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piston scoring, pollishing?

Discussion in 'Chainsaw' started by plinker, Mar 10, 2008.

  1. plinker

    plinker ArboristSite Lurker

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    I have a Stihl 028 aveq piston that has some scoring on the intake side. It dosent look real bad (no scoring in the bore as far as I can tell) th skirt gap is .0025" measured with a feeler gauge.

    What grit sandpaper or ? should I use to pollish it smooth so it dosent deposit aluminum in the bore? I can get 40 grit to 1500 grit paper.

    It would probably be ok, but I'd feel better if it was smoothed a little, as is it is not that rough to the touch(feels smooth).

    Thanks
     
  2. Ray Bennett

    Ray Bennett AboristSite Guru

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    Im no expert but I use fine grit emory cloth on the jug, If the piston is scored get a new one, After market one is around 30 bucks, No use trying to save it in my opinion.
     
  3. Mad Professor

    Mad Professor Addicted to ArboristSite

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    You will leave some grit (aluminum oxide) in the soft aluminum of the piston, your cylinder will not like that................
     
  4. joesawer

    joesawer Addicted to ArboristSite

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    The piston is your valves on the engine. The skirt seal on the intake side has a big influence on how the saw runs.
    My vote is for a new piston also.
     
  5. stevethekiwi

    stevethekiwi Addicted to ArboristSite

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    also ask youself why the scoring is there in the first place - otherwise you will root a new piston

    possibly have a hole in your air filter...
     
    joesawer likes this.
  6. Lakeside53

    Lakeside53 Stihl Wrenching

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    The use of "root" is not well understood over here.. I've had to stop using it... and the joke that "A Kiwi eats roots and leaves...." well... I just get blank stares.:greenchainsaw:
     
    Last edited: Mar 10, 2008
  7. stevethekiwi

    stevethekiwi Addicted to ArboristSite

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    lol i laughed so much i wee'd a bit
     
  8. Lakeside53

    Lakeside53 Stihl Wrenching

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    ..more blank stares from the peanut gallery:givebeer:
     
  9. stevethekiwi

    stevethekiwi Addicted to ArboristSite

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    sigh...

    so where are the photos of this scored piston buddy, give lake something to critique :)
     
  10. andrethegiant70

    andrethegiant70 Addicted to ArboristSite

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    Ya, if you go through all the trouble of taking that thing all the way down and just skritch at the piston a bit, you'll feel like a loser and you'll not do your nice saw justice. Given the effort, the esteemed Ray Bennet is correct, put a new piston in it.

    Be advised, the 028 has gone through some bore diameter changes. I'd measure the old piston prior to ordering up another one. Oh, and another poster had a great point (the fellow who used "root" as a verb)... you might want to think about how the piston got scored in the first place.
     
  11. plinker

    plinker ArboristSite Lurker

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    I have a educated guess on what happend.

    I took the carb off because it wasnt running the best and I took the diaphram cover of and on the screen was a some wood particles (I figure it was running lean, not enough fuel).
    So I cleaned the diaphram screen & reassembled, it started flooding.

    Took the carb to the local dealer & got it rebuilt also picked up a gas filter & a couple of gaskets.

    I run 32:1 mix, fwiw.

    I looked down the carb boot & noticed the scoring, so I took the cylander off.

    I'll probably get this piston (the saw has a 44mm piston)
    http://www.amickssuperstore.com/Meteor_Piston_1143_p/meteor%201143%20piston.htm

    I'll work on getting some pic's soon as I get a chance.

    When I went to the dealers to pick up my parts they had a real clean 028 super for $175...it followed me home:biggrinbounce2:
    I put a tank of gas through it never missed a beat.
     
  12. plinker

    plinker ArboristSite Lurker

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    Last edited: Mar 11, 2008
  13. Ray Bennett

    Ray Bennett AboristSite Guru

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    well thanks ANDRE THE GIANT, tried to rep ya but I need to spread the wealth. One question, Is esteemed a good or bad thing?:hmm3grin2orange: :hmm3grin2orange: :hmm3grin2orange:
     

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