Crack behind weld.

[fly-n-hi]

I have a situation involving a stress crack on a 1600 car. See first photo.

The tube below it has been sleeved\rossete welded and I was wondering if I should do the same thing here (see 2nd photo ) or if I should just gusset it ( see 3rd photo )and weld up the crack.

Or maybe cut out the tube, replace it and sleeve it externally like my front end (see last photo )


???????????

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[matt_helton]

id cut that whole tube out and replace it. and when you re-make your upper trans mount tube, make that tube overlap the bottom of the joint where that crossmember tube hits the midrail.

[fly-n-hi]

"make that tube overlap the bottom of the joint where that crossmember tube hits the midrail. "




Kind of confused about what you mean, so here are a few more angles. Its has the same crack on the opposite side of the tube behind the oil filter. As you can see the tube is braced in about four spots and replacing it looks like a lot of work......I'm not scared, just sayin. Where should I start???

[stealthcammo1]

cromoly? my neighbors class 9 did the same. i drilled out the ends of the cracks with a 1/4 inch bit and then weld up the crack. also adding that brace afterwards would be a good idea.

[empire_637]

I would do what matt's saying cut the old tube off and replace it with a new one.

[DBMETALWORX]

I would cut it out and replace it.. It obviously takes a beating, so you may want to step up the thickness as well..

[fly-n-hi]

So basically cut it out like this??????.......See photo

What would be the best way to cut it out (tool wise)?? I know I can hack it off with anything, but Im talking about cutting it clean, so that the new piece fits nicely ( plasma\flap wheel, cutoff wheel\flap wheel, etc.)????????


I have never replaced a tube that has been fishmouthed into at multiple spots along the tube. What are the do's and don'ts????

[Brian Mapes]

The best fix for that would be to completely remove the old tube that is cracked. Then grind away the old welds as well. Make your new tube and put it in. Weld it all up then add the gusset like you pictured in the beginning. Use whatever tool will fit in the area. Plasma or sawzall would be my choice, then use some type of grinder to finish the job clean.

[fly-n-hi]

when you re-make your upper trans mount tube, make that tube overlap the bottom of the joint where that crossmember tube hits the midrail.

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[DBMETALWORX]

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