Can this be saved?
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    Can this be saved?

    I have a threaded screw boss that is broken on a small engine. I guess the metal is cast aluminum. Should I use J-B Weld product called Steel-Stik for the repair? It is a mold able epoxy that can be drilled and tapped. I have not use this product before. Will it hold if cleaned properly?
    Any suggestions?
    Thanks

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    Attached Thumbnails Attached Thumbnails two cycle eng. (2).jpg   screw brealkout  1 (2).jpg   screw breakout 2 (2).jpg   Steelstik (4).jpg  
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    Keeper of the GTT Cookies dieselshadow's Avatar
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    It's worth a shot. Looks like a very small 2 stroke engine. Those cases can be very difficult at best to weld due to it being cast aluminum. If your JB Weld doesn't work, you may have to get a new case half if it's even available.

    What are we working on?
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    Senior GTT Super Slacker Gizmo2's Avatar
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    How much pressure is on the bolt?
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    Captain Hook Kennyd's Avatar
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    How much pressure is on the screw/boss? In other words what’s it holding?
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    Fozsey's Avatar
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    My knee jerk thought by looking at the damage and assuming its of value to you is to jb the piece and helicoil it to preserve the threads .
    Last edited by Fozsey; 12-24-2017 at 02:43 PM.
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    Use the JB Weld. Then if possible, put a small hose clamp around the post to strengthen it.
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    Captain Hook Kennyd's Avatar
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    Quote Originally Posted by ChrisR View Post
    Use the JB Weld. Then if possible, put a small hose clamp around the post to strengthen it.
    Or wrap a steel wire around it several times a smear with more JBW.
    Kenny

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    I'd use a Time-Sert https://www.amazon.com/Time-Sert-M8x.../dp/B01MSPN7NH of the correct size or one above, then the aforementioned hose clamp mold method to build up the lost side in JB Weld.

    If that didn't work I'd build it all back up with TIG beads, but it had better be worth the time and effort at that point.

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    Wow, you folks are the best.
    Yes, this is a two cycle engine from a McCulloch Mini-Mac 25 chain saw.
    I know this is not a tractor, but I also think a lot of you guys wrench on other machinery.

    That broken tapped boss is one of the three locations on the engine that holds the engine to the outside casing. This location is the very bottom of the saw.
    I don't know if the saw was dropped and caused this to happen. Casing is fine. Or if someone was over zealous in the tightening of the screw. I do not believe it has to hold a lot of pressure.
    Option 1 Clean and replace broken section along with filling tapped cavity and re tapping for screw.
    Or
    Option 2 Leave small broken piece aside, do not use. Fill tapped cavity and build a new side wall for screw, using the epoxy, and then re tap.

    Note to self. Make sure I have a bottom tap.

    Regards
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    GentlemanFarmer's Avatar
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    Clean it VERY GOOD

    Cast aluminum is notorious for oils seeping into the pores of the metal, a way I use to clean it is take a propane torch and heat the bolt boss just until you see the oil start to come from the metal ( doesn't have to get extremely hot) and clean it quickly with a NON-FLAMMABLE cleaner the best that you can- you can never get it all. This will help the epoxy stick better, and when you put the epoxy on make sure not to leave any cavities in it completely fill it - don't try to save the current hole. Then drill and tap the new hole. The idea of putting a clamp or thick steel wire around it is good also to give it more strength. I have made a lot of repairs this way and had very good success. I hope this helps and good luck with your repair.

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