In loving memory of Kenis D. Keathley 6/4/81 - 3/27/22 Loving father, husband, brother, friend and firewood hoarder Rest in peace, Dexterday

Piston and Piston Stop Questions

Discussion in 'Chainsaws and Power Equipment' started by Certified106, Mar 9, 2015.

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  1. Certified106

    Certified106

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    Ok, working cleaning up a saw for a friend and have a couple of questions so I figured I would just start a thread and keep posting to it. A friend of mine was haveing trouble with his Husqvarna and was just going to replace it. Anyhow I figured I would try my hand at going through the saw and if I could fix it great if not he doesn't care.

    The main problem was it has been chewing up chains long story short I need to replace the rim sprocket as it is shot! I will post pictures of it later. Do you all recommend just putting rope in through the spark plug hole as the piston stop or is there a better way of doing it?

    Also I am going to post some pictures of the piston below. The saw seems to run fine and the compression was between 160-170 during multiple tests however the piston has what I think some carbon buildup on it? both the piston and the cylinder look great with no signs of scoring and you can still see the machining marks anyhow take a look and let me know what you think. Thanks
     
    Certified106, Mar 9, 2015
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  2. Certified106

    Certified106

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    20150307_194610.jpg 20150307_194507.jpg 20150307_194402.jpg
     
    Certified106, Mar 9, 2015
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  3. Shawn Curry

    Shawn Curry

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    I didn't have any rope that would fit down the hole, when I took the clutch off one of my Husky's to replace the rim sprocket. I used some 14 gauge romex wire instead. No idea on the carbon.
     
    Shawn Curry, Mar 9, 2015
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  4. Certified106

    Certified106

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    Thanks, I have used the rope before but just didn't know if there was a more acceptable way of doing it.
     
    Certified106, Mar 9, 2015
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  5. cnice_37

    cnice_37

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    Rope works fine, just feed it when the piston is above the exhaust port and on its way up.

    Can't help with the carbon... can you pressure/ vac test it?
     
    cnice_37, Mar 9, 2015
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  6. MasterMech

    MasterMech The Mechanical Moderator

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    Rope is a fine method, just be careful you don't get it in The exhaust or transfer ports (higher than the exhaust they are) or else you will have a heck of a mess trying to get it back out.

    Dang outboard clutches!
     
    MasterMech, Mar 9, 2015
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  7. cnice_37

    cnice_37

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    :p
     
    cnice_37, Mar 9, 2015
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  8. Certified106

    Certified106

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    Yeah I have always made sure it couldn't get out of the exhaust port as I bet that would be a mess.

    What did you think of that piston? You think it might be some blow by past the ring? The compression looked good though.
     
    Certified106, Mar 9, 2015
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  9. Certified106

    Certified106

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    Check out how bad this is
    20150309_165917.jpg
     
    Certified106, Mar 9, 2015
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  10. prell 73

    prell 73

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    damm that's nasty
     
    prell 73, Mar 9, 2015
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  11. FredRed

    FredRed

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    No worries, that will buff out :hair:
     
    FredRed, Mar 9, 2015
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  12. MasterMech

    MasterMech The Mechanical Moderator

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    Piston looked fine. The discoloration is from the oil. Usually a combination of a non-synthetic and a good amount of heat. I'm guessing the chain was less than razor sharp? ;). It won't hurt to run it as is.
     
    MasterMech, Mar 9, 2015
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  13. DexterDay

    DexterDay Administrator

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    Agreed. .

    I've seen new saws with pistons that have a portion of black skirt.

    As for spinning the clutch off? I took the advice of others here and just used an impact to spin off the clutch. Leave the spark plug in and use the compression of the saw to stop the piston. Rope is what I used in the past. As stated above, make sure you are above the exhaust port before you shove it in.
     
    DexterDay, Mar 9, 2015
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  14. DexterDay

    DexterDay Administrator

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    Ouch... That is pretty bad!!

    What model Husq?
     
    DexterDay, Mar 9, 2015
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  15. Certified106

    Certified106

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    It is just a ~10 year old 455 rancher. When I started pulling everything apart it was pretty bad as far as dirty. You could scrape the junk off the air filter it was so plugged. He said he has never done a thing with it in about 10 years other than fuel and bar oil and it cuts 5-6 cords a year.
     
    Certified106, Mar 9, 2015
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  16. Certified106

    Certified106

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    Just needs a bit of elbow grease right.:rofl: :lol:
     
    Certified106, Mar 9, 2015
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  17. angelo c

    angelo c

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    Some Huskys don't have the nut you can impact on to. you have to "smack it off" with a screw driver( opposite direction of course CCW) there is a mark on the clutch showing you where. I think there is a tool you can purchase/make from a socket that will allow you to use the gun though.
    Ive never used the rope on a Stihl though. Always a gun( Dewalt cordless turned down low)
     
    angelo c, Mar 10, 2015
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  18. DexterDay

    DexterDay Administrator

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    With the clutch tool, you can still put a socket on it and use the impact.
     
    DexterDay, Mar 10, 2015
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  19. Boog

    Boog

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    Just be real careful if you ever use a "piston stop tool". If you ate too many Wheaties that morning you just might do this to your nice OEM piston ............... a 460 one in this case! :emb:

    piston_1.jpg
     
    Boog, Mar 11, 2015
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  20. NH_Wood

    NH_Wood

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    Ouch. This is why I use a stop tool only if I'm breaking down a saw with a known burned top end - rope otherwise. Cheers!
     
    NH_Wood, Mar 11, 2015
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