F 150 2WD Pickup V8-4.6L CNG SOHC VIN 9 (1997)
Wheels: Initial Inspection and Diagnostic Overview
Vibration, roughness, tramp, shimmy and thump may be caused by excessive tire or wheel runout, worn or cupped tires, or wheel and tire imbalance.
These conditions may also be caused by rough or undulating road surfaces. Driving the vehicle on different types of road surfaces will indicate if the
road surfaces are actually causing the condition.
1. Inspect for signs of uneven wear which may indicate a need for balancing, rotation, front suspension alignment, damaged tie-rod, or steering idler
arm
2. Check tires for:
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Cuts.
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Stone bruises.
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Abrasions.
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Blisters.
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Embedded objects.
3. More frequent inspections are recommended when rapid or extreme temperature changes occur, or where road surfaces are rough or occasionally
littered with debris.
4. Tread wear indicators are molded into the bottom of the tread grooves. Replace tire when indicator bands become visible.
Do not immediately suspect the tires when attempting to diagnose a vibration concern. Other sources of vibration include:
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Loose or worn wheel bearings.
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Loose or worn suspension or steering components.
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Brake hub and rotor or drum runout.
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Loose engine or transmission supports.
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Engine driven accessories.
