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03-14-2016, 11:00 PM
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#1
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Senior Member
Join Date: Nov 2010
Location: California
Posts: 1,012
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How did this break?
__________________
2006 E350 6.0PSD 5R110, SMB 4X4, RB-50, ARB lockers front/rear, Aluminess galore, AMP steps.
Callsign KK6GIY
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03-14-2016, 11:04 PM
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#2
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Senior Member
Join Date: Mar 2013
Posts: 4,244
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Wow, that's a pretty clean and concentric break, was it welded there?
__________________
Arctic Traveller
KC6TNI
2001 GTRV
Advanced 4wd
Agile Ride improvement package
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03-14-2016, 11:44 PM
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#3
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Senior Member
Join Date: Apr 2013
Location: Illinois
Posts: 818
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Have an enemy or ex that owns an electric pipe-cutter? That is too clean not to be suspect! CRAZY!
__________________
'13 MDX 'BigBlackmobeebs'
'01 Lexus 430 LS 'Luxobeebs
'20 Tacoma TRD OR 'Tacobeebs'
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03-15-2016, 07:05 AM
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#4
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Senior Member
Join Date: Jan 2012
Location: Western North Carolina
Posts: 1,258
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Tubular steel snapped in such a clean fashion has two reasons, suspicious activities or a defect in the metal.
Of course I'm not a metallurgist or a detective but I recently stayed in a walmart parking lot LOL.
__________________
Rob.
Current:
2001 E350 PSD w/ a bunch of stuff.
And had three other E350s...
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03-15-2016, 08:14 AM
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#5
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Senior Member
Join Date: Jul 2011
Location: GTA, Ontario
Posts: 1,102
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Overloaded at half span. Harmonics probably worked on it for years.
"Talk is cheap. Whiskey costs money."
__________________
"Talk is cheap. Whiskey costs money."
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03-15-2016, 12:16 PM
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#6
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Senior Member
Join Date: Sep 2011
Location: Rancho Nuevo (Cabo/Todos Santos) B.C.S. and San Diego, CA
Posts: 1,952
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Not the first one I have seen break like that. It looks to be bent as well, but that could just be the picture.
My suspicions: The leaf spring packs and shackles are stiff enough that they resist the side to side movement of the axle that the Panhard Rod (the broken Track Bar) arch travels in, so that they are fighting each other.
Additionally, if the Panhard Rod bushings are in bind rotationally because they are being over tightened or the inside sleeve is too short, it could cause the bend I think I see and failure.
1) While it is still broken, try rotating both ends up and down around the bushings to see if they are too tight.
2) Jack up the van in different scenarios that represent the axle articulation you are experiencing on the road or trail and see how that effects the required length of the Panhard Rod.
3) Report back - we are a curious lot.
__________________
Four time Baja 1000 winner, four time Baja 500 winner. Solo'ed the Baja 1000 to LaPaz/Cabo twice.
4-Wheeling since 1972, Desert Racing since 1989.
AgileOffRoad.com
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03-15-2016, 02:15 PM
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#7
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Senior Member
Join Date: Nov 2010
Location: California
Posts: 1,012
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This is from RAWDAWG's rig. He ordered another rod from SMB today, will report back with more findings when I have a chance to replace it. To your point Ramsey this will happen again if we can't find the root cause.
__________________
2006 E350 6.0PSD 5R110, SMB 4X4, RB-50, ARB lockers front/rear, Aluminess galore, AMP steps.
Callsign KK6GIY
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03-15-2016, 03:30 PM
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#8
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Senior Member
Join Date: Sep 2011
Location: Rancho Nuevo (Cabo/Todos Santos) B.C.S. and San Diego, CA
Posts: 1,952
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It would just be a matter of cycles...
Perhaps it was just under built, too small and thin of tube. I would ask if this has been addressed with a upgraded spec since this build.
Make sure the new unit is not in any bind on install.
You know, a lot of factory leaf sprung front axles applications do not use a Panhard Bar.
__________________
Four time Baja 1000 winner, four time Baja 500 winner. Solo'ed the Baja 1000 to LaPaz/Cabo twice.
4-Wheeling since 1972, Desert Racing since 1989.
AgileOffRoad.com
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03-19-2016, 09:19 AM
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#9
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Senior Member
Join Date: Nov 2009
Location: Pacific Northwest
Posts: 378
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Please give us a close-up shot of the broken metal edges. Looks like a seam welded joint failure. It doesn't look like a good application for seam welded tubing. I've seen cases in other applications where seam welding was prohibited but got in the supply anyhow.
__________________
2010 Ford E250 5.4L V8 Gas 2WD
SMB Mod RB36 w/PH Prop Stove & Furn Frig 10G Wtr Elect
Silver Bullet
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03-19-2016, 12:54 PM
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#10
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Senior Member
Join Date: Aug 2012
Posts: 633
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I was looking at the photos at the larger image size to get a closer look. I think I see a clean part of metal in the top photo between 10 to 2 o clock position. The lower 2/3 of the break looks rusted. Usually this points to a crack that has been there for a long while with the clean attached part finally failing. Also the paint that pooped off near the break is interesting because there appears to be a shinny section and rusted sections. This hints to the idea that the initial crack could have been under paint that had blistered and holding water not necessarily creating the crack but because of the crack/movement. I would agree with others that making sure the rotating ends are not binding would most likely prevent any issue with the next bar. Also kinda far fetched but did happen to us (not on a SMB) was that we had a pan hard bar on a rear axle that kept breaking. What we found was that the axle would wrap because everything in the suspension was worn and would try to rotate the pan hard bar. After a while the bar would brake. The solution was to replace the worn hardware connected to the springs as radius arms just seemed like a band aid solution.
Please let know what you find,
-Eric
__________________
2005 SMB RB 4x4 6.0 PSD
A rocket on the pad is safe,
but it's not what rockets are built for.
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