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chainsaws leaking oil

Discussion in 'Chainsaw' started by Nathan Graff, Jul 1, 2019.

  1. Nathan Graff

    Nathan Graff ArboristSite Operative

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    So, I have 2 saws leaking bar oil. Stihl ms200T and MS241C. How would one go about checking to see where they're leaking from? The cap seals look good at this point. Saws are sitting level.
     
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  2. s sidewall

    s sidewall Addicted to ArboristSite

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    Oil lines and pumps look ok?

    Steve Sidwell
     
  3. Nathan Graff

    Nathan Graff ArboristSite Operative

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    I haven't checked those. I have a look from the outside of the saw, but don't want to take something apart that is complicated to get back together when there's an easier way.
     
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  4. Jasonrkba

    Jasonrkba Addicted to ArboristSite

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    After running it open the cap then tighten it. Pressure builds up while running and has to go somewhere.
     
  5. Nathan Graff

    Nathan Graff ArboristSite Operative

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    I dont' know that that is the issue as the saws in question haven't run for a week or a month in the case of MS200T.
     
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  6. Huskybill

    Huskybill Addicted to ArboristSite

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    You didn’t park them too close to a Harley? They could pickup bad habits. Lol
     
  7. farmer steve

    farmer steve outstanding in my field, 5150

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    leaking from the cap or the oiler hole/bar area? the o rings can go bad but i think i may have only ever repalaced 1 or 2. i did have 1 cap that had a hairline crack in it and my dealer gave me another one. just curious but what weight bar oil do you use?
     
  8. jltrent

    jltrent ArboristSite Operative

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    Store them on their side...........I have had hundreds of saws and all of them have external lub seeping out while setting. It is either coming from the vent, pump, rubber line , crack case, oil cap. It is usually an easy fix, but a new pump on some is the only way to go and they will leak, but usually not as bad as one worn.
     
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  9. ken morgan

    ken morgan ArboristSite Guru

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    uhmm you got a chainsaw... it leaks oil... as forest gump said..."stuff happens ya know...****"
     
  10. Nathan Graff

    Nathan Graff ArboristSite Operative

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    At this point, all I know is that the oil is appearing under the saws. It doesn't look like the oil is coming from the caps.
     
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  11. Huskybill

    Huskybill Addicted to ArboristSite

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    Wash the saw then put the saw in a vise( bar) put newspaper under it. And check it often. If it’s a seal or o ring leaking make sure a shaft isn’t nicked. Or it will cut the new seal or o ring again. The second test after the vise is to remove the bar and chain place the saw on newspaper and watch it. When is the last time you cleaned the groove in the bar? Clean the surface were the bar is clamped too. Saw dust does get in there and it can leak too.

    I notice saws with longer bars do drip some oil. At the Jeep dealer my boss called it running seepage, the bottom of the cj5 was soaked with oil. That’s unacceptable but I kept my mouth shut.
     
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  12. Huskybill

    Huskybill Addicted to ArboristSite

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    my sons dirtbike was leaking oil out the shifter shaft. The shaft had a nick in it and it cut the new seal. I sanded the nick flush and put newspaper under the bike. I get up first in the morning and seen the leak has stopped. I poured oil on the newspaper and left for work. He was mighty upset I just laughed.
     
  13. Huskybill

    Huskybill Addicted to ArboristSite

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    If the case seam is leaking we’re the bar oil is there’s a silicone called pro seal on eBay. I used it outside on a dirtbike tranny case to stop a gear oil leak. I drained the tranny, washed it with simple green, then with alcohol, then applied the silicone on the seam. Then a put a spot light bulb overnight to cure the silicone. It never leaked again. It was an older bike we couldn’t get parts for.
     
  14. Huntaholic

    Huntaholic ArboristSite Operative

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    Its the nature of the beast. Its a chainsaw, its going to leak oil. Ive lost count of how many saws Ive had in my lifetime and when used, every single one of them will leak to some degree. Ive got 2 saws right now that have never leaked a drop of oil in the year or so that Ive owned them: one is a 390xp and the other is a 372/375xp. The reason they have never leaked is because they have NEVER had a single drop of oil or gas put in them! :D
     
  15. InfiniteJest

    InfiniteJest ArboristSite Operative

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    20190628_094811.jpg

    These are sitting on plywood to soak up the mess. The one on the right is a month old 572. Leaks like a bastard. Just the way it goes.
     
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  16. NCPT

    NCPT Love my saws

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    Yep, they leak. My 346xp spewed oil when I got it, replaced the o-ring and that fixed it. I use thick cardboard to set my saws on, soaks up the oil.
     
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  17. Nathan Graff

    Nathan Graff ArboristSite Operative

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    ok, so, rather than looking at the easy part first, I took the side of the ms200 off to have a look at the oiler. The oiler and the connection into the tank were dry. Oh well, it could use a blowing out anyways.

    Note to self, release the chain break when taking the side cover off that saw.

    Took off the recoil cover, and the whole of that side was soaked in oil. Looked at the caps I was sure weren't the problem. Looks like the o-ring had debris on it.

    Same with the MS241. I have to get them cleaned up now. I"ll report back if that worked.
     
  18. NCPT

    NCPT Love my saws

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    Haha, we have all done it.
     
  19. bwalker

    bwalker Resident Hack Sawbuilder Exposer

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    Check the tank vents.
     
  20. Nathan Graff

    Nathan Graff ArboristSite Operative

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    I've been trying to find a tank vent. Any idea where it's at? Right now, I'd think that the caps may be more at fault. I took the caps out, cleaned them up really good, took the o-rings off, and wiped them good, and wiped down the mating surfaces for the tanks. I added some bar oil to the tanks. Still seem to be leaking. Bad o-rings or bad caps??

    I didn't fire the saws up after filling. I used med weight stihl oil.
     
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