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July 16, 2012
 
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IN THIS ISSUE
• High-end fixes
• New ProDemand site
• On-car lathe

 
 
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Symptoms of a worn hub bearing
Signs of a worn wheel hub bearing vary in severity. Some may be difficult to detect, leading to damage before corrective action can be taken. The time frame in which damage occurs is linked to driving conditions and/or the mechanical practices that were followed at installation. Noise is a classic sign of a bad wheel bearing or wheel hub bearing. Here are some indicators of a worn wheel hub bearing or other wheel-end damage. More...
» MORE ON: Timken


In the Shop

For Your Techs: Naked axles
 What you need to pass along in your shop
G. Jerry Truglia, contributing editor
Every vehicle has quirks about it. Some just have more than others. Check out these stories about higher-end vehicles, a BMW and a Jaguar to be specific, and the lengths these techs went to for a proper, accurate diagnosis. More...
» MORE ON: Scope & Scan


Mitchell 1 launches new ProDemand site
 Mitchell 1 has launched an informative new website for its ProDemand™ repair information software at www.ProsDemandIt.com. The site features information about the next generation of software from Mitchell 1 that will change the way that automotive technicians service vehicles. More...
» MORE ON: ProDemand

On-car lathe
Hunter's new QuickComp lathe improves on previous designs with a faster and easier setup to enhance overall service. The QuickComp lathe features a two-way adjustable compensation adaptor that works with Hunter's patented Pro-Comp® computerized compensation to adjust for lateral runout of the hub in seconds. More...
» MORE ON: Tools


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ASE Question of the
Month

This week we would like to know...

Let's revisit one of our June features on an electrical testing technique called voltage drop. Measuring voltage drop is a dynamic test performed on a live circuit and is an excellent way to find the cause of unwanted resistance that static ohm measurements might miss.

Technician A is performing a voltage drop test on a horn circuit. He's placed his negative voltmeter lead on the negative battery post, and his positive voltmeter lead is placed on the ground terminal of the horn connection right at the back of the horn assembly. With the horn pad depressed and the horn circuit activated, he measures 12.40 volts at the ground-side connector. This tells Technician A that the:

  1. The power side of the circuit is open.
  2. The ground-side of the circuit is open.
  3. The horn has an internal open.
  4. The horn is working properly.
Test your ASE knowledge and then enter our contest sponsored by Federated Auto Parts for a chance to win prizes each month for just answering the question.


Click here to vote

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