Just watching the Tinman tear apart an 850 for porting on YouTube. Be good to see what he does with it
McCulloch Chain Saws
- Thread starter Bruce Hopf
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I keep thinking about using a Mini Mac or string trimmer engine as an impulse pump so I can test the fuel pump section in a carburetor before putting it back in a saw. Of course that will mean creating a few flanges for saws that get the impulse signal from the mounting flange but that should not be too difficult. I needed to test this one today (Tillotson HT carburetor off a Stihl 880...forgive me McPeople) so I connected a veterinary type syringe to the impulse and pumped back and forth like a madman...it worked and I could demonstrate to myself that the fuel pump was working. Ultimately it worked...off the saw...for the life of me I could not figure out why it would not move fuel on the saw so I pulled the spark plug to make cranking it easier...now it was moving fuel. Replace the spark plug, starts and runs for a few seconds then stops moving fuel again. After several attempts I hear something rattling, it should not do that, so I start to take the muffler off and discover the cylinder was loose. Two screws were gone completely, the other two were loose. At least I finally figured out why it was not generating the impulse signal to run the fuel pump.
I am filing this mostly non-McCulloch report here since more people will see it and I will eventually make my impulse generator out of some piece of McCulloch kit.
I suppose I am breaking some Federal law by not discarding the syringe after using it but I'll risk it. I use that red oil can filled with mix to prime saws when needed, seemed suitable as a reservoir for this test.
Mark
I am filing this mostly non-McCulloch report here since more people will see it and I will eventually make my impulse generator out of some piece of McCulloch kit.
I suppose I am breaking some Federal law by not discarding the syringe after using it but I'll risk it. I use that red oil can filled with mix to prime saws when needed, seemed suitable as a reservoir for this test.
Mark
Hopefully the cylinder is ok ,they can be pretty $$$.
I wonder if there's a little bellows that could be substituted for the syringe? I know I've seen some kind of powdered candy that had a dispenser like that, I have a lot of younger cousins .
I wonder if there's a little bellows that could be substituted for the syringe? I know I've seen some kind of powdered candy that had a dispenser like that, I have a lot of younger cousins .
Funny you should mention the red oil can for priming carbs.I have a red pump oil can that I use for the same purpose.
Camperspecial
ArboristSite Member
I use syringes like these to suck up a thick oil that I use in my wood shop. For your purpose you could even have the spring inside the syringe tube. I think this would work for your purpose. I plan on trying on the next carb. Thanks for the idea. However, I do like the idea of having a dedicated engine mounted to the bench just for this. Anytime I see someone over complicate something by making it gas powered it gives me a warm feeling. At the last Steam engine tractor show a few weeks ago here in Oregon a guy had a 6hp single cylinder hit/miss engine with a four inch belt driving a gearbox that had a pencil sharpener on it and a bunch of pencils for people to sharpen. Bless this guy.
The drawing bears some resemblance at a glance. I can see someone (including me) thinking it was.
Rpm to high or just right?
Coming up next month,Sept.9,10,11,& 12 will be the 54th annual W.N.Y.Gas & Steam Association Rally in Alexander,N.Y.This is one huge gala consisting of old time steam engines,farm tractors,hit & miss engines,threshing & saw mill demonstrations,daily tractor pulls,etc.I remember going to the very 1st one when I was 9 back in 1967.There were only a few hit & miss engines & I think there was one steam engine running a thresher.This thing has grown to the point that they purchased a 200+ acre farm (one of the buildings I helped construct when I was 23 for the farmers who owned it back in 1981,it was a 50ft.x150 ft pole barn).People come from all over the U.S.The last time I was there I saw one of the tractors we had on our farm & also one of my grandpa's tractors that he bought brand new in 1940,an Allis Chalmers model B.
Need some help. I need aftermarket part numbers for crank seals. 1-70
Thanks. Jason.
Thanks. Jason.
When idling or revved?
Revved
I know there are published figures but don't most people tune the High by how it goes in the wood?
A fellow AS member made this video, I quite like it:
A fellow AS member made this video, I quite like it:
matt_lamb_160
ArboristSite Operative
Looks like my 550 is leaking between the casting and the insert the PTO side crank seal sits in. Anyone dealt with this before?
Sounds right about at the top edge of perfect to me. A sharp chain in a nice log would tell the tale. I'd say any adjustments either side of where you are will likely just be small ones to accommodate different b/c setups and/or cutting conditions.
Nice job.
LocTite 290 is a wicking grade, creeps into areas like that. I have used it on the small PTO side seals on the 10 Series saws and it always seems to work.
Mark
Mark
matt_lamb_160
ArboristSite Operative
Thanks. That is what I was after.
This followed me home today. It's in pretty fair shape! Spent all it's life over on the Oregon coast then made it over to North Idaho where it's been sitting for many years. Decomp switch is busted and of course the check valve in the fuel cap is mush. There's a little bit of oxidation in the fuel tank but not terrible. It turns over and has compression so I'm hopeful. The things I find cool are the intact muffler guard, the sdc carb and intact front bracket. Will yank yank muffler off tomorrow and have a good look inside. Looking forward to bringing this back to life. Been very busy with fire season hitting hard and early here in north Idaho in July. Haven't been able to touch a single saw until the last day.
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Sent from my SM-N970U using Tapatalk
What do the chickens think?
They are less than thrilled. They always get super offended whenever I fire up a saw.
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Sent from my SM-N970U using Tapatalk
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