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Little Mcculloch 797 project

Discussion in 'Chainsaws' started by Frank bierce, Nov 9, 2019.

  1. Frank bierce

    Frank bierce Here For The Long Haul!

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    Picked this saw up a few weeks ago on eBay. Have some time today to check it out a little. Looks like it will need a little work. Should be a pretty picture heavy thread.
    A678965A-4441-4C13-B390-E91EE286DD86.jpeg
    Muffler shroud hole has been rattled, and ripped through...so a bolt and washer is now needed to hold it in place. (Apparently these saws have some vibes??):lol:
    CC04E129-5EFE-4669-B4ED-15E1B901AADB.jpeg

    Wrap handle on it, has a pretty bad chain rash hit that needs to be repaired.

    9AF112F5-CB0A-4AD6-AC40-C9D89C10E649.jpeg 1E0181CA-D02A-46EE-AF42-71377E439DD1.jpeg

    Original square muffler?
     
  2. Frank bierce

    Frank bierce Here For The Long Haul!

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    carb box...nothing too exciting here
    37ECEEA6-DD0E-4260-B7DC-F26B19A75BE8.jpeg
    Some ambiguous piston pics to start with...ambiguous filter pics next ;)
    Piston does show a little heat damage will clean it up as best I can...don’t really see any scoring. Will need to get some rings for it A309477B-A082-4E23-8ED1-51CEDADEA9CB.jpeg D449EBEE-7470-49B1-8327-E09AF1397D9C.jpeg

    I also see the recessed muffler mating area. Had a quick schooling on the different blocks cp125/125c/101/797 from a fellow member, and as I recalled, the 797 used a copper exhaust gasket? E11572DA-9DFF-4B18-9919-C4F03DCB604F.jpeg
     
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  3. jacob j.

    jacob j. Mastermind Approved!

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    Very cool Frank - the regular 797 IPL shows a full-length copper exhaust gasket, but the Super shows an in-set gasket like your block has. However, the Super shows a thick-ring piston.

    So maybe you have a Super block with an earlier piston?
     
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  4. p61 western

    p61 western Mastermind Approved!

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    Would the super have the boost port Jacob?
     
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  5. jacob j.

    jacob j. Mastermind Approved!

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    Mike -

    It shows the boost port cover and gasket on the IPL for the super, so I'm guessing so. The two saws I have are frankensaws and I think one
    of mine has the CP cylinder, so I've never been able to really discern the actual differences between the super and the regular.

    I think Lee is the expert on these - he's rebuilt many.
     
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  6. Frank bierce

    Frank bierce Here For The Long Haul!

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    Maybe I’ll get my super 797 out to see what I can come up with, that is different.
     
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  7. Bigmac

    Bigmac Here For The Long Haul!

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    They both have boost ports I believe Mike.
     
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  8. Bigmac

    Bigmac Here For The Long Haul!

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    This will be cool Frank! Looking forward to this
     
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  9. Bigmac

    Bigmac Here For The Long Haul!

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    what are the block numbers Frank?
     
  10. Bigmac

    Bigmac Here For The Long Haul!

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    I believe the 797’s got the puck muffler and the 795 got the square
     
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  11. Frank bierce

    Frank bierce Here For The Long Haul!

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    Here is the ipl I have downloaded...shows a square muffler. 28AA5F8C-1461-4F15-9D08-99C60E103404.png
     
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  12. Frank bierce

    Frank bierce Here For The Long Haul!

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    Here is where it sits now.
    21F64348-B8A6-443D-A854-B73E2DA54412.jpeg

    Looks like the dsp decomp has been leaking for a while. Plunger is very loose, and wallered out
    53EDB728-C28C-4A63-A365-EACEDD745660.jpeg
    Also noticed the top, where the 125 decomp s are, has a threaded plug
    D71D77F4-A2A2-4336-93D1-E604E185930D.jpeg

    Here are the block numbers 86C05FF8-8B39-4BC8-8204-0FBE154DF706.jpeg
     
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  13. Bigmac

    Bigmac Here For The Long Haul!

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    Yes indeed! Must be just the supers got the puck? Or just the cp?
     
  14. Frank bierce

    Frank bierce Here For The Long Haul!

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    Also not seeing boost ports. image.jpg
     
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  15. Bigmac

    Bigmac Here For The Long Haul!

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    That looks just like my cp block, must be a late super797 block, my cp block has that style exhaust port, but it has the cp casting number on the pto side, have heard the super 797 didn’t always have identifying numbers
     
    Last edited: Nov 9, 2019
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  16. Frank bierce

    Frank bierce Here For The Long Haul!

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    I’m thinking it may be a CP block.
     
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  17. Bigmac

    Bigmac Here For The Long Haul!

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    I haven’t had my 797 apart, but dose that block have av mounts on the top of the head?
     
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  18. Frank bierce

    Frank bierce Here For The Long Haul!

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    hmmmm, it does not.
    image.jpg
     
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  19. Bigmac

    Bigmac Here For The Long Haul!

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    Then late super 797! It may confirm what many believed, that the late 797 and early cp blocks were super similar! I am curious to see the combustion chamber!
     
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  20. Frank bierce

    Frank bierce Here For The Long Haul!

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    here is the combustion chamber.
    image.jpg
     
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