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Old 03-05-2017, 04:24 PM   #1
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A Couple of Clunks

It's been about 2 years (wow) since I installed some BMR adjustable tubular upper control arms to replace the stock ones and try to improve my camber situation, which they have done nicely.

However, with the whole suspension being as old as it is, of course there are lots of creaks and clunks. I've isolated a clunk on the left and right side of the front suspension, and it turns out to be right where these control arms attach to the frame.

When I jack the front end up and do a shake-down on the wheel, I can hear the same clunk when shaking that I'm hearing while driving, and have isolated it to the upper control arm mounting location. I can think of 3 possible causes and wonder if anyone else who's used these tubular arms has run into the same.

Cause 1: Loose bolts holding the control arm to the frame - I've tried but cannot tighten them any more
Cause 2: Worn spherical bearing - this doesn't seem to be the case but I'm not ruling it out
Cause 3: Adjustable portion of the arms loose - this nut is also as tight as I can reasonably get it.
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Old 03-05-2017, 06:05 PM   #2
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Alright, so I was bored and started turning wrenches.

I think I've found where the clunking is going on: the spherical bearings are held in place on top of the control arm bolts, by what I'll call 2 metal bushings each. They fit over the bolt and make up the gap between it and the bearing, like a normal rubber or polyurethane bushing would.

What's happened is I think these are not a snug fit over the bolt (either by design or because of wear, but I'm guessing by design), and as a result they're dirty and have too much clearance.

They're still functional, but now I see I need to replace them and find a way to prevent this from happening in the future. I'll probably get with BMR and ask what they recommend. It may just be that I need some new bolts. It may also need some kind of lube, but I don't see how you would service these without complete disassembly, and the lube wouldn't last forever because this is all an open design.
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