Pro Mac 850 project
- Thread starter promac850
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promac850
formerly promac610
I've been boiling the cylinder for about 20 minutes now, and holy ####, you will not believe how much carbon and crap is in the bottom of the pan. 
To think people run their saws with that crap in there.
To think people run their saws with that crap in there. promac850
formerly promac610
Here are some pics... as you will notice in the third pic, there are little pieces of carbon and various other crap sitting on the bottom of the pan. I don't want that in my saw. So, I'm cooking it off. The second pic shows the biggest thing to remember, for the sake of even cooking. Move the cylinder around a little bit. Lay it on its side and roll it over for even coverage for perfect taste. 
First pic is showing the pan, with the cylinder in it.
Second pic is the cooking method for even distribution of heat for effectiveness.
Third pic is the crap in the bottom of the pan.
First pic is showing the pan, with the cylinder in it.
Second pic is the cooking method for even distribution of heat for effectiveness.
Third pic is the crap in the bottom of the pan.
Last edited:
promac850
formerly promac610
It's amazing, the water is almost completely black now! I thought the paint thinner in the parts washer was doing a good job cleaning the cylinder off. Nope, not by far. Boiling is superior. Turned the burner off, and am letting it cool down, then I will pull it out of the pan, and let it sit overnight. Tomorrow, I will boil the top of the piston, and hopefully that will work just as well. 
RandyMac
Stiff Member
I once boiled a carb from a '63 Rambler, there was nothing left but sludge and brass fittings.
I'm waiting for you to give up and mail off the box of parts. :hmm3grin2orange:
I'm waiting for you to give up and mail off the box of parts. :hmm3grin2orange:
promac850
formerly promac610
I don't think a carby from a 1963 Rambler is neccessarily well made to start with... Still waiting for me to give up? Not gonna happen, I've wanted a big saw (80cc or so) for quite some time.
Don't worry, someday I'll send a saw to you. Rebuilding this saw is fun, I'm just taking my time and making sure I do it right. 
Chris J.
Addicted to ArboristSite
I don't claim to have read every comment posted in every thread in the Chainsaw Forum on ArboristSite, but I can say this:
I have never before read or heard about anyone boiling chainsaw parts to clean them.
Promac610, where did you get the idea to boil parts? I'm not picking, just curious.
I have never before read or heard about anyone boiling chainsaw parts to clean them.
Promac610, where did you get the idea to boil parts? I'm not picking, just curious.
promac850
formerly promac610
IIRC, it was Stinkbait that did it with his c/p for one of his saws. Not positive, but I think he was the guy that I read of doing it, he even had pictures of the cylinder and piston when the boiling was done.
RandyMac
Stiff Member
Still waiting for me to give up? Not gonna happen, I've wanted a big saw (80cc or so) for quite some time.
Just testing your resolve.
Thanks for the offer, I have more chainsaws than I know what to do with.
I am thinning things out. You want a fixable 10-10?
promac850
formerly promac610
RandyMac
Stiff Member
Good deal, give me a week or so and I'll find the spare 10-10s.
homelitejim
Full of Scrap
Have we been working on the 850 today. Sure could use a few fresh pics.:hmm3grin2orange:
sorry just bored I have to wait until wednesday for fresh parts.
sorry just bored I have to wait until wednesday for fresh parts.
RandyMac
Stiff Member
Not exactly a fresh pic, it will give you something to work toward.
homelitejim
Full of Scrap
Not exactly a fresh pic, it will give you something to work toward.
That's the good stuff. Thank you for the fix.
RandyMac
Stiff Member
8pin, 3/8", full chisel, full comp.
promac850
formerly promac610
Homelite Jim reminded me... here a pic. This is after the pan had cooled down, this is the first boiling, and you can clearly see all of the junk that came out of the cylinder. I boiled the cylinder again, this time in clear water, and still more carbon and grease came off of it. Simply amazing.
This is after the pan had cooled down, this is the first boiling, and you can clearly see all of the junk that came out of the cylinder. I boiled the cylinder again, this time in clear water, and still more carbon and grease came off of it. Simply amazing. promac850
formerly promac610
Try that with a stock Stihl 066.
Ain't gonna happen. You had a 32" bar on that Mac, right?
RandyMac
Stiff Member
Looks like something from a Hmong restaurant.
promac850
formerly promac610
It does. 8433jeff
Aftermarket connoisseur
Promac soup. Number 850. With fried rice.
