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what gasket material for cylinder base?

Discussion in 'Chainsaw' started by wsg, May 16, 2011.

  1. wsg

    wsg ArboristSite Operative

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    Looking to adjust my compression on the 372. What materials are good gasket replacements? I searched a little and saw: aluminum can gaskets, And i beleive manila folder gaskets?

    Just wondering what was reccomended from the builders here.

    Thanks!
     
  2. JustinM

    JustinM Addicted to ArboristSite

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    I believe the manilla folder paper is the most popular around here. I am always chicken with this stuff (and dont ever mod things beyond a simple muffler mod anyway) so I usually just stick to the $5 or $10 gasket kits for the specific saw Im working on.

    You could always just get the "real" gasket sheets too..although I think some people consider that cheating :p
     
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  3. Roanoker494

    Roanoker494 Addicted to ArboristSite

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    Get a sheet of 1/64" fiber/rubber gasket material from a local auto parts store, comes in a 10"x26" roll for around $5.

    EDIT:
    I have seen Grandpa make valve cover and oil pan gaskets out of a corn flakes box.
     
    Last edited: May 16, 2011
  4. mdavlee

    mdavlee Tree Freak

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    If it's like the last few 372s I've messed with a little sealer is all you need. The squish will still be above .020" without a gasket.
     
  5. Stihl-Pioneer

    Stihl-Pioneer Addicted to ArboristSite

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    Permatex 518 should work ok for what you want to do.
     
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  6. Brian13

    Brian13 Addicted to ArboristSite

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    Soda can will work too.
     
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  7. komatsuvarna

    komatsuvarna Arboristsite MVP

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    I agree. If no machining has been done it should be well above .020, but you need to be sure.
     
  8. woodgrenade

    woodgrenade ArboristSite Guru

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  9. nmurph

    nmurph ArboristSite.com Sponsor

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    Yamabond 4 if nothing is needed.

    Aluminum cans are good for .003-.004

    Gasket material in the thickness you need.

    Yes, many have used manilla paper coated with gasket shellac or a Permatex spray gasket maker.
     
  10. Brian VT

    Brian VT Addicted to ArboristSite

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    Yup. You shouldn't assume that you can use a thinner gasket.
    Check the squish and that will tell you what thickness your gasket, if needed, should be.
     
  11. 67L36Driver

    67L36Driver Addicted to ArboristSite

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    +2 Just some gasket cement on the few I've done.

    I check squish with rectangular toothpicks. 'Glue' three or four lengths to the top of the piston with bearing grease and roll the crank thru a cycle holding the cylinder in place by hand.
     
  12. Brian VT

    Brian VT Addicted to ArboristSite

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    They're not too springy ? I wouldn't think they'd give a very accurate reading. I was told to use rosin core electrical solder from Radio Shack, fwiw.
     
  13. motoman.5150

    motoman.5150 ArboristSite Operative

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    nothing at all metal to metal have only come across 1 that leaked a little my 2171 has nothing in it, been that way for a long time and no trouble it also has over 180 lbs. compression
     

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