Tires/Wheels - Vibration/Steering Wheel Oscillation

88chrysler08

Models


1985-1988 "NF45Z" (Vista) Four-WheelDrive


Subject

Body Shake and/or Steering Wheel Nibble/Oscillation at 45-65 MPH


Index

TIRES & WHEELS


Date

June 20, 1988


No. P-2441

22-02-88 REVISION A

(C22-03)
This bulletin supersedes Technical Service Bulletin 22-02-88 which should be removed from your files. This bulletin revises Procedure A by adding two additional diagnostic steps, and Procedure C with regard to vehicles equipped with aluminum wheels. This revision also adds a Tire Ordering Information Worksheet to assure all necessary information has been gathered before calling for tire assistance.

SYMPTOM/CONDITION

Vehicle shake and/or steering wheel nibble/oscillation at 45-65 mph. The condition may feel worse when operating the vehicle on very smooth road surfaces.

DIAGNOSIS

Road test the vehicle in the 45-65 mph speed range, preferably on a smooth blacktop road and verify the body shake or steering wheel oscillation.

REPAIR PROCEDURES

It will be necessary to assure that the tires are properly inflated, balanced, and within runout guidelines to correct the condition. In rare instances, it may be necessary to replace the tires.

Procedure A

1. Check tire pressure in each tire and adjust as necessary. Higher than recommended tire pressures promote vehicle shake due to the increase in radial force variation.

2. Check front hub for axial play and rear axle shaft for end play and correct as necessary.

3. Check steering wheel free play and adjust as necessary.
4. Check the tire/wheel assemblies for damaged and/or bent wheels. Replace any damaged tires or wheels. Check tire and wheel run-out and correct as required.

5. Balance the tire and wheel assemblies on a properly calibrated off-car wheel balancer. (Refer to the balance machine instructions for checking machine calibration and wheel balancing procedures.)

Procedure B

If the condition is not corrected using Steps 1 through 5, then it may be necessary to finish-balance the tires and wheels on the vehicle to assure that the total rotating assemblies (tires, wheels, brake drums/rotors, etc.) are in balance.

Procedure C

If the shake or steering wheel oscillation still occurs, it will be necessary to replace the two front tires with new Yokohama "Y382E" tires, product code 382-1870-14 PEWL. These tires can be identified by the "Y382E" molded on the serial number side (inside) of the tire just above the bead seating ring, and are available through Yokohama U.S.A. The toll-free number to obtain these tires is 1-800-722-9888. Fill out the attached information sheet prior to calling so that you have complete information available. (Do not accept tires marked "Y382" when trying to correct this vibration.) The "Y382E" tire exhibits different force variation characteristics, which are required to correct this particular problem.

NOTE: WHEN INSTALLING THE NEW TIRE ON THE WHEEL, MAKE SURE THAT THE WHITE PAINT MARK ON THE WHEEL IS ALIGNED WITH THE RED PAINT MARK ON THE TIRE. THIS WILL PROVIDE FOR A LOW RADIAL FORCE VARIATION TIRE AND WHEEL ASSEMBLY. BALANCE THE ASSEMBLIES ON A PROPERLY CALIBRATED WHEEL BALANCER AND INSTALL THEM ON THE VEHICLE.

If the vehicle is equipped with aluminum wheels, it is not necessary to perform the above step.

Procedure D

If the vehicle shake is still present, it will be necessary to also replace the two rear tires with the "Y382E" tires.

6. Road test the vehicle and assure that the vibration is corrected.

ZONE AUTHORIZATION IS REQUIRED FOR TIRE REPLACEMENT.

NOTE: TIRES WILL BE FURNISHED ON A "NO CHARGE" BASIS BY YOKOHAMA U.S.A.
POLICY: Reimbursable within the provisions of the warranty


TIME ALLOWANCE:
Labor Operation No. 22-65-05-90 . . . . . . . . . . . . . . . . . . . . . . . . . . 1.4 Hrs.
22-65-05-91 . . . . . . . . . . . . . . . . . . . . . . . . . . 2.4 Hrs. 22-65-05-92 . . . . . . . . . . . . . . . . . . . . . . . . . . 3.5 Hrs. 22-65-05-93 . . . . . . . . . . . . . . . . . . . . . . . . . . 4.5 Hrs.


FAILURE CODE: XX - Service Adjustments
YOKOHAMA TIRE ORDERING INFORMATION WORKSHEET


Obtain the following information prior to calling Yokohama U.S.A. The toll-free number is 1-800-722-9888.

DEALER NAME: (Your)


ADDRESS:


CITY, STATE, ZIP:


CUSTOMER NAME:


VIN:


IN-SERVICE DATE:


REPAIR DATE:


MILEAGE:


BRAND OF WHEEL:


ALUMINUM OR STEEL?:


LOT NUMBER OF TIRE:

ZONE OFFICE AUTHORIZATION NO.:


OBTAIN THIS INFORMATION WHEN REQUESTING TIRES FROM YOKOHAMA U.S.A.


DISPOSITION OF TIRES:

PERSON CONTACTED AT YOKOHAMA U.S.A: