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Blued Kohler

Discussion in 'Mechanic and Repair' started by JStarnes, Jun 12, 2004.

  1. JStarnes

    JStarnes LawnSite Member
    Messages: 8

    Just got my Kohler CH20S back from the machine shop and was trying to clean the block up a little. After using the recommended oven cleaner I find that the engine is this brilliant blue color (oxidation I guess)

    Is their anything I could use to get the engine back to normal.
    The color is OK, I really don't see anyone seeing it, but I would like to know for future reference. :confused:
  2. vipermanz

    vipermanz LawnSite Bronze Member
    Messages: 1,773

    now i would love to see a pic of that., try a scotchbrite wheel in a drill, you will have to repaint or refinsh it though.
  3. Richard Martin

    Richard Martin LawnSite Fanatic
    Messages: 14,699

    When I saw the title of this thread I thought it was some hick way of saying that you had blown up your Kohler engine. He-yuck!
  4. fixer67

    fixer67 LawnSite Silver Member
    Messages: 2,098

    Blued is right. You used oven cleaner on an aluminum block and there was a chemical reaction just like using gun blue-ing. Nothing will remove it. You will have to scrap off the top layer of metal to remove the coloring. I know a man who used a drain cleaner in a stainless steel kitchen sink and truned it blue. He could not remove the coloring so he just got more drain cleaner and a rag and made the whole thing match. You said recommended oven cleaner , recommended by who? I just went to the store room and checked a can of EASY-OFF oven cleaner which has sodium hydroxide (LYE) and it clearly says on the can do not use on aluminum.
  5. JStarnes

    JStarnes LawnSite Member
    Messages: 8

    After great consideration the Blue color is starting to grow on me, I think I will leave it, after all when I shut the cover you can't see it anyway. I thought about buffing to a nice chrome finish but it's going on a lawn mower not a show car.

    The machine shop recommended the oven cleaner.
    Maybe I should read the can next time.


    PS. I did blued it up thats why I'M a re-buld-N it
  6. xcopterdoc

    xcopterdoc LawnSite Senior Member
    Messages: 752

    sodium hydoxide and aluminum dont go together very well... let us know what happens a few months from now..
  7. JStarnes

    JStarnes LawnSite Member
    Messages: 8

    xcopterdoc, what do you think will happen in the next few months?

    I have cleaned the block inside and out with soap and water, is their anything else you would suggest ????????????

    I think the only thing harmed is the external finish which doesn't really bother me.
  8. Liquid Cooled

    Liquid Cooled LawnSite Member
    Messages: 10

    What I use on aluminum and stainless steel is phosphoric acid (PO4). You have to use rubber gloves and goggles, don't take a chance. This will remove oxidation, corrosion and rust. It will not remove grease or oil.

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