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Low compression on my new Stihl MS362

Discussion in 'Chainsaw' started by James Sawyer, Mar 21, 2019.

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  1. kyle.kipple

    kyle.kipple ArboristSite Guru

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    Followed this whole thread from the start.


    Sent from my iPhone using Tapatalk
     
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  2. Derrick Sawyer

    Derrick Sawyer ArboristSite Operative

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    Yes, i am also waiting to see what Stihl says when they go over the saw to see what the problem is, although not sure if they would give all the details
     
  3. cuinrearview

    cuinrearview Red saw lover

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    Ah, so your question was rhetorical in nature...
     
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  4. farmer steve

    farmer steve outstanding in my field, 5150

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    Daniel you look a bit younger than your age in your profile. Hope I look that good at 118.:laugh:
     
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  5. X 66 Stang347 X

    X 66 Stang347 X ArboristSite Operative

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    My new never started 362cm other than tested at stihl had 150psi. [​IMG]
     
  6. Derrick Sawyer

    Derrick Sawyer ArboristSite Operative

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    James, you are offering to ship your compression tester? So you have the right adapter hose now? If so, what compression are you getting? My new 462 went from 120psi with the hollow (wrong) adapter to 160psi with the correct hose adapter. The other thing i've noticed throughout this whole thread is that farmer steve sure does like a lot of posts.
     
  7. farmer steve

    farmer steve outstanding in my field, 5150

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    :surprised3:
     
  8. Kostas

    Kostas ArboristSite Operative

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    He has recieved a lot of likes so it is good for him to give some of them back to us.
     
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  9. rwoods

    rwoods Addicted to ArboristSite

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  10. Daniel Haglund

    Daniel Haglund ArboristSite Lurker

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    So, the verdict is in. My 362 is right at 150 psi after 2 tanks of gas. The tester is probably not the best quality but it seems ok. At least the valve is at the bottom of the long hose.
    DSC_0545.JPG
    My 361 came in at 155 - 160 psi. It had 165 psi using my old tester. So it seems to me that my new saw has at least 150 psi of compression and that there is enough information in this thread that Stihl should fix you saw.
     
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  11. Daniel Haglund

    Daniel Haglund ArboristSite Lurker

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    Looks can be deceiving! I do feel a bit old some days. Usually after a day in the woods. But I had no idea I am this old!!! However that explains the feeling.;)
     
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  12. James Sawyer

    James Sawyer ArboristSite Operative

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    Yup that would be expensive... I appreciate the help.
     
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  13. James Sawyer

    James Sawyer ArboristSite Operative

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    I've always had the adapter (hollow passage type with no Schrader in the 10mm adapter) . On the end of my hose has a fitting with a Schrader, the 10mm adapter threads on to the Schrader fitting on the end of the hose. The gauge has a pressure lease at the gauge. I trust my gauge its a US made compression gauge, but I have to be honest the Schrader fitting has threaded into every thing I've had to test. This is the 1st time I've had to use a adapter. As soon as I get a chance I'm going to install a Schrader into my 10mm adapter. I lucked out the bore in the adapter is smaller then the Schrader tap...so I just need get on the lath and tap the bore and add the valve. I have everything but the time to get into the machine shop. The Schrader tap is tough to get a hold of, they are expensive...non standard threads. I hope what I have will work. The 10mm adapter I have is brass so shouldn't be to bad. I just bought one of those all propose valve stem tool which has the tap, I figure it should be good for at least this one bore. It appears that's what a lot people have been doing on my research trying to find a Schrader tap. The bore in my adapter isn't that big so I can image it changing my compression that much.
     
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  14. James Sawyer

    James Sawyer ArboristSite Operative

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    Well I get 110 psi hot, both shops that ran test get 110psi hot, only one shop ran a cold compression test and it was 120PSI cold...110psi hot. My saw I would say only had about a tank of fuel ran thru it... my hour meter show 1 hour total run time on the saw. I've never added fuel. The shop of purchase filled it, tuned it...this fuel was what I've ran the saw on cutting two trees. The second shop dump this fuel...they didn't like it said it smelled funny, Any way they re-fueled my saw and I ran my test cuts on this fuel. I will need to fuel the saw next time I run it. The shop of purchase has a very similar gauge to mine, the second shop I have no idea what they have.
     
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  15. gyp69

    gyp69 ArboristSite Member

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    Do you have the saw or does Stihl shop still have saw?
     
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  16. SteveSr

    SteveSr Addicted to ArboristSite

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    Instead of adding a schrader to your existing adapter which isn't tremendously easy as you not only have to tap the threads for the valve and then you must machine the correct seat for the valve. If you look at any schrader valve (old bicycle tube) you'll find the seat is part of the valve stem. See photo below...

    An easier option would be to fill your existing adapter up with JB weld or other epoxy and then drill a 1/16" hole through the epoxy. This would allow airflow and reduce the excess volume considerably.
     

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  17. SteveSr

    SteveSr Addicted to ArboristSite

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  18. stihlaficionado

    stihlaficionado God of ArboristSite

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    Watching FS "Like" posts is better than reading a lot of the threads , except oil threads & stuff like this one
     
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  19. X 66 Stang347 X

    X 66 Stang347 X ArboristSite Operative

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    Did you just do this cutaway? Cool if you did
     
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  20. lone wolf

    lone wolf MS 200T King

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    Well this is taking a while!
     
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