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Ford: Smoke From Vehicle When Starting

Vehicle: 2005 Ford Taurus SE, 3.0L Complaint: The customer says smoke comes from vehicle when starting. Cause: Confirmed the customer’s complaint and found smoke coming from the vehicle when the engine was started. Inspected the vehicle and found...

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R-1234yf Safety Procedure Checklist

Remember that R-1234yf is only mildly flammable. To become flammable, the mixture of air and refrigerant in a closed area like a vehicle cabin would need to be between 6.5% and 12.3% of the chemical vapor. This mixture must then experience a significant...

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Refrigerant Revolution: What R-1234yf Means for Service, Equipment, Safety

The new R-1234yf refrigerant is more than just a new jumble of numbers and letters on a label. For your shop, R-1234yf means several new procedures, a certification and new equipment in order to properly handle these new systems. Why the difference...

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Ford Fusion Alignment Spec (2005-‘13)

Millions of Ford ­Fusions were sold in the U.S. between 2005 and 2013. When it comes to alignments, it is critical to diagnose the customer first, to find out if their Fusion drifts or pulls, and then to check all of the possibilities for the complaint...

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Nissan Titan Brake Job

The Titan is Nissan’s full-size pickup. The Titan has had no major brake problems or recalls, and the brakes are fairly easy to service. Nissan had a few teething problems with brake judder on 2004-‘06 models, but this was corrected with better...

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The Case for On-Car Wheel Balancing and Wheel-to-Hub Indexing

Off-car wheel balancers do an excellent job of measuring dynamic unbalance — static and couple — and many also measure tire/wheel uniformity, radial runout or calculate radial force variation (RFV) to help eliminate vibration and verify the assembly...

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Engine Coolant Temperature Diagnostics

While old-school cooling system service often ­focused on coolant leaks and overheating engines, let’s begin thinking “new-school” by looking at modern cooling systems through the eyes of the engine coolant temperature (ECT) sensor. Coolant temperature...

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Volkswagen: Parking Indicator Sounds Off with No Obstacle

Customer complains that the parking assistance issues warning sounds for both the front and/or rear of vehicle with no obstacle in range. Water intrusion into sensor holders is causing corroded plug contacts and sensor electrical pins, which results in...

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Volkswagen: Unnecessary Electric Coolant Fan Replacements

Model: 2006 Volkswagen Jetta Sedan Customer concerns of “electric coolant fans continue to run after the ignition is switched off” are resulting in unnecessary coolant fan replacements. It is considered normal operation for the electric coolant...

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Educating Drivers, Technicians and Service Advisers with Dill’s New TPMS Videos

Dill Air Controls has launched its new TPMS training and educational videos, supporting three audiences — consumers, technicians and service advisers. The consumer videos are available in shortened versions, and are positioned for the customer waiting...

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Top 5 Tools: Kenny Younkins, Ken’s Auto Service Center

Kenny Younkins, owner Ken’s Auto Service Center Akron, OH While Ken first said his favorite tool is his fishing rod, he said in the shop he prefers these five:   Snap-on 3/8” Drive Impact Wrench Mastercool Brake Flaring Kit Mitchell...

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Mitchell 1 Enhances Quick Links and Printing Functions in Latest Release of ProDemand

Mitchell 1 announces it has made several important enhancements in the latest release of its ProDemand repair, diagnostic and maintenance information program as a direct response to customer feedback. The implemented changes include an expanded Quick...

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By Larry Carley
Technical Editor

The classic symptom of a wheel bearing that is failing is cyclic noise. Most often a bad bearing will produce a chirping sound or a growl that changes in proportion to vehicle speed.

If a bad bearing is suspected, the wheel bearings should be inspected to see if there is any play. On late-model vehicles with sealed wheel bearings or bearing cartridges, there should usually be little or no play.

To check a wheel bearing, grasp the tire at the 12 and 6 o’clock positions and attempt to rock the tire. If any play can be felt, the bearings are loose and need to be replaced.

Also, rotate the tire by hand. Any roughness or noise from the bearings would also tell you the bearings are worn or damaged and need to be replaced.

Bearing play can be measured by placing a dial indicator against the hub and turning the wheel. Refer to the vehicle manufacturers specifications, but as a rule no more than .005 inches of play is allowed for most sealed wheel bearing and hub assemblies.

If one wheel bearing is loose or noisy, pay close attention to all of the other hubs on the vehicle, too, especially if the vehicle has a lot of miles on it or has been driven through axle deep water or been flooded. Chances are some of the other wheel bearings may also need to be replaced.

Customers should be warned not to put off replacing a noisy or loose wheel bearing. A bearing failure can often cause the wheel (or rear axle in the case of a rear axle bearing) to separate from the vehicle. This would cause a loss of steering control that might have potentially deadly consequences!

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Ford: Smoke From Vehicle When Starting

Vehicle: 2005 Ford Taurus SE, 3.0L Complaint: The customer says smoke comes from vehicle when starting. Cause: Confirmed the customer’s complaint and found smoke coming from the vehicle when the...More

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