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Subject:Thumping Noise - Wheel CV Joint Bearing?
From:Jim Davis
Date:Fri, 2 Jul 2010 19:18:28 EDT

Hi friends!

My 1984 Westy is making a new noise.  I've searched the archives but
haven't found an answer and am hoping for some help here.

I have a mild "thumping" noise that seems to be coming from the right/rear
wheel area. The noise is sort of a low pitch thumping, not a clicking or a
clacking.  Sounds sort as if something is rubbing.

The noise frequency moves up and down with vehicle speed.

It makes the noise only when I accelerate or have reasonable power
applied. In other words, when the wheel/axle is under  load. Otherwise when I'm at
a steady speed on level ground there is no  noise.

Axles/CVs: The entire axle/CV joint assemblies on both sides are new.
They were not the most expensive I found, but still, being modestly priced, I
wouldn't expect this from brand new joints. I've checked the joints bolts
and confirmed they're all tight.

Brakes:  When I replaced the axles I also did the brakes, so there are
turned drums, new shoes, and new wheel cylinders. Does not sound like a
shushing  or scraping noise like brakes can sometimes make.

Wheels/Tires:  Tires are new, but I suppose could be out of balance,  but I
suspect I'd feel this as a vibration, not hear it as a noise.

This van is being restored and previously only towed it, so I don't know if
 the noise would have been there before the recent work. Upon the first
couple  test drives, there was no thumping sound but it started to appear after
about 15  miles.

One thing I don't know about is the bearings between the CV  joint and the
brake hub.  Over many years, I've yet to have an issue  or even look at
these in any of my vans. Could this be the source of the  noise?

What should I suspect is making this noise?

Jim Davis

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