Author Topic: Question for mechanics and rebuilders  (Read 279 times)

IronHorse

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Question for mechanics and rebuilders
« on: Jan 05, 2022, 08:09:01 pm »
I got my used crank case in I am using to learn and rebuild on and I looked it over everything looks pretty good. I noticed some markings on the ring around the bore where the connection rod looks to have hit against the case( see pictures) I was able to smooth it out by lightly sanding with a folded piece of 1000 then 2000 grit sand paper. My question is does this even matter does it affect anything is it common?
Thanks!

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    Fiddles

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    Re: Question for mechanics and rebuilders
    « Reply #1 on: Jan 06, 2022, 05:49:08 am »
    I would be more worried about the crack I see.
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    IronHorse

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    Re: Question for mechanics and rebuilders
    « Reply #2 on: Jan 06, 2022, 07:47:44 am »
    To the left of my thumb? Thatís the joint where the case halves join.
    Or did I miss something?

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      ROADKILL

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      Re: Question for mechanics and rebuilders
      « Reply #3 on: Jan 06, 2022, 08:45:12 am »
      To the left of my thumb? Thatís the joint where the case halves join.
      Or did I miss something?
      I definitely see a crack right beside your thumb

      Ares X

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      Re: Question for mechanics and rebuilders
      « Reply #4 on: Jan 06, 2022, 09:39:29 am »
      To the left of my thumb? Thatís the joint where the case halves join.
      Or did I miss something?

      Are you sure that's a joint? The two sides don't align to each other.

      ROADKILL

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      Re: Question for mechanics and rebuilders
      « Reply #5 on: Jan 06, 2022, 11:53:34 am »
      To the left of my thumb? Thatís the joint where the case halves join.
      Or did I miss something?

      Are you sure that's a joint? The two sides don't align to each other.
      That's a crack
      « Last Edit: Jan 06, 2022, 11:55:05 am by ROADKILL »

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      Re: Question for mechanics and rebuilders
      « Reply #6 on: Jan 06, 2022, 12:20:40 pm »
      That is a crack and I also would be concerned about it and wouldn't even bother running the bike with that.

      Sorry for bearer of bad news
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      IronHorse

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      Re: Question for mechanics and rebuilders
      « Reply #7 on: Jan 06, 2022, 12:44:32 pm »
      I also noticed the didnít align but opposite of it and on the other piston side they donít line up. I figured the didnít need to  be perfectly lined because the cylinder extends down in to the bore I took another picture showing the case split line up too the area in question. That being said if it is not useable no big deal the value of the parts left in are more than I paid for it overall.
      « Last Edit: Jan 06, 2022, 12:49:15 pm by IronHorse »

      Ares X

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      Re: Question for mechanics and rebuilders
      « Reply #8 on: Jan 06, 2022, 02:45:35 pm »
      I can definitely see why you would think that was a seam.  It does kind of look like it.

      the urban legend

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      Re: Question for mechanics and rebuilders
      « Reply #9 on: Jan 06, 2022, 08:26:09 pm »
      I see a joint. The cylinder sleeve slips inside the bore and a gasket seals it to the top of the crankcase. Only the top part needs to be even.

      I also see what looks like grey silicone sealer. Seems like it's been taken apart before.
      « Last Edit: Jan 06, 2022, 08:31:43 pm by the urban legend »
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      IronHorse

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      Re: Question for mechanics and rebuilders
      « Reply #10 on: Jan 06, 2022, 09:56:19 pm »
      All of the surfaces on the top are even accept the one it is raised less than a hair almost miss it if my nail didnít catch on it. Should I just pull the parts and scrap the case? I was wondering since itís an 08 if it had the third gear replaced before.