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head job or welding hairline top-end crack?

Discussion in 'XJ Technical Chat' started by sektorgaz, Apr 21, 2014.

  1. sektorgaz

    sektorgaz Member

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    subject. not too bad.. but sprays on my right leg slightly :)

    ebay says like 60$ for the valves too -included.. so discuss?
     
    sektorgaz, Apr 21, 2014
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  2. sektorgaz

    sektorgaz Member

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    what should i do boys?
     
    sektorgaz, Apr 21, 2014
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  3. Thrasher

    Thrasher Member

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    Photo would be nice. I fixed a crack in my case with JB Weld, I have had no issues at all.
     
    Thrasher, Apr 21, 2014
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  4. sektorgaz

    sektorgaz Member

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    Alright.. Will do.

    But to be honest -- i tried all kinds of soft treatments.. Even a torch gun..

    The problem is - the break is right under the valve cover and pulls air and spits oil.. Need to seal it - once and for all.. Thinking a top-end replacement is the smart thing to do by myself, unless I can find a professional to fix it..

    The cause - overtightening valve cover bolts.. Anyway..
     
    sektorgaz, Apr 21, 2014
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  5. Bigshankhank

    Bigshankhank Active Member

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    I just bought a complete replacement head w/cams for my 700 for $60, why bother fixing the one you have?
     
    Bigshankhank, Apr 22, 2014
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  6. sektorgaz

    sektorgaz Member

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    That's what I'm thinking too..
     
    sektorgaz, Apr 22, 2014
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  7. Gunbunny

    Gunbunny Member

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    It really depends on how long the crack goes on for.

    If it's just a tiny little split, I'd say drill out the end of the crack, braze it up, drill, & re-tap the hole.

    Worst case scenario, you're out of a couple hours of your time, and all of the $10 it would take to buy a pack of brazing rod.
     
    Gunbunny, Apr 22, 2014
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  8. TIMEtoRIDE

    TIMEtoRIDE Active Member

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    Get the area really, REALLY clean with carb cleaner,
    smear clear silicone into the crack by rubbing it with your finger.
    clean off the mess, then lay a neat little bead on the crack.
    a couple days later make it disappear with a touch of silver paint (or black)

    Drilling the end of the crack is a good idea.
     
    TIMEtoRIDE, Apr 23, 2014
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  9. Gunbunny

    Gunbunny Member

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    I'm not sure if clear silicone is really going to hold up to heat & pressure. OP said he was feeling stuff sprayed onto his leg.
     
    Gunbunny, Apr 23, 2014
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  10. sektorgaz

    sektorgaz Member

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    yeah it goes straight down for about 4cm = 2 inch or something like that..
     
    sektorgaz, Apr 23, 2014
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  11. Orange-n-Black

    Orange-n-Black Well-Known Member

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    Drill small hole at end of crack and braze it or use silver solder(it's stronger).
     
    Orange-n-Black, Apr 23, 2014
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  12. sektorgaz

    sektorgaz Member

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    i wish i had titanium Lol^ shadow_boxers ;-)
     
    sektorgaz, Apr 24, 2014
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  13. Gunbunny

    Gunbunny Member

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    titanium is a pain in the ass to work with any way you go about it.
     
    Gunbunny, Apr 24, 2014
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  14. sektorgaz

    sektorgaz Member

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    Sad but true.. Will see what I can do...
     
    sektorgaz, Apr 24, 2014
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  15. Gunbunny

    Gunbunny Member

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    Pull the head, and if you know someone that knows how to braze, they'll be able to take care of you. Aluminum is a pain in the ASS to weld, so that's why I recommended a bronze braze to fix your crack.

    Clean it up, flux it super well, heat thoroughly, and let the braze rod flow on down. ;)
     
    Gunbunny, Apr 24, 2014
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  16. sektorgaz

    sektorgaz Member

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    Wow.. Sounds like the plan-b.. 10-4
     
    sektorgaz, Apr 24, 2014
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