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Old 04-08-2013, 08:16 PM   #1
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1992 33' Land Yacht
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Vibration from the driveline

I seem to have a vibration after 40 and up to speed then after a while it goes away, smooth as can be then back again after say a hill , let off get back up to speed and after awhile it goes away. Is this normal ?
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Old 04-09-2013, 04:53 AM   #2
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I have no experience with motorhomes, but on a regular vehicle (like a pickup), this could be a driveshaft U-joint or center carrier bearing (if used on your vehicle). A bad U-joint or carrier bearing will vibrate at a specific speed, often between 35 and 45 mph, especially under load (accelerating or decelerating). Also, transitions between accelerating and decelerating will be accompanied by a loud "clunk".

This is easy to troubleshoot; and you can do it yourself, or have it checked for free, or a very minimal charge. Usually, the parking brake is set, then someone observes the U-joints while the transmission is changed from drive to reverse several times. If a U-joint is bad, you can see and hear a big clunk when the driveline torque is reversed. (It will be really obvious, if the roller bearings have failed and have ground up and fallen out.) A bad carrier bearing (if so equipped) is less obvious; and you may need to drop one end of the driveshaft to check it.

If this is the problem, repair is relatively simple; although, perhaps not easy. The driveshaft must be removed, and it is heavy. Please, let us know if the U-joints are bad; and we can provide more details, if you wish to perform the repairs yourself. Otherwise, observe the repairs being done; and you can do this yourself, next time, if you wish.

There are other things that can cause vibrations. However, if this started suddenly and there were no vibrations, previously, this is a common failure.

If the U-joints and carrier bearing are OK, you might want to check to make sure all lug nuts are tight, wheels are not bent, and no wheel weights are missing.
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Old 04-09-2013, 01:17 PM   #3
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This beast had this vibe when I brought it home.
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Old 04-09-2013, 01:37 PM   #4
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In that case, I'd start with the cheapest troubleshooting charges:

You can do these yourself:

* Lug nuts

* Driveshaft U-joints and carrier bearing(s)

* Engine motor mounts

* Have someone follow your motorhome and observe wheels/tires while you recreate the vibration. They may be able to see which one is the culprit.


You will have to pay to have these done. However, the repair facility may credit the troubleshooting charges to the actual repair, if you have them do the actual work.

* Wheel balance. Also, while the wheels are on the tire balancing machine, have the tire tech check for bent wheels and tire runout (out-of-round). If you can isolate where the vibration is coming from (front, rear, left/right side), start with that side or axle first; and you may not have to have all of them done.

* Driveshaft bent or out of balance (this could be costly, so do this last).
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Old 04-09-2013, 02:21 PM   #5
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The tires may have balance beads in them and have clumped due to moisture. The tires will never balance on a balance machine with beeds in them. The tires may also be out of round from sitting for a few years.
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