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Thread: stihl 031av piston replacement problem

  1. 05-17-2008, 04:09 PM #1
    pops21
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    stihl 031av piston replacement problem

    I have a stihl 031av that has lost compression. The tester says 70 lbs. The head also has 4 fins cracked off. I found a good head but needs a piston. Is it ok to put a new piston in. The reason I am asking is the stihl dealer near me said that the piston and head have to be a matching pair. He also said putting a new piston with a old head is a bad idea. That it will not make good compression. Thanks for the help
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  2. 05-17-2008, 05:55 PM #2
    cjcocn
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    If it is not a good idea, then why do they sell piston and ring sets without the cylinder? I'm sure that I've read of folks on here putting new pistons in their old cylinders. Maybe a quick hone to smoothen the cylinder, IIRC.

    .... I partly wanted to say that because I am probably going to do the same thing to my MS290, and I also wanted to subscribe to this thread so that I can receive a notification when someone posts up an answer ('cause I want that answer too!).
    Quote Originally Posted by Art Vandelay View Post
    If it was water gravity would have carried the it down to the river smart guy.
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    You posted a link to yourself there, genius.
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    To late to cry fer help, The banjo music has started.
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    ..... Not much going on here....... I've now got whatever my son has had all week. Probably be laying on the couch with a box of tissues all weekend.....
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  3. 05-17-2008, 06:01 PM #3
    Jacob J.
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    I've only put new pistons in used cylinders on about 850 machines or so in the nearly 20 years I've been working on OPE. So yah, it's possible.
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  4. 05-17-2008, 06:02 PM #4
    Fish
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    People trying to sell you parts may tell you almost anything.

    When replacing the piston and not the cylinder, you must make dam sure you have buffed off all of the pasted on metal, and that you have found out what toasted the old piston as well...................
    @$$#O!E
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  5. 05-17-2008, 06:21 PM #5
    Lakeside53
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    your dealer is an idiot.
    Any sufficiently advanced technology is indistinguishable from magic."
    --Arthur C. Clarke,
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  6. 05-17-2008, 06:46 PM #6
    Fish
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    well............................

    I was trying to be tactful about it
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  7. 05-17-2008, 09:39 PM #7
    pops21
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    I was about 99% sure he was bs ing me. Will this piston kit off ebay work?

    http://cgi.ebay.com/031-Stihl-Chains...2em118Q2el1247
    or
    http://cgi.ebay.com/LOOK-NEW-031-STI...2em118Q2el1247

    I know its not a "stihl" piston but its labled on ebay for a stihl 031av. Anyone have any knowledge of these pistons?

    It would be cheaper just to buy rings and stick the old piston with new rings in the cylinder that I might buy, but would it be safer to get the new piston with rings and go that route. The piston thats in it now has super light score marksm I mean soooo light your finger nail doesn't get cought in them. What I would save from just putting new rings in I could get a carb rebuild kit too boot. Oh man choices choices.
    Last edited by pops21; 05-17-2008 at 09:52 PM.
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  8. 05-18-2008, 09:10 AM #8
    pops21
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    I just remembered. My instructors at motorcycle mechanics institute told me that it is not a good idea to put a used piston in another cylinder because it took the shape of the first cylinder. They said it could cause piston slap in the future. Now if its going back in the same cylinder it would be fine. Just make sure its the same direction going in as it was comming out.
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  9. 05-18-2008, 09:32 AM #9
    epicklein22
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    I have a stihl 031 piston and cylinder I could sell you. I wasn't the one who tore it down but everything looks good. The crank is included too but I don't think you will need that, it would be too much of a hassle to split the crankcase anyway. Let me know if you are interested. If you decide not to go that route, you could either try and smooth out your original piston and cylinder and run it a little bit more or you could buy a piston kit.
    ~Andrew~
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  10. 05-18-2008, 02:41 PM #10
    pops21
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    Sorry epic I already bought a cylinder and piston for 30$ shipped to my house.
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  11. 05-18-2008, 02:42 PM #11
    epicklein22
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    No problem, hope everything works out.
    ~Andrew~
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  12. 05-18-2008, 02:44 PM #12
    Fish
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    Quote Originally Posted by pops21 View Post
    Sorry epic I already bought a cylinder and piston for 30$ shipped to my house.
    But were they made for each other???****
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  13. 05-18-2008, 02:45 PM #13
    epicklein22
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    Yup, came from the same saw. It was torn down because it was leaking oil.
    ~Andrew~
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  14. 05-18-2008, 07:45 PM #14
    Lakeside53
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    Quote Originally Posted by Fish View Post
    But were they made for each other???****
    Any sufficiently advanced technology is indistinguishable from magic."
    --Arthur C. Clarke,
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  15. 05-18-2008, 08:07 PM #15
    epicklein22
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    Quote Originally Posted by Fish View Post
    But were they made for each other???****
    Good question, I know mine came from the same saw. You might want to check that out pops.
    ~Andrew~
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