Gas Tank Repair

Discussion in 'Motorbike Technical Discussion' started by davebz1a, Jan 2, 2005.

  1. davebz1a

    davebz1a Guest

    I have a 74 Kawasaki Z1 that the gas tank is rusting on the inside. I
    noticed this when winterizing it this year. I usually fill it up to
    the top and add the proper amount of Stable, but seeing the rust this
    year I took the tank off and drained it completely. Does anybody have
    any suggestions on how to treat this tank? Dave
    davebz1a, Jan 2, 2005
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  2. davebz1a

    Diablo Guest

    You can do one of two things...
    1) Coat the inside yourself with a product like Kreem or POR-15 (I use
    POR-15 myself)...You must follow the directions explicitly for it to be
    effective...You first remove as much loose scale as you can by filling the
    tank with aquarium gravel, or a couple of cups of nuts and bolts, and
    shaking the tank vigourously for as long as you can stand it...then rinse
    and dry the tank...then treat the tank with degreaser, and rinse and dry
    again...then acidize the tank, and rinse and dry again...bone dry !!...If
    it's not bone dry, the treatment will not adhere, so you need to circulate
    warm air with a hair dryer, or vacumn cleaner...then treat the tank with
    sealer, and let it cure for at least 72 hours, or to the products

    2) Take it to a radiator repair shop, and have them derust and coat
    it...It's more expensive (about $85.00 US vs $40.00 US), but a lot less
    labor intensive, and if they screw it up, you can make them fix it.
    Diablo, Jan 2, 2005
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  3. Nice bike Dave.

    Simple answers.

    Buy some Milk Stone remover, fill tank let set for a day or
    two. Pour back into original container(reusable) You now
    have a clean tank with a nice protective layer.


    Buy some POR15 and follow the directions. WARNING, using
    either technique MAY show you problems such as pinholes that
    you were unaware of. Yes you can fix those, no I wont tell
    you how. Far better to find a welder or radiator shop
    willing to do the work.

    Keith Schiffner
    "I was just out walking my rat and seem to have got lost."
    J. Bond
    Dum vivimus, vivamus
    <:(3 )3~ <:(3 )3~
    <:(3 )~ <:(3 )~
    Keith Schiffner, Jan 2, 2005
  4. davebz1a

    bowman Guest

    Or phosphoric acid from the Home Depot concrete section, if cows aren't
    popular in your neighborhood.
    bowman, Jan 2, 2005
  5. I just finished a POR-15 treatment and I'm happy with the
    results. About $30.00 and 4 days drying time. If I did it again
    I might spring for some extra phosphoric acid for the cleaning
    and etching step.

    To dry the tank, I clamped a piece of metal tubing on the
    end of a heat gun. This let me blast the tank with hot air
    without destroying the heat gun. I also had a little trouble
    with coating buildup on the tube that the petcock screws into.
    I had to scrape some excess coating away in order to refit the
    petcock. Other than that, things went pretty smoothly just
    following the product directions.
    Rob Kleinschmidt, Jan 2, 2005
  6. davebz1a

    Paul Cassel Guest

    milk stone is the white deposit left by hard water. The same acid which
    removes that will also remove rust.
    Paul Cassel, Jan 2, 2005
  7. davebz1a

    Dave Best Guest

    Thanks for all the advice. I don't want to go too crazy, because I
    don't want to disturb the paint; It's that green metallic with yellow
    stripes. I'll take a good look inside with a mirror and a bright
    Dave Best, Jan 3, 2005
  8. davebz1a

    biker trash Guest

    I agree with the Kreem fix. I have done many tanks with that stuff, and it
    works. If you do it right, it will last for ever. its about $30.00 at the
    bike shops.
    Just make sure you buy a small cork to put in the petcock hole. That way
    you wont fill up the threads. Same with the gas gauge hole if you have one.
    biker trash, Jan 4, 2005
  9. I don't think the POR-15 treatment disturbed any paint, though
    my bike has a finish that in the decorating business might be
    described as "the distressed look".
    Rob Kleinschmidt, Jan 5, 2005
  10. davebz1a

    Diablo Guest

    No harm done to mine
    Diablo, Jan 5, 2005
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