When in four wheel drive front end screams "at times sounds like race is spinning on bearings" when shift out of four wheel but hubs are still locked in 4x4 front end still makes loud sound. Found this problem when in Mtns and had to run 4x4 to get out nothing got hot or even warm. What is the solution to this problem?
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What Is a Wheel Bearing?
What Is a Wheel Bearing?
A wheel bearing is a set of steel balls held together by a metal ring called a race. They help wheels spin fast with as little friction as possible. They are used on all kinds of vehicles, from bicycles to aircraft and cars. On a car, a wheel bearing rides on a metal axle shaft and fits tightly inside the hub, which is a hollow chunk of metal at the center of the wheel. The hub holds the lug bolts that you use to bolt the tire onto the wheel. The wheel bearing is pressed into the hub from the back
What Does a Bad Wheel Bearing Sound Like?
When bearings are damaged and making noise, it's hard to diagnose because you have to drive the vehicle in order to reproduce the sound. Here are tips to help you find the source of the problem: When the seal on the wheel bearing is broken or damaged, the noise starts out very faint and becomes louder over time. It sounds like the noise that your tires make when hitting a rumble strip on the highway, just not quite as loud, something like the sound of playing cards flapping against bicycle spokes
While driving down the road about 40 mph, sway the car side to side slowly, shifting the weight of the vehicle from one side to the other. Do not drive crazy or cause the car to spin out, just sway it gently. Notice whether the noise gets louder or softer. If the noise is a little less if you turn right, the damaged bearing may be on the left, or vice versa.
Note that tires that are "chopped" or "scalloped" (worn in patches) also make a rhythmic noise that increases in speed. This sounds very similar to a bad wheel bearing. Look at your tires as well if you hear this kind of noise.
Why Do Wheel Bearings Make Noise?
Most wheel bearings are hardened steel and can withstand a lot of abuse. Its two worst enemies are heat and water. Heat caused by lack of lubrication can destroy a wheel bearing. Water that penetrates a sealed bearing will also destroy it.
Most wheel bearings manufactured today are sealed. They come from the factory pressed together as an assembly: front race, bearing set, center race, bearing set, and outer race, with seals on both the front and rear. Seals protect bearings from the elements, water, and debris, and they also seal in the high-temperature grease the bearing needs. When a seal is broken or damaged, the wheel bearing will fail and start making noise.
the Source of Bearing Noise
, if you really want to know whether your noise is a bearing noise and you can get the car up on a lift, you can use an improvised stethoscope (actually a big screwdriver) to listen to the sound and find out where it's coming from. Have someone in the vehicle start it and run it at about 40 mph. Using a long screwdriver or stethoscope, rest it on the hub near each wheel bearing. Careful! Don't let the tool touch a moving part, or it could fly up and hit you. Listen through the handle of the screwdriver (or through the stethoscope) for the noise, and I guarantee you will be able to determine which bearing is bad
Replacing Your Wheel Bearing
Wheel bearings do not fail immediately, and usually give you some time before you need to have them replaced. I suppose if a wheel bearing failed completely it could lock up and prevent the car from moving. Then again, my daughter drove on a noisy bearing for six months and nothing happened except that it got louder and louder.
You shouldn't necessarily have the bearings on both sides replaced. Just because one fails is no reason to think the others are about to; bearings should last a long time.
Replacing one is a bit expensive because of the labor involved. There are a lot of parts to remove and get out of the way before you can get to the wheel bearing,
Not good! there is a sensor in your transfer case that senses that you are now in four wheel drive if your transfer case does not lock in it will set a code and the light will flash and default back to two wheel drive. check the fluid level in the transfer case and front differential for a sign of internal failure. that is causing the grinding sound.
when you have a rear end without posi track or limited slip, they call this an open differential only one wheel has power at a time. The wheel that spin's the easiest is the one that spins it is cheaper for the manufactor to make but it also has the advantage of better gas mileage sense it is only sending power to one wheel at a time vs two. Tthe disadvantage is when you are stuck in the mud or snow. Remember the wheel that is easier to spin is the one that the engine is sending power to. So you can have one wheel in the mud and one wheel on dry concrete and you are stuck. Now if you are eatting up the same back tire all the time it makes me think that for some reason that the other wheel has something binding it making it harder to turn. It could be a stuck brake, a wheel bearing or in the differential itself. I would start by jacking up the back of the truck so that both tires are off the ground. Now spin each wheel, did you hear any grinding, is one wheel harder to turn than the other? If not quit doing all those big burnouts lol and everything is probably normal. If not and one wheel is harder to turn take the wheel off and the brake drum and see how hard it is to turn, how do the brakes look have they been dragging? If its not the brakes then it might be a wheel bearing and you have to take the rear cover off the diff and pull the pin remove the c clip and slide the axle out and check the bearing. Pull the axle out just enough to clear the diff and spin it does it spin freely or does it bind. If it still hard to turn then replace the wheel bearing. go to the parts store and borrow a sllid hammer it has two jaws that go in and behind the bearing and then slid the hammer until you drive out the bearing. hope this helps
Wheel bearings is my guess. Confirm this by jacking the vehicle up with wheels on and check for play. Grab the tire by the top and bottom and wiggle it in and out, the will be excessive play. Given the fact that you gave a clear explination i am almost certain its bearings. You will need to purchace new bearings(Inner and Outer), Hub Seals, and possibly a possibly an axle seal kit for the 4x4 drive axle (they get old and stick to the axle durring disassembly) and keep in mind that to get the outter races of both bearings in the hub need to be "Pressed" out a a machine shop, or by any shop that might have a press.
You say the rear wheel axles and bearings have been replaced, you mention nothing of the front wheels, you have the symptoms of a front wheel bearing being worn out, remove them and check for pitting in the bearing rollers or the bearing races, I am sure you will find a problem. Hope this helps solve your issue with the bearing noise.