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69 AMX Trunnion Question

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javsst View Drop Down
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    Posted: Dec/16/2007 at 2:51am
I've torn down the front suspension on the AMX to replace a number of the dry rotted bushings as well as clean up and paint.

Once question that I have is regarding the trunnions.  How do I tell if I need to disassemble the upper and lower halfs? (Upper trunnion and lower knuckle/shaft).   The car had about 70,000 miles on it.  There doesn't seem to be any up and down or lateral movement in the parts, and the rotation seems to be smooth.

Thanks!

Steve
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Post Options Post Options   Thanks (0) Thanks(0)   Quote PHAT69AMX Quote  Post ReplyReply Direct Link To This Post Posted: Dec/16/2007 at 12:02pm
Understanding is if the trunnion is not sloppy on the king pin you should be good to go.
And as long as the thurst bearing under the trunnion on the king pin is good also.
 
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Post Options Post Options   Thanks (0) Thanks(0)   Quote javsst Quote  Post ReplyReply Direct Link To This Post Posted: Dec/16/2007 at 3:27pm
So, it may be a good idea to take apart the upper trunnion and king pin apart to check the thrust bearing?

Thanks!

Steve
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Post Options Post Options   Thanks (0) Thanks(0)   Quote PHAT69AMX Quote  Post ReplyReply Direct Link To This Post Posted: Dec/16/2007 at 3:36pm
Trunion Thrust bearing is below, seperate, and visible while assembled I believe.
May want to disassemble and inspect internal features, bore, king pin, etc.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote javsst Quote  Post ReplyReply Direct Link To This Post Posted: Dec/16/2007 at 11:56pm
Probably a real good idea, check for scoring and bearing wear.

Thanks again!

Steve
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Post Options Post Options   Thanks (0) Thanks(0)   Quote farna Quote  Post ReplyReply Direct Link To This Post Posted: Dec/17/2007 at 12:28pm
I'd disassemble and clean it, and add a little grease when reassembling. The big "rubber" bushing in the top turns inside the housing (it's supposed to!), and was intended to be replaced when worn, never greased. It also wasn't intended to last almost 40 years. A light coat of lithium (or other synthetic grease) shouldn't hurt it a bit. Many people drill and tap them for a grease fitting, another good idea while you have it off. With the new grease it should last a lot longer, at least with "normal" driving. If you intend to autocross or road race a bit I'd go ahead and get the urethane bushings to replace the originals and install a grease fitting.

That said, I've only messed with a couple of that type trunnion on 64-69 Americans, and it's been a while. Others here used to dealing with early Javelins and AMXs know a good deal more than I! Now ask me about the early type trunnions in the big cars and 58-63 Americans... I know them all to well!!


Edited by farna - Dec/17/2007 at 12:28pm
Frank Swygert

American Motors Cars Magazine

www.amc-mag.com
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