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#420794 - 03/12/03 01:54 AM Lower Control Arm Failure and Fix
XOC Offline
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Two years ago I posted a picture of fractures starting around the shock mount on the lower control arm.



I posted an updated picture last year as the fracture began to worsen.



Being a procrastinator, I put off fixing it until last night, after it had progressed to the following.



I new it was getting bad, but hadn't been driving the Xterra lately, and only noticed this amount of damage after lending my X to a friend who lives at the end of 15 miles of washboard. That large amount of bumpy miles finally did it in.

Erik from RMXC came over with his welder last night to finally put a band-aid on this problem (which I have seen happen to completely stock Xterras).

First we got the mount back to its initial position with a c-clamp, and cleaned up the area for welding.



I then (doing my best MVM impersonation) cut and shaped some straps to go over the shock mount.



The cracks were welded, then the strap was laid over the shock mount and welded in place. It isn't pretty, but it's a lot better off than it was, and should hold up to a few more years of abuse.



If you wheel your Xterra, you might want to take a look at this area of the lower control arm as it appears to be a weak spot.
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#420795 - 03/12/03 02:41 AM Re: Lower Control Arm Failure and Fix
ChuckH Offline
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Registered: 27/02/01
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Looks good Ian. Last I looked mine were still fine, but I don't do nearly as much wheeling as you. If the time comes I will surely use your idea! smile
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#420796 - 03/12/03 06:38 AM Re: Lower Control Arm Failure and Fix
OffroadX Offline
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Registered: 17/08/00
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So far so good, had a look for this specific problem when I changed my oil last weekend.
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#420797 - 03/12/03 07:11 AM Re: Lower Control Arm Failure and Fix
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Good remind info....

I need to look at that. I haven't noticed any cracking on my usual once-over inspections, but I will look more closely now.

Looks like a good fix, too.
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#420798 - 03/12/03 09:11 AM Re: Lower Control Arm Failure and Fix
OffroadX Offline
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Registered: 17/08/00
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Loc: Baltimore, MD
Might be a good time to remind folks that this is caused by the fact that the Bilstein shocks aren't quite long enough, right? Something about how they measure length to the end of the mount vs. most measure to the eye or something...

Brent
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#420799 - 03/12/03 10:14 AM Re: Lower Control Arm Failure and Fix
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It's uncertain what causes it.

I ran Rancho 9000 shocks when the X was stock height, and they were a bit short. I installed the SLR lift in March of 2001, and the cracks were apparent by September. In July of 2002 I switched to the CALMINI lift and have run both CALMINI shocks and Bilsteins, both of which are long enough at full droop.
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#420800 - 03/12/03 04:29 PM Re: Lower Control Arm Failure and Fix
EMT_Diver Offline
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Registered: 20/06/01
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Ian - what size was the band iron you used 1/8th? and how did you guys weld it up arc or MIG? nice weld pattern whoever did it !!
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#420801 - 03/12/03 06:25 PM Re: Lower Control Arm Failure and Fix
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It was 1/8"x1.5" weld steel from the local hardware store (I was on a budget). I ground the center down to just under an inch wide to fit in the shock mount. MIG welder I believe, Erik did all that work.
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#420802 - 03/12/03 06:43 PM Re: Lower Control Arm Failure and Fix
ChuckH Offline
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That's a good wire feed bead, but It doesn't appear that gas was used (required for MIG).

Aside from some spatter, another way to tell is that most welders that you would just pick up and carry somewhere like that won't weld anything that thick using gas. A small 110V wire feed welder (which I suspect was used) hooked up with gas for MIG welding will only do sheet metal.
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#420803 - 03/12/03 06:45 PM Re: Lower Control Arm Failure and Fix
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There was a big tank of gas here.
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#420804 - 03/12/03 06:48 PM Re: Lower Control Arm Failure and Fix
ChuckH Offline
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Registered: 27/02/01
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Quote:
Originally posted by xoc:
There was a big tank of gas here.
That was MIG then. He must have a bigger welder than I thought. I don't think my little portable welder would do 1/8" using gas.
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#420805 - 03/12/03 06:50 PM Re: Lower Control Arm Failure and Fix
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I don't know what to say, I know a lot more about breaking things than welding them.
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#420806 - 03/12/03 07:41 PM Re: Lower Control Arm Failure and Fix
Axle Offline
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A 110V MIG using a flux core wire can do 1/8" and no gas is required.
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#420807 - 03/12/03 08:19 PM Re: Lower Control Arm Failure and Fix
ChuckH Offline
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Registered: 27/02/01
Posts: 5206
Loc: Seattle, WA
Quote:
Originally posted by Axle:
A 110V MIG using a flux core wire can do 1/8" and no gas is required.
True (sort of), and infact a 110V welder will do heavier than 1/8" using flux core wire. Mine will do 1/4" using flux. However, flux core welding is not a MIG process. MIG uses gas to shield instead of flux and that's what makes it a MIG process. I have the gas kit for mine but have never used it because all the welding i've done with it was too heavy.

Anyway, just wanted to clear that up. wink

Ian's probably really excited this turned into a welding thread! [LOL]
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#420808 - 03/12/03 11:53 PM Re: Lower Control Arm Failure and Fix
Paul H Offline
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Registered: 23/08/01
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Good MVM impression lol
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#420809 - 04/12/03 06:38 AM Re: Lower Control Arm Failure and Fix
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Registered: 16/08/00
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Now stop doing your Chia impressions of breaking your junk. laugh
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#420810 - 04/12/03 07:27 AM Re: Lower Control Arm Failure and Fix
imacsae Offline
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Registered: 22/04/01
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Rats I didn't know that it would eventually get that bad. My lower control arms are showing the cracks from your first picture. At least now I know where it will be heading.
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#420811 - 04/12/03 10:19 AM Re: Lower Control Arm Failure and Fix
Erik Offline
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Registered: 30/03/02
Posts: 118
Loc: Chapel Hill, TN
Quote:
Originally posted by ChuckH:
Quote:
Originally posted by xoc:
[b]There was a big tank of gas here.
That was MIG then. He must have a bigger welder than I thought. I don't think my little portable welder would do 1/8" using gas.[/b]
Correct, it was MIG. 1/8" is the thickest I can weld with my welder using gas. I could of used flux core, but I'm better with gas. laugh

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#420812 - 04/12/03 12:21 PM Re: Lower Control Arm Failure and Fix
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Quote:
Originally posted by Paul Hartwig:
Good MVM impression lol
Flannel and sparks baby !

Maybe it's time to get that tattoo. laugh
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#420813 - 04/12/03 03:42 PM Re: Lower Control Arm Failure and Fix
KJ_dragon Offline
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Registered: 28/08/01
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nice clean CV boot.
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#420814 - 04/12/03 04:28 PM Re: Lower Control Arm Failure and Fix
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Quote:
Originally posted by KJ_dragon:
nice clean CV boot.
That I can't explain.
It should look like the inner one. Erik did wrap them in wet rags to keep them cool, maybe it got some of the muck off.
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#420815 - 04/12/03 06:10 PM Re: Lower Control Arm Failure and Fix
KJ_dragon Offline
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Registered: 28/08/01
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Loc: East Bay, CA
But its clean in this pic?



It looks like nobody have done any cleaning yet. How the heck did the boot not get dirty like the rest of the area? Even if you cleaned it, you couldn't get it THAT clean. It looks brand new.
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#420816 - 04/12/03 06:43 PM Re: Lower Control Arm Failure and Fix
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Actually, I have a theory. After our Halloween run (where I got it muddy) I forgot to unlock the passenger side hub. For the next month I wondered why my mileage had decreases, but I was certain the hub was unlocked. I park on the right side of my garage, so I could never take a peek at it, and any time it was out of the garage, I would forget to look (I've never left a hub locked before).
With one hub locked, the other shaft would turn the opposite direction. That plus the movement of the boot from steering action could have been enough to fling every bit of crap off the boot over the course of a month.
If you look closely, there is still dirt on the boot right near the small band.
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#420817 - 04/12/03 06:53 PM Re: Lower Control Arm Failure and Fix
2001frontier Offline
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Registered: 20/12/01
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Loc: Fort Worth, TX
I have a theory about this. I wheel my truck hard and have not developed these cracks. I run RS5000s. Maybe the to short shock started the initial crack, and the proper length ones just made it worse over time. What do you think Ian? It seems like a proper length shock should never do that.
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#420818 - 04/12/03 09:50 PM Re: Lower Control Arm Failure and Fix
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Which RS5000 model do you use, because Rancho does not make one that fits correctly.
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