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Old 10-31-2015, 07:01 PM   #1
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Vibration and Noise

Hi All,

Just got my 1996 Winnebago Adventurer 34RQ back from the shop and while driving it home noticed something odd. At between 30 and 36 MPH a vibration and loud noise sets in that is completely absent at any other speed. Throttle position makes no difference. I can coast or be under power and the vibration and noise are there regardless.

To complicate matters, I have two variables. I had the front tires replaced and also the parking brake shoes. My first guess was wheel balancing and I will have that checked, but never noticed a noise with unbalanced wheels before. On the other hand, I never drove this big a vehicle before either.

This coach has a Ford 460 on an F53 chassis. Any help would be greatly appreciated.

Thanks!

Rick
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Old 10-31-2015, 07:30 PM   #2
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Is the parking brake not adjusted properly, had one last week at my shop the customer did his own brakes and adjusted the park brake to tight bad vibration and harmonic sound around 35.
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Old 10-31-2015, 07:41 PM   #3
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The parking brake on the F-53 chassis is around the driveshaft behind the transmission. To work on the park brake requires removal of the driveshaft. it could be an improper reinstall of a bad universal joint. I would return the RV to the repair shop. to have it checked.
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Old 10-31-2015, 08:10 PM   #4
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If drive shaft was removed it may have been installed out of phase. The front and back U-joints should be aligned. If not it could be out of balance and cause vibration.
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Old 11-01-2015, 05:15 PM   #5
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Quote:
Originally Posted by jacwjames View Post
If drive shaft was removed it may have been installed out of phase. The front and back U-joints should be aligned. If not it could be out of balance and cause vibration.
+1. The mechanic should have marked the universal joint before taking it apart so it could be reassembled correctly. This needs to be corrected as the drive shaft bearings will soon go bad.
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Old 11-01-2015, 05:25 PM   #6
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I had to have my coach towed to a Cummins shop and work done. After I got it back I crawled underneath to do a general inspection. One of the problems I found was that the driveshaft was assembled out of phase. I corrected myself, there were marks on it to show alignment but the kid they had doing the work must not have had that class in tech school or skipped that day.
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Old 11-02-2015, 12:54 PM   #7
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Culprit

Hi all!

Thanks for the suggestions. I took it back to the service place and the foreman looked at it. Turns out it was the driveshaft hanger. Probably got knocked around when they were doing the parking brake.

All is well, except that the vibration seems to have caused some sort of grounding issue that is affecting the radio and CB. I am now hearing significant alternator whine especially on AM radio. The alternator is charging fine, but I am guessing some ground is faulty somewhere.

Always something
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