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  #1  
Old November 25th, 2006, 08:15 PM
nosivad_bor nosivad_bor is offline
Rob Davison
 
Join Date: Sep 2003
Location: Pittsburgh, PA
Posts: 1,051
Oh me Oh my... OME...



Just doin' my thing out in Joshua tree this weekend with Sinuhe.

All was going well until I some how destroyed both of my rear shocks.

I think once the first one went (last picture) the other side went from being over worked.

Makes for a good story though , right?

Oh 150 miles home with no rear shocks - pretty interesting.

-Rob
Attached Images
File Type: jpg Joshtree 002b.jpg (129.3 KB, 210 views)
File Type: jpg Joshtree 004b.jpg (132.2 KB, 223 views)
File Type: jpg Joshtree 008b.jpg (135.5 KB, 213 views)
File Type: jpg Joshtree 039b.jpg (149.4 KB, 209 views)
File Type: jpg Joshtree 040b.jpg (139.4 KB, 210 views)
File Type: jpg Joshtree 041b.jpg (133.9 KB, 220 views)
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  #2  
Old November 26th, 2006, 07:02 AM
Mike_Rupp Mike_Rupp is offline
Mike Rupp
WZ7V
 
Join Date: Apr 2004
Location: Mercer Island, WA
Posts: 864
Rob, I see that you have some aftermarket shock mounts in the rear. Don't you have a standard OME spring lift? Is it possible that you are bottoming out your shocks because of the lowered top shock mounts?

I've got 762s with a 1.5" spacer, lowered shock mounts and standard OME shocks in the rear and haven't had a problem. I've got about 25K miles on the shocks. I've broken a bushing cup (not sure if thats the correct term), but never had an issue with the shocks themselves.
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  #3  
Old November 26th, 2006, 08:01 AM
nosivad_bor nosivad_bor is offline
Rob Davison
 
Join Date: Sep 2003
Location: Pittsburgh, PA
Posts: 1,051
Mike,

Those mounts lower the top point by two inches. I have OME lift of about 3" in the rear. This would allow the shock to extend down greatly but somewhat limit upstroke. I guess it's possible that I stuffed the tire a few times so hard it started to damage the shock, it was certainly not on this trip. If it's the case then I'll need some bumpstops to prevent this.

What I think happened is I had the truck really working on these rocky mining roads and the speed and vibration just found a weakness. Once the first shock broke it was only a mile later before the other one started making noise and broke.

The 2nd shock I left on the truck because it didn't break at the weld, but internally somehow. In a few hours it will be off and I'll post a picture.

I wonder if I have overworked the shock letting it bounce severly leading to the failure. Should I get LTR's to keep them cooler and can they handle stress better?

rob
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  #4  
Old November 26th, 2006, 09:47 AM
nosivad_bor nosivad_bor is offline
Rob Davison
 
Join Date: Sep 2003
Location: Pittsburgh, PA
Posts: 1,051
I've removed the shocks and they both broke roughly in the same place.

The 18mm shaft steps down to 12.3mm which is inserted into the steel stone shield. The step provides a shoulder for the stone shield to sit against.

It appears that the bushing ring, shaft and stone shield are all welded together at this point. The welding occurs from the top only. My failure, in both circumstances, included the shearing of the shaft.

Both shocks appear to still be in working order aside from the breakage. I ran a quick test by pushing the shaft in as far as I could on each shock and let them rebound. I held them so that gravity would assist. Surprisingly the shock which still has the stone shield attached was over an inch shorter when the other shock reached it's maximum length. So they are not working at the same rate.

Here are more pictures.
Attached Images
File Type: jpg ome 001b.jpg (139.9 KB, 181 views)
File Type: jpg ome 005b.jpg (137.6 KB, 178 views)
File Type: jpg ome 006b.jpg (128.4 KB, 180 views)
File Type: jpg ome 007b.jpg (154.5 KB, 173 views)
File Type: jpg ome 009b.jpg (138.7 KB, 178 views)
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  #5  
Old November 26th, 2006, 01:08 PM
montanablur montanablur is offline
Sinuhe Xavier
yes
 
Join Date: May 2006
Location: Neither here, nor there...
Posts: 584
Fun trip for throwing it together in 10 minutes!
Here is a link to more pics...
http://tinyurl.com/yceuxf
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File Type: jpg 306823917_3d6c4d66f6.jpg (178.2 KB, 175 views)
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  #6  
Old November 27th, 2006, 09:00 AM
johnlee johnlee is online now
John Lee
K6YJ
 
Join Date: Sep 2003
Location: Torrance, CA
Posts: 16,160
LOL.

Rob, send the shocks back to us and I'll try to get them warrantied by ARB USA.
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  #7  
Old November 27th, 2006, 11:23 AM
Mike_Rupp Mike_Rupp is offline
Mike Rupp
WZ7V
 
Join Date: Apr 2004
Location: Mercer Island, WA
Posts: 864
Rob, what exactly is your OME 3" lift? What springs / spacer? Do you have retainers or sway bar? I'm still thinking that bottoming out & weakening the shocks is the issue.
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  #8  
Old November 27th, 2006, 11:52 AM
nosivad_bor nosivad_bor is offline
Rob Davison
 
Join Date: Sep 2003
Location: Pittsburgh, PA
Posts: 1,051
Quote:
Originally Posted by Mike_Rupp
Rob, what exactly is your OME 3" lift? What springs / spacer? Do you have retainers or sway bar? I'm still thinking that bottoming out & weakening the shocks is the issue.


I have OME 781 springs in rear, I have the longer of the two springs matched + Land Rover Isolator things top and bottom with EE retainers.

No sway bar in rear.

Scorpion racing upper shockmounts.

I dont think they are over extended, that would be a sick amount of drop.

To go up I've jsut assumed the spring would stack before that would cause a problem. But could be it also tire would rub fender badly and that doesn't happen too often.

im not sure what the problem was.
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  #9  
Old November 27th, 2006, 11:57 AM
montanablur montanablur is offline
Sinuhe Xavier
yes
 
Join Date: May 2006
Location: Neither here, nor there...
Posts: 584
It could have been all those sweet jumps?
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  #10  
Old November 27th, 2006, 01:23 PM
Mike_Rupp Mike_Rupp is offline
Mike Rupp
WZ7V
 
Join Date: Apr 2004
Location: Mercer Island, WA
Posts: 864
Rob, with the 781s and less than one inch of spacer, you could possibly compress the spring enough to bottom out the shock. When you get new shocks, I'd take the truck somewhere where you can get cross-axled and see how much more up travel you have left and make changes from there, if needed.

On my truck, I've probably got 3/4" more lift and stiffer springs and was pretty close to bottoming out using the lowered mounts.
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  #11  
Old November 27th, 2006, 01:44 PM
nosivad_bor nosivad_bor is offline
Rob Davison
 
Join Date: Sep 2003
Location: Pittsburgh, PA
Posts: 1,051
perhaps its time for some forklift action here at work....
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  #12  
Old November 27th, 2006, 09:26 PM
dchapman dchapman is offline
Daniel Chapman
KJ4BXR
 
Join Date: Dec 2005
Location: VA
Posts: 1,126
I had the same break. Yet, the vendor did not want to talk about it.

I had stock mounts and a 2" OME spring at the time.

Time for 7100's, Rob.
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  #13  
Old November 29th, 2006, 09:26 AM
JSQ JSQ is offline
Jack Quinlan
KI6CTP
 
Join Date: Apr 2004
Location: San Diego
Posts: 3,491
I've had really good luck with the LTRs. Not very flexy travel-wise, but they seem very tough. I've had my heavily-laden disco airborne a couple times, but that's nothing in comparison to the constant pounding at 40mph on those long rough roads for hundreds and hundreds of miles.

Of course, john breaks them with ease.
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  #14  
Old November 29th, 2006, 04:49 PM
nosivad_bor nosivad_bor is offline
Rob Davison
 
Join Date: Sep 2003
Location: Pittsburgh, PA
Posts: 1,051
Quote:
Originally Posted by JSQ
I've had really good luck with the LTRs. Not very flexy travel-wise, but they seem very tough. I've had my heavily-laden disco airborne a couple times, but that's nothing in comparison to the constant pounding at 40mph on those long rough roads for hundreds and hundreds of miles.

Of course, john breaks them with ease.

I've replaced with the same shocks in the rear. everythings feels really stiff now. lol.
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  #15  
Old February 16th, 2010, 01:23 PM
dchapman dchapman is offline
Daniel Chapman
KJ4BXR
 
Join Date: Dec 2005
Location: VA
Posts: 1,126
On the rear axle, is it worth retaining the bushing cups? Reason I ask is because my OME rubber bushings are trash and I have a lot of slop back there now. Lots of knocking and banging and there is no way to tighten things up because the bushing cups get in the way of the lower centering washers.

The shocks are roughly 1.5 years old and have roughly 13,000 miles on them. That's not a lot of miles but the bushings are toast.

Just wondering what the general consensus is here; 1) Remove the cups and use the additional centering washers, or 2) go to poly bushings?
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  #16  
Old February 16th, 2010, 01:43 PM
johnlee johnlee is online now
John Lee
K6YJ
 
Join Date: Sep 2003
Location: Torrance, CA
Posts: 16,160
Dan,

You running N44s? The N44s came with yellow poly bushings.
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  #17  
Old February 16th, 2010, 03:26 PM
dchapman dchapman is offline
Daniel Chapman
KJ4BXR
 
Join Date: Dec 2005
Location: VA
Posts: 1,126
That's what I thought, and the top bushing is the yellow poly. But the bottom bushings on the truck now are the black rubber. I can't imagine I would have ditched the yellow bushings that came with the shocks and installed the old rubber bushings from the old shocks. That would have been dumb. So that makes me wonder if I received the yellow bushings with my shocks. I can't remember and I can't find any pics from my install where it shows a bag of parts...

Either way I need to buy new bushings.

But what about the cups?
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  #18  
Old February 16th, 2010, 03:27 PM
johnlee johnlee is online now
John Lee
K6YJ
 
Join Date: Sep 2003
Location: Torrance, CA
Posts: 16,160
Keep the cups.

I'm guessing the problem is your bushings and not the cups.
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  #19  
Old February 16th, 2010, 04:37 PM
nosivad_bor nosivad_bor is offline
Rob Davison
 
Join Date: Sep 2003
Location: Pittsburgh, PA
Posts: 1,051
LOL

Remind me to call you guys some time and sort my suspension out.
____________________
-Rob
1999 Discovery 1

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