Terraza FWD V6-3.5L VIN 8 (2005)
Wheel Bearing: All Technical Service Bulletins
Wheels/Tires/Drivetrain - Vibration at 45-75 MPH
Bulletin No.: 06-03-06-001
Date: March 09, 2006
INFORMATION
Subject:
Diagnostic Tips for Vibration/Shake Felt In Steering Wheel/Column Area, Drivers Seat, Rear Floor Area While Driving at Highway Speeds of 72
km/h-120 km/h (45 mph-75 mph)
Models:
2005-2006 Buick Terraza
with Independent Rear Suspension (IRS) (RPOs FE4 and FE5)
This bulletin will address three POSSIBLE factors that may influence a smooth road vibration/shake experienced in the Terraza van with independent
rear suspension. These are not the only three possibilities that may cause a vehicle vibration/shake. This bulletin is designed to be a diagnostic aid and
NOT a specific repair guideline.
The vibration that may be felt in the steering wheel/column, driver's seat and/or in the rear floor pan may come from a combination of suspension and I/P
fasteners, tires that exhibit high radial force variation and/or rear wheel bearings that have high lateral runout.
Tire and Wheel Assemblies
Inspect the tire and wheel assemblies for excessive radial force variation as outlined in Service Bulletin # 00-03-10-006A (or newer) - Information on
Tire Radial
Force Variation (RFV).
It is critical that when working on the Terraza van with independent rear suspension that the two tire/wheel assemblies with the least amount of radial
force variation be installed on the rear of the vehicle to minimize a vibration/shake condition.
Rear Bearing Hub Assembly Inspection
It is possible that a rear bearing hub assembly may have excessive lateral runout, end play, or wheel stud runout that can cause a vibration/shake
condition on smooth road surface. Follow the procedure below to check lateral runout in the rear bearing hub assemblies.
Wheel Bearings Diagnosis
1.
Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.
2.
Remove the tire and wheel. Refer to Tire and Wheel Removal and Installation in Tires and Wheels.
Important:
Support the vehicle by the lower control arms to prevent movement during wheel bearing/hub inspection.
3.
Mount and secure the J-8001 Dial Indicator to the steering knuckle.
4.
Firmly push the hub flange towards the vehicle.
5.
Ensure that the dial indicator contacts the vertical surface of the hub as close as possible to the center of the flange.
6.
Firmly pull the hub flange away from the vehicle in order to inspect the total travel indicator by the dial indicator.
7.
The rear wheel bearing lateral runout should be less than 0.127 mm (0.005 in).
Brake Rotor Assembled Lateral Runout (LRO) Measurement
Important:
^
Brake rotor assembled lateral runout (LRO) exceeding the maximum allowable specification can cause thickness variation to develop in
the brake rotor over time, usually between 4 800-11 300 km (3,000-7,000 mi).
^
Brake rotor thickness variation MUST be checked BEFORE checking for assembled LRO. Thickness variation exceeding the maximum
