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  1. #1
    mr. happyfunbear tenjuna's Avatar
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    HELP: Crankcase Gasket Removal

    I have spent the last few hours trying to clean up my 650 crankcase for rebuild, and I am having some trouble.

    whoever rebuilt the engine last used some kind of black rubbery material to seal the crankcase, and I am having some trouble removing it.

    I am using gasket remover and elbow grease and it is slow going...is there something else I could be doing or do I just need to keep going until done?

    I am not a very patient person, though it is getting cleaned I am not sure how "pristine" it should be.


  2. #2
    bowsniper's Avatar
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    Try a razor blade or a wire wheel on a drill! You could even get it hot with a torch a tad and it will come off a lot easier. wear gloves!. Just be careful not to gouge the aluminum.

  3. #3
    A stiff putty knife. I don't like using razor blades on aluminum as it gouges too easy. If you have air, invest in an pnumatic angle grinder and rotary pads, just use a fine pad (a 3m purple is what I use on aluminum, brown on cast). As Bowsniper suggested a little heat as you have no idea what was used (nor do I if you say it is black) as the factory Polaris compound is grey, 515 is purple, yamabond (or equivilent) is grey. Silicon is any color, but not hard to get off. Just my two cents, but I'm sure some will have other ideas.

  4. #4
    mr. happyfunbear tenjuna's Avatar
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    right now I am using plastic razor blades and elbow grease...it took me about 4 hours to get 1 half clean, and it still has plenty of that black goop on it.

    I have a small pen torch so I will give that a shot...otherwise I will try the angle grinder once I can buy it next weekend...thanks.

  5. #5
    thester71's Avatar
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    How about paint thinner, or gas, or paint stripper?Is it hard or soft?

  6. #6
    3M makes some rotary scratchy pads of various corseness(fine-med-rough) (Also some Chineese knock-offs are available)that fit in an air powered die grinder.

    Works great. You can make it like new without removing any metal.

    Cases can't leak when you re-assemble them, other wise they will suck air---not good !!!

    Cheers !

  7. #7
    Lake Mead Bum & BTLS Mark starflight's Avatar
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    Fortunately for me, the oe sealer came off easily, but i wouldn't use any wire wheels, or grinders. You will run the risk of damaging the mating surfaces and cause leaks. I would personally keep doing what you are doing with a plastic scraper/putty knife and elbow grease. You can try to heat the material to make it harden, and may come off easier.
    Can we see pics of what you are dealing with?

  8. #8
    Canadian Beaver Inspector jkindt's Avatar
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    One word... Brake Cleaner!

  9. #9
    Lake Mead Bum & BTLS Mark starflight's Avatar
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    Quote Originally Posted by jkindt View Post
    One word... Brake Cleaner!
    But that's 2 words.

  10. #10
    thester71's Avatar
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    Quote Originally Posted by jkindt View Post
    One word... Brake Cleaner!
    J are you sure that is only one word

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