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daywilmOffline
Post subject: A-arm Pivot Information Needed  PostPosted: Feb 18, 2013 - 03:10 PM
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Joined: Nov 22, 2009
Posts: 279
Location: Tulsa, Oklahoma
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I'm trying to make sure I understand the finer points of a replica suspension so I don't do something that wears out the bushings too fast. I am using NAERC A-arms and have UHMW bushings with steel inserts per Jim Dinner's layout. My question is, what should be rotating against what? It seems to me that as the suspesion moves up and down, the ID of the steel insert should rotate on the OD of the bolt going through it that also has the "cams" on the ends. But in order to keep the cams from moving you have to tighten the bolt tight enough that it seems it would keep the bushing and steel insert from moving which would make the A-arm slide on the OD of the bushing. I'm thinking this would prematurely wear out the UHMW bushing. Anybody out there a suspension expert and can tell me what is correct?
Mike
 
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jdinnerOffline
Post subject:   PostPosted: Feb 18, 2013 - 07:46 PM
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The bolts needs to be super tight. In doing so it locks the cams and center steel tube to the frame bracket. The bushing is ideally locked too but this is not always the case.
The inside diameter of the A arm end tubes should move on the bushing. It can either move at that point or around the center steel tube.
I use synthetic grease on the inner and outer of the bushing.

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daywilmOffline
Post subject:   PostPosted: Feb 18, 2013 - 08:10 PM
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Thanks Jim, you always come through and it is appreciated. I'm also relieved that the a-arm tube is supposed to rotate on the bushing as you described since that is the only thing I could see that was going to happen on this type of set up. I just wasn't sure about it and now I am!
Thanks again,
Mike
 
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EAMartinOffline
Post subject:   PostPosted: Feb 23, 2013 - 05:47 PM
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Joined: Jan 04, 2008
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Actually the plastic bushing should be a tight fit to the a-arm and the plastic bushing should rotate on the sleeve that is over the bolt. That way any wear occurs with the plastic bushing and the inner sleeve which are both replaceable.
 
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