locate and Mark the low spot on the wheel. Install the tire, matching the high spot on the tire with the low spot on the wheel. Balance the assembly. Test the system for normal operation. If the condition persists, Go to D8.

NO

Install a new wheel. Check the runout on the new wheel. If the new wheel is within limits, locate and Mark the low spot. Install the tire, matching the high spot on the tire with the low spot on the wheel. Balance the assembly. Test the system for normal operation. If the condition persists, Go to D8.
D8 CHECK FOR VIBRATION FROM THE FRONT OF THE VEHICLE
Spin the front wheel and tire assemblies with a wheel balancer while the vehicle is raised on a hoist. Feel for vibration in the front fender or while seated in the vehicle.
- Is the vibration present?
YES

Substitute known good wheel and tire assemblies as necessary.

Test the system for normal operation.

NO

Check the driveline components. Test the system for normal operation.