How to fix tiny hole in crankcase cover?

Discussion in 'Motorbike Technical Discussion' started by Guest, Apr 24, 2006.

  1. Guest

    Guest Guest

    I'm hoping I could get some ideas on how to fix a tiny hole I see
    on my bike's crankcase cover. I can't imagine how this came into being
    because all I see is a small rectangular projection that juts out from
    the cover, as if the previous owner tried to push the it out with a
    screwdriver from inside, leaving a *tiny* hole. The result is that I
    would see, during the course of a night, a few drops of oil on the
    garage floor

    I have decided to take the cover out and see for myself what it is
    exactly but, I hope someone who may have had similar damage could
    describe how to fix this hole.

    How about soldering, or spot-welding the hole? Given that the material
    is aluminum, would it work? Since I'm not a welder, is there something
    off the shelf I could use to plug it?

    Thanks.
     
    Guest, Apr 24, 2006
    #1
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  2. What he said. Use that Chemical Metal aluminium powder-based epoxy. You
    have to get the cases utterly, utterly clean for it to stick - I mean,
    any oil at all, and it'll fall off - but it is incredible stuff.
     
    chateau.murray, Apr 24, 2006
    #2
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  3. Guest

    FB Guest

    The entire pressure vessel of the Apollo command module was bonded
    together with 3M 2-part epoxy and the epoxy-to-aluminum bond joints had
    to withstand 11 times the force of gravity on splashdown. So you know
    that stuff is very strong, it ain't Bondo.

    JB Weld is a readily available commercial 2-part epoxy that is
    impervious to gasoline or oil.

    Clean the surface with methyl alcohol, brake cleaner, or carburetor
    cleaner and roughen the surface. Mix the JB Weld so it's dark grey and
    position a heat lamp to help it cure faster. The repair will stay in
    place forever if the parts were properly cleaned and roughened.
     
    FB, Apr 24, 2006
    #3
  4. Guest

    slguy Guest

    Many, many thanks to all.
     
    slguy, Apr 24, 2006
    #4
  5. Guest

    LJ Guest

    JB Weld is impervious to gas and oil and it will do the job. However, be
    cautioned that some chemical additives will compromise the bond. I had
    great luck patching my fuel tank until I used stabil for winter layover. By
    spring the patch was softened to the point of leaking. I cleaned and
    repatched it and it held for years, I just quit using stabil.
     
    LJ, Apr 25, 2006
    #5
  6. How about a machine screw, self locking nut, two washers and an o-ring or
    two?
     
    R. Pierce Butler, Apr 25, 2006
    #6
  7. Guest

    slguy Guest

    For my problem or his? For mine, I don't think it is a good solution
    because
    I don't have a hole that is even noticeable. I'd, therefore, try not to
    make it
    worse than it already is by drilling a hole.
     
    slguy, Apr 25, 2006
    #7
  8. Get the quick weld if in a hurry to ride. If not the regular JB takes up to
    12 to 24 hours to fully cure.
     
    ROBERT MILLER, Apr 26, 2006
    #8
  9. Good reminder.
     
    The Older Gentleman, Apr 26, 2006
    #9
  10. Guest

    Guest Guest

    Just finished patching it up using JB Weld and I'm really, really
    impressed.

    I saved a little money here by buying myself a dremel
    sanding stone "bit" and using it with my electric drill to sand the
    area nicely before and after the operation. I was initially a little
    nervous taking the alternator coil assembly out and working in that
    narrow space, but I was extremely careful not to damage anything.
    The end result is something that my dad would have been proud of I
    must say.
     
    Guest, Apr 27, 2006
    #10
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