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Thread: Frame Repair

  1. #1
    Dead or alive... mudtoy67's Avatar
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    Frame Repair

    The years have finally taken a toll on my truck's frame, producing a 3" long crack behind the driver's radius arm drop bracket.



    What's the proper way to fix this? From what I've understood I need to drill a hole at the end of the crack to relieve the stress there and keep the crack from continuing. Also I need to grind a groove along the crack to give the weld something to flow into. But should I do this on both sides or just the outside? The crack is very close to the body mount rivets so I dont think I could plate the inside of the frame, but I do think I can box the frame to help strengthen the frame in the in the drop bracket area. Any other ideas?
    BDR

  2. #2
    Like my rock crawler? KrazyKarl02's Avatar
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    Proper way to fix it, get a new frame

    Pilot hole drilling will stop the crack... To weld it you need to gouge it or grind it till there is no trace of the crack, then weld it. After welding I would stress relieve by letting the metal cool very slowly, maybe some sort of thermal wrap or slow cool with a torch

    That being said, after doing all that I would scab a piece of plate over it, for added strength, my experience with cracks is they just keep coming back...
    -Karl
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  3. #3
    Registered User robertf03's Avatar
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    don't scrap it, j-b weld it
    ...

  4. #4
    Rock and Roll AggieTJ2007's Avatar
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    it looks like if you welded a brace or a gusset in there it would help alot
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  5. #5
    sprayin' the house down CheapJeep's Avatar
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    nice crack.
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  6. #6
    wash, rinse, repeat. sasquatch's Avatar
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    i guess mid 90s f-150 frames had some problems. both your frame and seths are cracking. drilling the crack and grinding a small gap or bevel seems like the way to fix it

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  7. #7
    Old school badass Seth's Avatar
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    don't forget tate
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  8. #8
    wash, rinse, repeat. sasquatch's Avatar
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    i didnt know tates is cracked too. that sucks

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  9. #9
    Registered william_ace's Avatar
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    tates is not anymore, thats why he did a frame off. so he could get a new frame...

  10. #10
    fbronco86
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    Quote Originally Posted by KrazyKarl02
    Proper way to fix it, get a new frame

    Pilot hole drilling will stop the crack... To weld it you need to gouge it or grind it till there is no trace of the crack, then weld it. After welding I would stress relieve by letting the metal cool very slowly, maybe some sort of thermal wrap or slow cool with a torch

    That being said, after doing all that I would scab a piece of plate over it, for added strength, my experience with cracks is they just keep coming back...
    really after welding you should probably heat the area up with a torch and let the whole area cool down. I would also ping it with a ballpin hammer to relieve stress.

  11. #11
    Dead or alive... mudtoy67's Avatar
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    What's the deal with stress relieving using the ball-peen hammer? Do I do it when the area is heated or when it's cold? And any special way of doing it or just smack it a bunch of times?

    Karl-I had thought about trying to do a little heat treat like you are talking about, but i'm not sure how I could insulate that part of the frame to slow the cooling.

    Quote Originally Posted by AggieTJ2007
    it looks like if you welded a brace or a gusset in there it would help alot
    I'm planning on boxing the frame. I'm also thinking about making a brace that connects the back of the two radius arms together at the retaining nut.
    BDR

  12. #12
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    Don't worry about this heating and shot peening crap. Just drill little stop holes past where you think the crack ends, grind into the crack, and put a good weld into it. You can preheat if you'd like, that's more improtant than trying to slow the cooling, because by preheating you greatly slow the cooling of the weld because it is not cooled as quickly by the surrounding cold metal. And don't weld it too hot. If you're not comfortable welding it, I'll weld it for you if you turn the truck over.

  13. #13
    Flyin' the Hindenburg 2.0 DRAGOONRANCH's Avatar
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    Kopeki hit on the most important thing of this project. If you are not comfortable weldiing it, get some one that is. It takes better than average skill to get this right. Numerous frames, various pieces of farm equipment, and plenty of structural welding have taught me that you have to do it right. If not, it will crack again, or will pass the stress on elsewhere and start another one. Good luck with it
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  14. #14
    Once was lost... BMFScout's Avatar
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    BDR, I'd let a professional do it...
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  15. #15
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