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Old 02-06-2020, 10:11 PM
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Front control arms squeak

I have tubular upper and lower control arms in the front. The car (2011 Speedster Motorcars Boattail Auburn) has only about 2000 miles on it. The bushings look fine (ie, not cracked or otherwise damaged). At first I thought it was the coil-over shock bushings but I get the squeak when I remove the shocks and move the arms by hand. Do I disassemble and lubricate all of the parts with a moly grease or ??

Also, what is the best approach for fasteners? Currently it had no lock washer or lock nuts. The nuts left quite the scarring marks on the washers which makes me wonder if that is where the squeaking is coming from as I am not seeing any other spots with shiny metal as a telltale for metal-to-metal squeaks.

I appreciate any ideas for solutions.

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Old 02-06-2020, 10:42 PM
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Old 02-07-2020, 07:42 AM
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Have you tried just lubricating them with some penetrating oil in a spray can. My truck will get that way every now and then, I spray them with it and the squeek goes away. Especially if they are rubber in lieu of nylon. Just a thought
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Old 02-07-2020, 09:36 AM
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Quote:
Originally Posted by 39 Sedan View Post
Have you tried just lubricating them with some penetrating oil in a spray can. My truck will get that way every now and then, I spray them with it and the squeek goes away. Especially if they are rubber in lieu of nylon. Just a thought
Petroleum-based lubes will deteriorate rubber over time. Use silicone spray. And frankly, rubber bushings should NOT require any lube. If they squeak, you have a problem that needs to be investigated. Urethane bushings do require silicone lube.
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Old 02-07-2020, 10:17 AM
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Excellent videos - I should have thought of that. Biggest takeaway is to figure out exactly where the problem is. I first thought it was my new coilover's as that's when the sound started. Then I realized it wasn't (see above). Then I realized the control arms with my old way-to-stiff coilovers never allowed the control arms to move. So now they make noise because they didn't move for 10 years?!?!? So of course I sprayed the control arm bushings with everything I had with no change. So I need to look closer, it could be the ball joints. Thanks for the great advice, folks.

How about the nut and washer? My son suggests a flanged lock nut. There was no lock nuts and the nuts gouged and distorted the big flat washer.
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Old 02-07-2020, 01:32 PM
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Nylon nuts work just fine for that.

If you use anything, dry graphite powder is a good choice.
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