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Mcculloch Super Pro 125c Complete rebuild.

Discussion in 'Chainsaw Stickies' started by hkusp9, Sep 15, 2012.

  1. arrow13

    arrow13 ArboristSite Operative

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    SP125C oil tank leak

    After a closer look inside my oil tank, I found the lower boss broken off, thus causing the oil to leak out. Apparently someone in the past turned the front mount bolt in too tight. Couldn't find the broken piece so it's been a while since that happened. The upper one is still solid.
    Has anyone ever tried to seal the inside with epoxy? I'm thinking of trying it once I get it cleaned, if that's possible.
    Will
     
  2. heimannm

    heimannm Addicted to ArboristSite

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    I have been successful making repairs to an oil tank (740) using JB weld. I cleaned it first with solvent, then carburetor cleaner, then some grinding, then carburetor cleaner again, holding up after a few years.

    Mark
     
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  3. leeha

    leeha Addicted to ArboristSite

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    arrow13, I would not repair that tank. There is alot
    of strain on that front mount. Regardless of what Mark
    says, It's a different ball game than a 740. 740's don't
    have that anti vib mounted to the side.
    A good tank is not that hard to find. Contack axeman on
    ebay. I bet he has them.




    Lee
     
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  4. arrow13

    arrow13 ArboristSite Operative

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    SP125C Oil Tank leak fix

    Thanks guys for more input. I'm going to look for another tank. Once you mentioned alot of strain, I'll stick on the side of caution. When I get this tank off, I'll take a real close look at the damaged area. It's in my nature to look at the details. This old saw appears to have been well used here in western WA and the top of the handle is bent back slightly. Perhaps it was dropped or fell and possibly caused the oil leak too. I've purchased from axeman before. I'll check with him for a tank.
    On another note, I just pulled the clutch off and the bearings were shot. Time for a new one as the rest of it look pretty worn and sloppy.
    Will
     
  5. All Tree NW

    All Tree NW ArboristSite Lurker

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    this whole sticky is hilarious.
     
  6. arrow13

    arrow13 ArboristSite Operative

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    SP125 C Oil Tank

    Lee, you were right. I got a nice tank with oiler and painted too. Axeman gave me the choice of with or without the oiler. Also got a nice clutch from him too.
    I've got to get a fin welded on my saw before I can start getting it back together. Thanks again.
    Will
     
  7. leeha

    leeha Addicted to ArboristSite

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    Your welcome.
    Is it just one fin on the cylinder.
    If so i wouldn't worry about it.
    It will be just fine without it.





    Lee
     
  8. sachsmo

    sachsmo Addicted to ArboristSite

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    How does the SP/CP compare to your favorite?
     
  9. arrow13

    arrow13 ArboristSite Operative

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    It's the one fin that holds the heat/air shroud. When I tore this saw down, the top fin had bolts going through it with nuts as spacers to hold that top fin up for the shroud and top vibration mount to bolt to. The bolts had nuts on the bottom between lower fins. Hard to get a wrench on them but I got it. The set up worked apparently. Just thinking it would tidy up the saw a bit and make working on it a little easier in the future.
     
  10. leeha

    leeha Addicted to ArboristSite

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    That fin or mount i would most definately repair.
    Thats the one that holds the whole top av mount.
    It's aluminum so if it's good and clean you should
    be able weld it or have it welded.





    Lee
     
  11. ozflea

    ozflea Good ol' BP Zoom 25-1

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    Best and strongest repair is forget the broken fin and fit a Mac 101B cylinder shroud as many have already done just need to drill and mount the av mount to the shroud.

    McBob.
     
  12. arrow13

    arrow13 ArboristSite Operative

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    I've got a friend who's a very good welder for this. It's pretty clean metal. Thanks for clarifying the type of metal. I was thinking there was more magnesium in it vs. aluminum. That should make the repair easier.
    Will
     
  13. arrow13

    arrow13 ArboristSite Operative

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    Top fin repair

    I didn't know anything about that type of repair. I'll look into it. Do you know if anyone has taken any photos in past posts that I could look at?
    Will
     
  14. ozflea

    ozflea Good ol' BP Zoom 25-1

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    Just get the welder to be careful heating the top of the cylinder i have an SP125 here thats been welded and it concerns me
     
  15. arrow13

    arrow13 ArboristSite Operative

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    Fin repair

    OK, will do. Thanks ozflea for the additional advice.
    Is there a prefered type of aluminum rod or wire for this type of work?
     
  16. leeha

    leeha Addicted to ArboristSite

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    The rod i would use is 5356.





    Lee
     
  17. arrow13

    arrow13 ArboristSite Operative

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    Thanks Lee. I'll share this info with my welder friend.
    Will
     
  18. FSburt

    FSburt ArboristSite Operative

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    Wow what a way to spend a few hours going through this whole thread. A soap opera that started out innocently enough then came some drama and the finale being a quiet end with all going their own way. And I just came on to see what I could learn about fixing a Mac 125c too. :laugh:
     
  19. buzz sawyer

    buzz sawyer Addicted to ArboristSite

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    Did you find what you were looking for?
     

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