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Cylinder retorque ?

Discussion in 'Chainsaw' started by Huskybill, Nov 9, 2019 at 10:03 PM.

  1. Huskybill

    Huskybill Addicted to ArboristSite

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    After your rebuild is done, and she has a few hours on it does anyone retorque the cylinder? On the two stroke bikes we retorque the cylinders after a few starts and letting them heat up? The cylinder base gasket could leak if the torque isn’t where it should be. This retorque makes sense to me. Why did my am cylinder kit fail? I’m thinking pre lube and air leak down test wasn’t done and a retorque.

    On car engines I went 10# past the torque specs and it was close to spec during the retorque check.
     
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  2. Andyshine77

    Andyshine77 Tree Freak

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    I like to check after a run or two, Stihl used to recommend this in the owners manual of their pro saws. If I use Hondabond I don't bother checking, it holds things tight as a drum.
     
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  3. buzz sawyer

    buzz sawyer Addicted to ArboristSite

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    Good point, but I've never done it. I wonder any OEMs do this in their manufacturing process?
     
  4. Matt93eg

    Matt93eg ArboristSite Operative

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    If I have the top cover off my saws that are not a clamshell cleaning and what not I will check them while the cover is off. Never know even if it’s not a recent rebuild when a bolt could start coming loose. Probably not likely but only takes couple seconds to check them.
     
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  5. blsnelling

    blsnelling Site Contributor

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    I never have.
     
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  6. Gord404

    Gord404 ArboristSite Operative

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    I do it every time if I can after the first real heat up and let it cool down - cylinder and muffler both get attention and yes I had a few experiences a while back to think this is a good idea for the little time it takes.
     
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  7. Tobystihl

    Tobystihl Creaky Limb Tree Care

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    After a rebuild and a few heat cycles, I check the cylinder bolts with the torque wrench, never have they altered from the initial torquing. (It's purely done for peace of mind!)
     
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  8. Brent Nowell

    Brent Nowell ArboristSite Guru

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    Could depend on the gasket used for the cylinder, some may shrink slightly when they have gone through a few heat cycles?

    Snelling says he never does, he probably does a lot of rebuilds, so probably a non issue.
    Brad what do you torque the head bolts to?
     
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  9. burnses

    burnses ArboristSite Guru

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    I ck the muffler on a husky more often than other saws. after a build and some hard running ill put a t handle on the cylinder bolts. I don't think I have ever used a torque wrench on a saw cylinder....I did recently have to drill the allen heads off a jonsereds 450 cylinder bolts to get the cylinder off that was a first....not sure what I did to the font....

    the can



     
  10. Duce

    Duce Addicted to ArboristSite

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    Use blue loctite on case, cylinder, oil pump and muffler bolts. Let it set up and forget it.
     
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  11. Huskybill

    Huskybill Addicted to ArboristSite

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    Maybe some don’t torque the cylinder in the beginning?

    I just took apart a 162 SE and the case bolts were snug not tight like they should be.
     
  12. SEAM

    SEAM Addicted to ArboristSite

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    I believe gasket material will shrink as it gets brittle. I had a few Dolmars (133) and also a 5-year old Husqvarna (550XP) with pieces of broken gasket sticking out between the oil tank fitting surfaces... Might have been the oil they used, though.
     
  13. farmguywithasaw

    farmguywithasaw ArboristSite Operative

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    Torqued the head on a cat 9.3 acert engine in school 150 ftlbs + 90 degrees. Once finished back them off and redo there was a lot of head bolts too worked up a sweat
     

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