Sonata V6-3.0L (1991)
Technical Service Bulletin # 9350015
Date: 931001
Wheels/Tires - Vibration Diagnosis & Repair
Group: CHASSIS
Number: 93-50-015
Date: OCTOBER, 1993
Model: ALL
Subject:
DIAGNOSIS AND REPAIR OF WHEEL AND TIRE VIBRATION
Purpose
The purpose of this bulletin is to diagnose vibrations caused by wheel and tire assemblies and correct them by following a logical, systematic procedure.
NOTE:
By either eliminating or pinpointing a specific possible cause, the condition may be isolated and corrected at an early stage and subsequent steps can
be eliminated. Do not align a vehicle to address a vibration concern. Vibrations can not be improved or eliminated by wheel alignment changes.
Vibration Analysis
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Vibrations that are tire or wheel induced may be caused by two factors: balance or runout.
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Low-speed vibrations, those which occur at less than 40 mph, are usually related to runout. Highway speed vibrations, those which occur at greater
than 40 mph, may be caused by either imbalance or runout.
The procedure outlined here matches with the Vibration Diagnosis flow chart. When you become familiar with this procedure, it will be possible to go
directly to the flow chart to systematically diagnose and correct a tire/wheel induced vibration.
(1)
VISUAL CHECKS
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Ensure that tires on the same axle match in size and type.
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Proper inflation pressure.
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Proper tire bead seating on rim.
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Irregular or excessive tire wear.
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Damaged wheel or tire.
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After market wheel nuts and anti-theft lock.
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Loose or missing wheel weights.
(2)
Complaint definition:
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Identify the type of vibration by discussing with the customer in what speed range the vibration occurs; and whether it was apparent when
the vehicle was new or whether the condition gradually or suddenly appeared.
(3)
Road test the vehicle to verify the customer complaint. Please use procedure I, if necessary.
(4)
Tire runout check, on-car:
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Check wheel/tire assembly radial and lateral runouts on the car per the procedure III.
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If runout is excessive (not ok) - Perform an off the car runout check, step (5).
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If the runout check is ok - Go to off the car dynamic balance, step (9).
(5)
Tire runout check, off-car:
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Check wheel/tire assembly radial and lateral runouts off the car per procedure III.
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If runout is excessive (not ok) - perform the tire to wheel match mounting procedure, step (6).
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If the runout check is ok - Go to step (7).
(6)
Tire to wheel match mounting:
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Match mount tire to wheel per procedure IV.
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If the runout is reduced to be within acceptable guidelines, then - Go to step (9).
^
If the runout is not reduced to be within acceptable guidelines, replace tire and/or wheel as necessary. Then - Go to step
(7)
Index assembly on wheel studs:
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Index the tire/wheel assembly on the wheel studs until the runouts are minimized.
^
If the runouts are ok - Go to step (9).
