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Re: LCA repair
[Re: 74_360_Cuda]
#1403052
03/16/13 12:53 AM
03/16/13 12:53 AM
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Joined: Mar 2003
Posts: 18,678
Fresno, CA
Jim_Lusk
I Live Here
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I Live Here
Joined: Mar 2003
Posts: 18,678
Fresno, CA
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The other end of the LCA is held together by large rivets. I think if I had a problem like you are describing I would cut back the lips (if those arms have the lips - check out my video at http://www.youtube.com/watch?v=Nwes-SP8u4w at the 2:28 mark for arms without the lip). Then I would source a steel ring the right diameter (even if I had to make one) and weld it in place to the arm.
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Re: LCA repair
[Re: Jim_Lusk]
#1403053
03/16/13 01:52 AM
03/16/13 01:52 AM
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Joined: Jan 2003
Posts: 27,471
So Cal
autoxcuda
Too Many Posts
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Too Many Posts
Joined: Jan 2003
Posts: 27,471
So Cal
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Quote:
The other end of the LCA is held together by large rivets. I think if I had a problem like you are describing I would cut back the lips (if those arms have the lips - check out my video at http://www.youtube.com/watch?v=Nwes-SP8u4w at the 2:28 mark for arms without the lip). Then I would source a steel ring the right diameter (even if I had to make one) and weld it in place to the arm.
Jim, what do you think about swagging the stamped lip-hole to decrease the ID. Probably need to heat them. In just in 3-4 points spaced roughly equally around the circumference.
You could weld a ring or support to hold it tight. Or would welding just warp up what you swagged over.
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Re: LCA repair
[Re: Jim_Lusk]
#1403055
03/16/13 10:51 AM
03/16/13 10:51 AM
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Joined: Oct 2006
Posts: 387
Montreal PQ, Canada
74_360_Cuda
OP
enthusiast
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OP
enthusiast
Joined: Oct 2006
Posts: 387
Montreal PQ, Canada
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They are the cheaper version without the lip (74 Cuda), I was also suspecting that this is why they have more wear than most peoiple have. I think most of the play is on the FWD side so the T bar recetpacle is not in the way to weld a ring. I will give it a try, thanks! BTW I had already seen your video, thanks for posting valuable info like that! Here is a short video showing the paly I have: https://www.youtube.com/watch?v=6GDpjICbi1AObviously I have a combination of radial & axial play so I will also do your fix.
Last edited by 74_360_Cuda; 03/16/13 02:05 PM.
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Re: LCA repair
[Re: BergmanAutoCraft]
#1403058
03/16/13 10:04 PM
03/16/13 10:04 PM
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Joined: Mar 2003
Posts: 18,678
Fresno, CA
Jim_Lusk
I Live Here
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I Live Here
Joined: Mar 2003
Posts: 18,678
Fresno, CA
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Quote:
Sounds like I need to design a bearing for these...
Do I get any royalties for the idea?????
There really shouldn't be a problem putting one on either side as the lever is in the middle.
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Re: LCA repair
[Re: 74_360_Cuda]
#1403059
03/16/13 10:25 PM
03/16/13 10:25 PM
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Joined: Jan 2003
Posts: 4,323
NY NY
340duster340
master
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master
Joined: Jan 2003
Posts: 4,323
NY NY
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why not just replace the lca. it's 40 years old and worn out.
1966 Dart GT
...down to only 1 mopar for the first time in 15 years!
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Re: LCA repair
[Re: 340duster340]
#1403060
03/16/13 10:41 PM
03/16/13 10:41 PM
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Joined: Mar 2003
Posts: 18,678
Fresno, CA
Jim_Lusk
I Live Here
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I Live Here
Joined: Mar 2003
Posts: 18,678
Fresno, CA
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Quote:
why not just replace the lca. it's 40 years old and worn out.
And the replacement is also 40 years old and needs some attention, too. I also love fixing stuff. I picked up a tweaked A-body k-member so that I could fix it. That job is almost done, but is on hold for a while.
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Re: LCA repair
[Re: BergmanAutoCraft]
#1403062
03/17/13 02:20 AM
03/17/13 02:20 AM
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Joined: Jan 2003
Posts: 27,471
So Cal
autoxcuda
Too Many Posts
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Too Many Posts
Joined: Jan 2003
Posts: 27,471
So Cal
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Quote:
Sounds like I need to design a bearing for these...
Those two surfaces only rotate relative to each other when you adjust the ride height of the car. I think they were not a extremely tight fit to begin with and just 40 years of vibration and road impacts cause wear.
Now you could put a bearing to replace the LCA bushing. You'd run a big spherical bearing in there. But I don't think that would be a good idea for a street car. Most of the load of the front suspention goes through that location. I just don't think they would wear well with street driving and roads. Great for race tracks which are smooth.
It could only be a plain bearing if the absolute center axis of the LCA pivot pin perfectly intersected the center axis of the strut rod to k-member spherical joint. Otherwise there were be binding.
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Re: LCA repair
[Re: Jim_Lusk]
#1403064
03/17/13 03:15 AM
03/17/13 03:15 AM
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Joined: Jan 2003
Posts: 27,471
So Cal
autoxcuda
Too Many Posts
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Too Many Posts
Joined: Jan 2003
Posts: 27,471
So Cal
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Quote:
If it were me I would just put a plain steel bushing together that could be welded to the outside of the LCA, front and rear.
Like a ring with an ID that was very tight with the OD of the pivot adjuster that goes through the LCA?
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Re: LCA repair
[Re: autoxcuda]
#1403065
03/17/13 03:18 AM
03/17/13 03:18 AM
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Joined: Mar 2003
Posts: 18,678
Fresno, CA
Jim_Lusk
I Live Here
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I Live Here
Joined: Mar 2003
Posts: 18,678
Fresno, CA
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Quote:
Quote:
If it were me I would just put a plain steel bushing together that could be welded to the outside of the LCA, front and rear.
Like a ring with an ID that was very tight with the OD of the pivot adjuster that goes through the LCA?
Yup. The rear could be fairly long, too. But, if it were long I might think about having it greasable.
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Re: LCA repair
[Re: Jim_Lusk]
#1403066
03/17/13 03:30 AM
03/17/13 03:30 AM
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Joined: Jan 2003
Posts: 27,471
So Cal
autoxcuda
Too Many Posts
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Too Many Posts
Joined: Jan 2003
Posts: 27,471
So Cal
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Quote:
Quote:
Quote:
If it were me I would just put a plain steel bushing together that could be welded to the outside of the LCA, front and rear.
Like a ring with an ID that was very tight with the OD of the pivot adjuster that goes through the LCA?
Yup. The rear could be fairly long, too. But, if it were long I might think about having it greasable.
I think this is something that wears little by little over a long period of time. And they might not have been that accurate/tight when brand new. I don't know, I don't have an NOS lower control arm.
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Re: LCA repair
[Re: autoxcuda]
#1403067
03/17/13 08:31 AM
03/17/13 08:31 AM
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Joined: Nov 2003
Posts: 3,577
Long Island, NY USA
BergmanAutoCraft
master
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master
Joined: Nov 2003
Posts: 3,577
Long Island, NY USA
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Quote:
Quote:
Sounds like I need to design a bearing for these...
Those two surfaces only rotate relative to each other when you adjust the ride height of the car. I think they were not a extremely tight fit to begin with and just 40 years of vibration and road impacts cause wear.
Now you could put a bearing to replace the LCA bushing. You'd run a big spherical bearing in there. But I don't think that would be a good idea for a street car. Most of the load of the front suspention goes through that location. I just don't think they would wear well with street driving and roads. Great for race tracks which are smooth.
It could only be a plain bearing if the absolute center axis of the LCA pivot pin perfectly intersected the center axis of the strut rod to k-member spherical joint. Otherwise there were be binding.
Not sure what your talking about here. We're talking about the t bar socket assembly not the lca. I'm already making a Delrin lca bushing. I'd take the arms apart and machine something for the inside and reassemble.
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Re: LCA repair
[Re: BergmanAutoCraft]
#1403068
03/17/13 03:18 PM
03/17/13 03:18 PM
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Joined: Feb 2011
Posts: 4,302
Nebraska
72Swinger
master
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master
Joined: Feb 2011
Posts: 4,302
Nebraska
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He's saying the only time that bearing would rotate is when you adjust the torsion bars really. The suspension movement up and down , the bearing would remain static through the whole travel.
Mopar to the bone!!!
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Re: LCA repair
[Re: autoxcuda]
#1403069
03/17/13 08:32 PM
03/17/13 08:32 PM
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Joined: Oct 2006
Posts: 387
Montreal PQ, Canada
74_360_Cuda
OP
enthusiast
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OP
enthusiast
Joined: Oct 2006
Posts: 387
Montreal PQ, Canada
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Making a ring with a precise fit might be difficult to acheive. I was thinking you get a close match and you cut the ring in 4 and weld them individualy. As mentionned there is no rotation going on when the suspension is moving, this is just to transfer the load without discplacement.
Last edited by 74_360_Cuda; 03/17/13 08:33 PM.
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