Tires/Wheels - Smooth Road Vibration/Shake
NO: 22-02-94GROUP: Wheels & Tires
DATE: Feb.18, 1994
SUBJECT:
Smooth Road Vibration/Shake
MODELS:
1992 - 1994 (AS) Town & Country/Caravan/Voyager
DISCUSSION:
A smooth road vibration/shake condition may be observed on smooth roads as:
- Low speed lateral wobble of the body (0-30 MPH)
- Steering wheel/seat/floor pan vibration at high speeds (60+ MPH)
Use the following flow chart for diagnosis and correction:
DYNAMIC CHECK
Test drive the vehicle on a smooth road with all accessories turned off to determine the speed and magnitude of vibration/shake condition.
VISUAL INSPECTION (See illustration)
TIRE/WHEEL/HUB RUNOUT CHECKS
NOTE:
ENSURE THE WHEEL BEARINGS ARE PROPERLY ADJUSTED BEFORE PROCEEDING.
Use a dial indicator to check the radial and lateral tire/wheel runouts on vehicle (refer to Figure 1). Mark the point of maximum radial and lateral runout on the tires/wheels.
SPECIFICATIONS:
Radial runout: 0.030 in. (0.762 mm) or LESS
Lateral runout: 0.030 in. (0.762 mm) or LESS
Mark the tire AND wheel at the point of highest runout. Remove the tire from the wheel and check the wheel runouts (check BOTH sides of the wheel at the bead seats (refer to Figure 2) with wheel mounted on an off car balancer.
SPECIFICATIONS:
Radial runout: 0.030 in. (0.762 mm) or LESS
Lateral runout: 0.030 in. (0.762 mm) or LESS
NOTE:
HUB MEASUREMENTS APPLY TO FRONT HUBS ONLY ON FRONT WHEEL DRIVE (FWD) VEHICLES AND TO FRONT AND REAR HUBS ON ALL WHEEL DRIVE (AWD) VEHICLES.
Measure hub wheel pilot diameter (refer to Figure 4).
POLICY: Information Only