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Old 02-26-2019, 11:14 AM   #1
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May have found my bus...but it has a rear end vibration

Hi all, I may have found the perfect bus for me, however there's one issue that the owner mentioned which has me a little concerned: rear end vibration at highway speeds. He didn't think that it was too pronounced, but it seems like there are many possible culprits. The bus hasn't really been driven in about 2 years, stored on a flat lot. It's a couple hours away from me so I won't really get a chance to inspect it anytime soon, but I was curious if there are any real common fixes for this type of problem.

FWIW, it's an early 2000s IC bus.

Thanks!
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Old 02-26-2019, 12:58 PM   #2
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sitting in one place on a hard surface can flatten bearings - not a huge expense to fix
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Old 02-26-2019, 01:07 PM   #3
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Originally Posted by Sleddgracer View Post
sitting in one place on a hard surface can flatten bearings - not a huge expense to fix
Flatten which bearings? Wheel bearings?
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Old 02-26-2019, 01:56 PM   #4
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Flatten which bearings? Wheel bearings?
I bought a rear end out of a motor home, almost zero miles on it, that had sat on the manufacturer's lot for several years - ALL the bearings had a flat spot and had to be replaced - I wound up with a brand new rear end for my old truck to replace the one that had seized for a lot less money than I had expected it to cost - it likely cost the motor home owner a lot more to exchange his new rear end at the wreckers than it cost me to buy his and replace the bearings
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Old 02-26-2019, 02:04 PM   #5
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Check the tires for flat spots. Sitting that long they might have made them out of round which is where you'll get your vibration. Also check that the u-joints are free/greased. Those seizing up from sitting will cause a vibration as well.
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Old 02-26-2019, 02:21 PM   #6
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I've never experienced "flattened" bearings ... at least not from sitting. Much more likely is tires or driveshaft/u-joints. Also, if it's an air-ride, a "flat" suspension would do it too. Check the springs/air bags and suspension for ride height, alignment, or uneven ride height (from side to side, such as if it has a broken spring).


I had a road tractor develop a intermittent, and rather severe vibration with a brand new set of tires. *NOT* recaps, either! We never investigated it, but I suspect one tire was either very much out of balance, or out of round.
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Old 02-26-2019, 02:52 PM   #7
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Originally Posted by Brad_SwiftFur View Post
I've never experienced "flattened" bearings ... at least not from sitting. Much more likely is tires or driveshaft/u-joints. Also, if it's an air-ride, a "flat" suspension would do it too. Check the springs/air bags and suspension for ride height, alignment, or uneven ride height (from side to side, such as if it has a broken spring).


I had a road tractor develop a intermittent, and rather severe vibration with a brand new set of tires. *NOT* recaps, either! We never investigated it, but I suspect one tire was either very much out of balance, or out of round.
I've had new tires that caused a vibration and not from balance, ( maybe from being out of round? ) - a new rim that did the same thing, universal joints, steady bearings that would rattle your teeth, and I bought an almost new rear end that had flattened bearings from sitting in one place for a few years
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Old 02-26-2019, 04:08 PM   #8
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Flat bearings, that the most outrageous thing I've heard in awhile. In my 65 years I've never heard of that being an issue and am trying to figure out exactly can go flat. Is it the bearing race in a circle recess, where can it go flat? Is it the ID where a shaft holes it's shape? What exactly went flat. Without documentation, it didn't happen.
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Old 02-26-2019, 04:27 PM   #9
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Flat bearings, that the most outrageous thing I've heard in awhile. In my 65 years I've never heard of that being an issue and am trying to figure out exactly can go flat. Is it the bearing race in a circle recess, where can it go flat? Is it the ID where a shaft holes it's shape? What exactly went flat. Without documentation, it didn't happen.
flat enough that you could feel it catch when you spun the bearings with your finger - the old German guy that sold nothing but bearings in his store in Bend Oregon said it wasn't all that uncommon in motor homes - going into his store was an eye opener itself - he had 2 or 3 young guys running for the bearings as he read the part numbers and said what they were out of - 6 or 8 people in his store watching in awe of this guy - one man came in with a bearing that had no numbers on it - the old guy picked it up, twirled it in his fingers and said, that looks like a, then spieled out a bunch of numbers - sure enough, that's exactly what the bearing was - it was like watching a circus side show to see that man - there are experts, then there was that guy - I'm pretty sure some of his customers just came to watch him perform - I don't know if his shop would still be there - this all took place over 30 years ago - I'm sure many long time Bend Oregon residents would remember him
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Old 02-26-2019, 04:33 PM   #10
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flat enough that you could feel it catch when you spun the bearings with your finger - the old German guy that sold nothing but bearings in his store in Bend Oregon said it wasn't all that uncommon in motor homes - going into his store was an eye opener itself - he had 2 or 3 young guys running for the bearings as he read the part numbers and said what they were out of - 6 or 8 people in his store watching in awe of this guy - one man came in with a bearing that had no numbers on it - the old guy picked it up, twirled it in his fingers and said, that looks like a, then spieled out a bunch of numbers - sure enough, that's exactly what the bearing was - it was like watching a circus side show to see that man - there are experts, then there was that guy - I'm pretty sure some of his customers just came to watch him perform - I don't know if his shop would still be there - this all took place over 30 years ago - I'm sure many long time Bend Oregon residents would remember him
Still not buying it. Was there a bearing issue, possibly. Was it from sitting and bearing goes flat. You'll need more than one story from long ago to prove it to me. The physics is just not there to substantiate that claim.
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