16 Wheel Bearings found ; Chevrolet Malibu Front Wheel Bearing · 13526966. $79.64 MSRP: $158.02 ; Chevrolet Malibu Wheel Hub Kit, Front · 88957259. $119.12 MSRP: $ ...

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Optimizing lubrication of plant machinery with ultrasound will result in a significant reduction in grease consumption. Having an ultrasound programme in place will help create a better culture involving cleaner storage practices, sampling, and avoiding mixing greases.

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The best way to test for a bad bearing is to jack up the wheel from the suspected axle side and do a manual feel test. If the properly mounted wheel can be wiggled up and down and side to side, this is a sure sign the wheel bearing has failed. If the wheel bearing is simply worn, but holding, the wheel should be removed, the brake pads removed, and the axle spun by hand. A good wheel bearing with allow the axle to spin smoothly with some small amount of resistance. If you feel any roughness in the spinning motion, the wheel bearing is probably bad.

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How do we know when just the right amount of grease has been added? By monitoring the friction level with ultrasound as new grease is applied – slowly, one shot at a time.

Ultrasound assisted lubrication of plant assets offers significant benefits that calendar-based lubrication cannot. Lubrication serves a primary purpose, which is to create a thin layer of lubricant between rolling and sliding elements that reduces friction. So it makes sense that the best way to determine the lubrication requirement of a machine is to monitor friction levels – not time in service.

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Like any job there is a right way and a wrong way to do things. Simply listening to a bearing with an ultrasound device that gives no measurement feedback is a recipe for disaster.

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I can confirm for you that a bad CV joint can manifest itself as a 'buzz saw" vibration in the steering wheel. As can other things.

The increased friction and pressure from too much grease raises the temperature inside the bearing. Excess heat could decrease the effectiveness of the lubricant causing the oil to separate from the thickener. Not adding enough grease has the same life-shortening effect.

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Finally, by monitoring the condition of your machinery’s lubrication, you are at the same time collecting valuable condition data about the machine itself. Dynamic and static ultrasound data coupled with condition indicators such as Overall RMS, Max RMS, Peak, and Crest Factor are all indicators of bearing health.

The feelings you describe certainly seems like a wheel bearing. However, worn-out brakes can also cause this feeling. Worn-out brakes typically feel worse when braking-however. If the feeling only seems to get worse when turning, I think you are on the correct track in assuming a bad bearing.

Bearings need grease for one reason only, to reduce friction. As long as the lubricant is performing that service well, there should be no need to change it, or add more. Yet we frequently do, with catastrophic results.

Maximum RMS and Peak dB measurements indicate alarm levels and greasing intervals while Ultrasonic Crest Factor provides insight about the bearing condition in relation to its lubricant. Crest Factor helps us differentiate between bearings that need grease and bearings that need to be replaced.

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The audible feedback alone is too subjective to draw any comparative conclusions. No two people hear the same and there is no way to remember what the bearing sounded like a month ago.

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If part of your job is greasing plant machinery then you know well the battle against frictional forces that threatens the useful life of rolling element bearings. Lubrication of rolling element bearings is one of the most misunderstood and abused tasks in industry. Can it be true that 40 percent of bearings never live to their engineered life cycle and that bad lubrication practices are the leading cause of this mortality?

When the ideal lubrication level is reached, the dB microvolts value returns to its normal level. This is perfectly audible in the headphones, in the reproduction of the dynamic signal and visible on the screen of the SDT device.

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Anytime I suspect a bad wheel bearing I jack up the suspected corner of the car and try to wiggle the wheel while watching for play in the hub area. Just the wheel moving could be a sign of a bad ball joint or tie rod end, but if it’s moving in the hub area it’s the wheel bearing. If you have an infrared thermometer check the temperature of the wheels after driving a few miles. If a wheel bearing is bad usually there will be a significant amount of heat transfer to the wheel. If you check the temperature by hand be careful, I’ve seen wheels get extremely hot from a bad wheel bearing. I actually saw the hub and wheel on my father in laws truck smoking from the heat of bad bearing one time and the lug nuts were so hot I couldn’t touch them.

Yes, that would be the problem. In all likelihood, that joint needs repairing/replacing. Common repairs often fail (seems to be the consensus from this thread), and since you’re now feeling a humming, that implies there’s some damage to the joint itself. Your best bet, at this point, is to replace the axle with a new or rebuilt unit. Again, the consensus here is that rebuilt shafts don’t work all that well, nor last that long.

The third mistake is depending solely on subjective ultrasound noise when precise quantifiable data is available. Therefore always use an ultrasound instrument with digital decibel metering. Better still, use a device that provides multiple condition indicators.

Just to let you know, I’ve worked on cars for over 20 years, and most of the problems I encounter are determined more by feel than by sound. While I can hear problems in cars as they are pulled up, determining the cause of the sound almost always comes down to feeling for the problem. If you are unable to determine the cause of the vibration yourself, please let a mechanic look it over for you. The feeling your describing appears to be coming from the wheel/hub/suspension components none the less, and a failed component in this area is very dangerous and can lead to loss of control.

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Ok now…I jacked up the front of the car and did the “12:00 and 6:00” method. Both wheels are tight and snug. I did the hot wheel temperature and both wheels are cool to the touch. With that, I could have ruled out wheel bearings. Now I decided to take a look under the right front corner. And I found the CV joint boot had thrown grease from the boot all over. I think the CV joint is the culprit. Could a bad CV joint cause all this vibration and humming sound?

Friction is all around us. Without it we would find it very difficult to run, walk, or even stand on our own two feet. We need friction to drive our cars and fly our aeroplanes; and we need friction for our motors to drive pumps. But when it comes to our plant machinery, friction is both friend and foe.

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Having now heard that it’s producing a “roaring” sound, I too think it sounds like a bearing. However, you know you need half-shafts anyway, so I’d do those first and see how it feels.

Another way to check for a worn bearing is with the tire off the ground, place your hand on the strut spring. Now slowly rotate the tire. If the bearing worn, the roughness of the bearing will be transfered into the strut spring where it can be felt.

One is to jack the vehicle up so that tire is off the ground. Grab the tire at the 12:00 and 6:00 oclock positions and try rocking the top and bottom of the tire in and out to check for play in the bearing. If the tire rocks that bearing is worn.

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Can I drive with a bad wheel bearing? ... No, it can be very dangerous. The bearings can cause a severe problem if they malfunction. As we said before, extreme ...

I have a question…I have a '03 Toyota Camry with 4 cyl and auto trans. This has 118k miles. I’m wanting to know what symptoms bad wheel bearings will give. Why? I am Deaf and obviously can’t hear. I know there’s a way to test for bad wheel bearings by wheel but I’m wanting to know if can do it by feeling? Whenever I’m driving between 40-50 mph, I get a very fine humming feel on my steering wheel. I can sense if there is a wheel out of balance but this doesn’t feel like it…my steering wheel feels like a vibrating sander, you know? Just wondering if that means bad wheel bearings or something else? Thanks!

Listen to the bearing and measure the drop in friction as the grease flows in to the bearing. As the decibel level approaches a minimum value and stabilizes pay close attention. Add single shots. Should the decibel level begin to increase slightly, stop! The job is done.

Lubricating a bearing just because your calendar told you “time is up!” is the first mistake. Monitor, measure and trend friction levels with ultrasound to know when it is the right time to grease.

I’m not sure who it was (Caddyman? Keith? Someone else?) who had a link for replacement shafts that aren’t much more than rebuilds, but seem to be much more reliable. Hopefully they’ll pop on soon and post the link for you.

Ok thanks for the diagnosis. Can it be determined how much it would cost to replace wheel bearings in my area (Knoxville, TN)? Should it be inexpensive? Thanks.

A practice that does not use this combination is not a real solution when lubricating bearings. Who knew so much good could come from such a simple shift from calendar to condition based maintenance? Now you know.

Many folks misdaignose problems as tire related when they are actually bearing and CV joint related. I think Busted is right - especially about not waiting to get this looked at.

For what it’s worth, I’ve had bad hearing for decades for a variety of reasons and as a mechanic I’ve had to focus more on attuning myself to the feel of a problem rather than the audible end of things. So yes, you can determine many faults by feel instead of with the ears.

The second mistake we must avoid is adding too much, or not enough grease. Too much grease builds pressure, pushing the rolling elements through the fluid film and against the outer race. The bearing now has to work much harder to push the rolling elements through a mud bog of grease.

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Roaring is usually a sign of a faulty wheel bearing, not a CV joint. If this turns out to be a wheel bearing I would suggest replacing both sides if possible

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Roaring is usually a sign of a bad wheel bearing and as it get worse will usually turn into a popping or grinding noise, at this point they’re usually on their last few miles.

If the right CV joint is bad, I will go ahead and replace the left one too since it probably isn’t far behind. I just would like confirmation that a bad CV joint can cause all this? Thanks for your advice!

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The bottom line is that you’ve searched properly for the source of the vibration, you’ve found that you need new half-shafts, so go ahead and fix that first, then see how it feels.

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Machines that are properly lubricated require less energy to run. Imagine that reducing the amount of money spent on grease will actually lead to lower energy bills. Machines that consume less electricity run cooler and machines that run cooler have longer life cycles.

I asked my younger brother who was in town for business to drive my car tonight to see if it was making any noise. Sure enough it was. My brother said it was roaring loudly from the front end driving from 25 MPH to highway speed. More scary now since I can’t hear that and not know if it will break on me… I think this is more definite confirmation the CV axles are about to disintergate on me so I will have them replaced this week and post back on if it was the culprit.

Failed wheel bearings do indeed make noise, can sound like snow tires at high speed…As Knuckles said, you can jack up the wheels one at a time and FEEL & LOOK for play in the wheels…

Ok, the real reason to optimize bearing lubrication is to extend the life of bearings by making sure they have the right amount of grease, but not too much. When everything is running according to plan, lube-technicians will spend less time greasing bearings that do not need it. So when counting up the benefits of your ultrasound programme does not forget to add “decreased labour” to the long list.

Lubricating a bearing once per week or once per month may seem like a sensible thing to do. After all, performing scheduled maintenance at regular periods is an age-old concept.

Bearings depend on grease to reduce friction levels. By avoiding three common mistakes when greasing bearings you can predict the right time to grease, know how much grease to apply, and be confident in the bearing’s overall health.

Reliability Centered Maintenance (RCM) promises improved reliability, but is it always worth it? Full-scale implementation is often overly complex, costly, and unnecessary—like using a cannon to shoot a mosquito. Without readiness and a strong foundation in basic maintenance practices, RCM can distract from more practical, cost-effective solutions. Simpler, experience-driven approaches may often yield better results.

An abnormality in tire tread wear can also mimic a worn wheel bearing and this is easily checked. I assume this has been done. Another possibility could be a failed motor mount which could set up a quirky vibration. (Check the dog bone mount under the hood on the passenger side top. That’s the most common failure and easily fixed if a problem.)

I’d go ahead and replace the half shaft that has the torn boot. It’s likely the CV joint is damaged from lack of grease and dirt and water getting to it.