Problems seperating log and riser.
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Problems seperating log and riser.

  1. #1
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    Default Problems seperating log and riser.

    Had no problem getting the bolts off but now cant get the flange apart. We havnt tried heat yet but wondering if anyone has any other ideas that may work?

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    Boat Nut sleekcrafter's Avatar
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    Have had that problem before, nothing short of a big press would have pulled them apart it would have seemed. I finally hack sawed the studs, and had to eventually saw the entire gasket out. I had the remainder of the stud extracted,and the mating surfaces machined. Installed new stainless studs, washers, nuts, and gasket, and never looked back.
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    Senior Member jetboatperformance's Avatar
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    Quote Originally Posted by sleekcrafter View Post
    Have had that problem before, nothing short of a big press would have pulled them apart it would have seemed. I finally hack sawed the studs, and had to eventually saw the entire gasket out. I had the remainder of the stud extracted,and the mating surfaces machined. Installed new stainless studs, washers, nuts, and gasket, and never looked back.
    X's 2 (above) unfortunatley more often than not these have been assembled with dissimilar metals (iron studs vs aluminum manifolds and rizer ) and they are litterally "grown together" from corrosion Might just have to get out the sazall , heat wont likly help you might try the scret mixture of acetone and ATF , read this here on the boards and recently used it as aluminum penetrant with good success Tom

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    Quote Originally Posted by jetboatperformance View Post
    X's 2 (above) unfortunatley more often than not these have been assembled with dissimilar metals (iron studs vs aluminum manifolds and rizer ) and they are litterally "grown together" from corrosion Might just have to get out the sazall , heat wont likly help you might try the scret mixture of acetone and ATF , read this here on the boards and recently used it as aluminum penetrant with good success Tom

    May have to try that mixture, soaking it in kroil oil now have had good luck with it in the past.

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    tintingsandiego krusn56's Avatar
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    I have taken several apart with great luck...not breaking one stud so far. Use penatrating oil...soak, soak, soak....give in a day or so. Take a few steel putty spreaders and start tapping the gasket in and then resoak with the oil. Be patient....you will eventually get all the gasket removed. With nothing but the studs holding them together tap on that area with a rubber mallet. Take your spreaders and start adding two or three together to move the snail from the studs. Do this in between all the studs with constant soaking of the oil and it will break free.....take your time!
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    Quote Originally Posted by krusn56 View Post
    I have taken several apart with great luck...not breaking one stud so far. Use penatrating oil...soak, soak, soak....give in a day or so. Take a few steel putty spreaders and start tapping the gasket in and then resoak with the oil. Be patient....you will eventually get all the gasket removed. With nothing but the studs holding them together tap on that area with a rubber mallet. Take your spreaders and start adding two or three together to move the snail from the studs. Do this in between all the studs with constant soaking of the oil and it will break free.....take your time!

    Will definitely give that a try.

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    Was wondering in case i do break a stud how much it would tear up the aluminum to plug weld a nut to the broken of portion to try and back it out. I used to do this with cast qd bushings with great success but never tried it on aluminum.

  10. #8
    Horsepower sells Engines lefty's pride's Avatar
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    i never got temp out either just ended up giving up on it hack sawed thought very carefully my gasket was very thick thou. sent the log out to the machine shop never had good luck drilling studs out
    "Horsepower sells Engines but torque wins races."
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    tintingsandiego krusn56's Avatar
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    Quote Originally Posted by cjaj70 View Post
    Was wondering in case i do break a stud how much it would tear up the aluminum to plug weld a nut to the broken of portion to try and back it out. I used to do this with cast qd bushings with great success but never tried it on aluminum.
    Give yourself plenty of time to do this....they will break free. Treat them as some sort of artifact. Once you have the gasket pushed in...tap a couple steel spreaders in and all around each stud. Keep spraying your penatrating oil on it. They will start to teader and will break free...patience(like tryin to get some broad off). Just keep working at it.
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