Broken Sidecar Frame

Are ya having a problem with your rig? We'll try to help. Share your tech tips and experiences here. Dr. Billy Glaser, author of the "Unofficial 750 Ural Service Manual" site myural.com, is moderating this section.
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GHGoodwin
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Re: Broken Sidecar Frame

Post by GHGoodwin » Thu Jan 16, 2020 10:45 pm

I'm with jeffsaline. Fit an internal sleeve and tig it together a bit at a time.
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Claus
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Re: Broken Sidecar Frame

Post by Claus » Fri Jan 17, 2020 4:34 am

jeffsaline wrote:
Thu Jan 16, 2020 8:42 pm
My long distance guess is the failure is from the assembly welds and is in the heat affected zone (HAZ) of those welds.

I'll venture if I was fixing this frame I would probably put a piece on the inside of the frame for alignment and strength. After that was in and welded I would probably add a piece to the outside of the frame on at least two sides.

Maybe consider buying a lottery ticket as it seems you got lucky with this.

Best,

Jeff
Absolutely. I had a 2WD 2017 Ural rig in the shop where the side car frame broke due to welding failure. I cut it, turned a well fitting piece on the lathe (ot of a thick walled pipe), inserted it and welded it back together. i reckon this will never break again.
owned bikes: 93 Ural rig domestic model, 95 Suzuki DR 650 RSE, BMW R100GS, Suzuki GSX1100G rig, BMW R100R rig with Ural sidecar, Ural rig with BMW drivetrain under construction,

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Re: Broken Sidecar Frame

Post by VWK75S » Fri Jan 17, 2020 7:28 am

You don't have Chuck in the trunk?
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Re: Broken Sidecar Frame

Post by Claus » Fri Jan 17, 2020 8:54 am

Chuck?
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Re: Broken Sidecar Frame

Post by xpatriot » Fri Jan 17, 2020 11:26 am

I know you said you had everything that was painted blasted, epoxied and re-painted, but it looks like a crack had developed and has been there for enough time to rust. If you look closely only a portion of the metal was left intact....which is probably why it broke without a large impact. I’m not sure if looking at it more closely can determine if this was prior to that process or not and/or if there are other cracks present.
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Re: Broken Sidecar Frame

Post by chaos2 » Fri Jan 17, 2020 11:28 am

harryball wrote:
Thu Jan 16, 2020 7:34 pm
Just wow. Something new to be paranoid about.
UPS ............ Ural Paranoid Syndrome :D
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Re: Broken Sidecar Frame

Post by Claus » Fri Jan 17, 2020 12:22 pm

I was not shocked but surprised how thin the tube wall on the new side car frames is. And they spared the welded cap at the tube´s end and closed the tube with a plastic cap, the tube was very rusty inside (after hardly 2 years!). This is totally different to what I know from the 90ies and early 2000s. I cut lots of Ural side car frames in pieces to rebuild them to fit BMW and other motorcycles.
On thin tubes the welding must be done with much more skills (or at least the given processing instructions must be followed). On the frame I repaired recently, the welding caused a notch effect near arc that holds fender and shock.
owned bikes: 93 Ural rig domestic model, 95 Suzuki DR 650 RSE, BMW R100GS, Suzuki GSX1100G rig, BMW R100R rig with Ural sidecar, Ural rig with BMW drivetrain under construction,

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Re: Broken Sidecar Frame

Post by cookiemech » Fri Jan 17, 2020 1:15 pm

xpatriot wrote:
Fri Jan 17, 2020 11:26 am
I know you said you had everything that was painted blasted, epoxied and re-painted, but it looks like a crack had developed and has been there for enough time to rust. If you look closely only a portion of the metal was left intact....which is probably why it broke without a large impact. I’m not sure if looking at it more closely can determine if this was prior to that process or not and/or if there are other cracks present.
My welder friend was here this morning and said the same thing, that there probably had been an existing crack and that it didn't take much to complete the break. I don't know why the guys who did the blasting didn't see the crack, as they were pretty careful with their work and repaired some other areas with rust damage before repainting.

So now all I have to do is tear the whole works down so that he has only the sidecar frame to work with. At least all the fasteners are fresh and it won't be too difficult, only time-consuming.
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Re: Broken Sidecar Frame

Post by Snakeoil » Fri Jan 17, 2020 9:37 pm

If rust inside tubing is from water ingestion, I would drill a drain hole or two if the point of entry cannot be found.

Fracture is straight. So, does not appear to have been caused by a cockeyed frame forced to be straight and then welded. But, I still would make sure the tubes are in line when relaxed before I welded it back up. Don't twist them together with a clamp and weld. Over-correct if necessary until they stay aligned without external force.
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Re: Broken Sidecar Frame

Post by GregAus » Sat Jan 18, 2020 2:56 am

Gobium had a very nice reinforcements for the 2WD sidecar frames.
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Re: Broken Sidecar Frame

Post by cookiemech » Sat Jan 18, 2020 7:13 am

This looks as though it reinforces the loop next to the sidecar wheel . . . not sure how it would have helped?
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Re: Broken Sidecar Frame

Post by VWK75S » Sat Jan 18, 2020 7:19 am

Claus wrote:
Fri Jan 17, 2020 8:54 am
Chuck?
Image
viewtopic.php?f=10&t=53678&hilit=wtf+chuck#p684999
John
The Ural's made Maine a much bigger state.

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Re: Broken Sidecar Frame

Post by Claus » Sat Jan 18, 2020 10:25 am

ah! Thanks!
owned bikes: 93 Ural rig domestic model, 95 Suzuki DR 650 RSE, BMW R100GS, Suzuki GSX1100G rig, BMW R100R rig with Ural sidecar, Ural rig with BMW drivetrain under construction,

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Re: Broken Sidecar Frame

Post by Tomcatfixer » Sat Jan 18, 2020 12:41 pm

This looks as though it reinforces the loop next to the sidecar wheel . . . not sure how it would have helped?
I believe you're looking at the wrong reinforcement. I think Greg is talking about Gobium's "snowmen" mount brace, which is welded to the rear sidecar frame tube on either side of your break.

2020-01-18 11.38.56.jpg
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Re: Broken Sidecar Frame

Post by cookiemech » Sat Jan 18, 2020 12:44 pm

Ohhh . . . Thanks, Chad. Since it was painted same as the frame, I didn't even notice it.

I'll ask my welder if he would do something similar to my frame. That certainly would have held the works together, and likely prevented the break in the first place.
1982 BMW R100T
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1995 BMW K75/3
2009 Kawasaki KLR 650
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2017 Harley-Davidson Road Glide Ultra
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