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  1. #21
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    Went to clean the cylinders today, used warm soapy water followed by air compressor and oil in the cylinders. First one went fine, second one covered in flash rust. Most of it was on the outside but a few spots in the cylinder walls. What's the best way to clean this up?

  2. #22
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    WD-40 on a rag for the cylinder walls. Just paint over the flash on the outside, no big deal.

    Jim

  3. #23
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    Quote Originally Posted by JBinNC View Post
    WD-40 on a rag for the cylinder walls. Just paint over the flash on the outside, no big deal.

    Jim
    Cool, thanks. Here is what it looks like. This is after WD-40 and rag on the cylinder walls.

    Click image for larger version. 

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  4. #24
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    Looks like you have some rust PITTING in the bore. That does not happen overnight. These cylinders were bored to a larger oversize than the old pistons were?

    Jim

  5. #25
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    Yes, .010 over previous bore to .060 over currently

  6. #26
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    Quote Originally Posted by Akamm47 View Post
    Yes, .010 over previous bore to .060 over currently
    Do you think that pitting was there in the previous bore?

    Jim

  7. #27
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    There was pitting on the previous bore, the guy that did the work thought .010 would be enough, plus would leave another .010 left for the future. Guessing that is what the pitting is from, no way it would be that bad from flash like you mentioned.

    Now the question is, what to do next?

  8. #28
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    I would not mind running it. It's just unusual to see pitting that deep in a running motor. A .010 overbore will almost always take care of it.

    Run it.

    Jim

  9. #29
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    Interesting. Thanks for the help.

    Ended up rubbing down the outside with some wd40 and steel wool to clean up a bit. Click image for larger version. 

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  10. #30
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    Quote Originally Posted by Akamm47 View Post
    Interesting. Thanks for the help.

    Ended up rubbing down the outside with some wd40 and steel wool to clean up a bit. Click image for larger version. 

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    Now you are going to have to wash it down with lacquer thinner or something so paint will stick to it.WD-40 is NOT a good prep for paint. That was for the bore, where you don't want any paint.

    Jim

  11. #31
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    Yep, did that too. Then re cleaned with soap and water, oiled up the bore, tapped and ready to paint.

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