McCulloch Chain Saws

[promac850]

Finally!!!

Got the 790 cylinder back from the shop...

Looks good, and is bored/honed. Got it done for 50 bucks. (whaaat!?!) Should've just gone there in the first place...

Polished the top of the new piston, and don't worry, I did not polish off the part number that was etched into the piston at the factory.

Also polished the exhaust port, that should reduce or completely eliminate carbon build up there.

Got some more blasting to do, probably should get that done tomorrow morning, since the storm isn't supposed to hit until later in the afternoon.


And did this...

My neighbor and I ran saws from about 9 to 2 cutting the logs up... well, the 610 keeps acting funny (air leak/lack of fuel, she screams as she gets ready to shut off, or idles funny) and would cut and run good, then just shut off, sometimes in the middle of the cut. I've got the ******* tuned rich enough to drink a tank in three or four cuts, 20" bar not even half buried... something ain't right...

He attempted to get his old Homelite XL Automatic started so I could use it to keep cutting stuff up, and it wouldn't run. In the end, we were limping along with 1.5 saws. (his $99 dollar refurbed Homelite/Poulan 49cc saw was the only one cutting, and the 610 interrupted every now and then... that's the .5 saw, lol) In hindsight, I should've put the 610 back in the barn, and tinkered with the 850... That's the only problem with hindsight... it ain't there when you really need it to be...

We then we loaded the trailer up after we cut up about half of the log pile. (who lugs each individual round over 200 feet to the splitter? Anyone? Didn't think so...)


Later tonight, we probably will see what's going on with the 790 project...

 

[Ambull]

Thanks again Mark. I planned on using blue Loctite, both to seal and to hold tight on these vibrating old beasts.

I remember when I restored my SP125. I got it all together and it started right up. I literally watched most of the screws back themselves right out of the holes. It was crazy. I put them all back in with blue loctite, torqued them a little harder, and none have backed out since.

On the old mac saws, nearly every screw is either a 10-24 or 1/4-20. I bought a few boxes of hex washer head screws 10-24 in various lengths, and I use these whenever I rebuild a saw. Also, for the insert nuts, I bought a box of distorted thread hex nuts in 10-24, and I just replace them all.

On many of the Kart motors, allen head screws are used. This is a nice upgrade, as the allen heads are usually grade 8.

 

[Sawchips]

Use Bob's number, but fax it in .... it's trapping season now and that's the only way he can receive orders.

Thanks, "W5" I'll give this a try.

Try calling Bob in the afternoon, close to 5:00 PM Eastern for the best chance to catch him.

If nothing else works out, let me know as I expect I can find one in the attic.

Mark

Thanks to you too Mark. Tried Bob just before this post with no luck. I'll keep after him.

Thanks to Charles as well. He gave me the name of a local shop that may have something in their "Mac Pile"

 

[cpr]

Here's what you'll find when you get there. Self serve.

 

[RandyMac]

If anyone is interested, I put together a 10 Series McCulloch Oiler thread with lots of photo's out in the chain saw forum.

Mark

I placed it in the All things McCulloch thread.

 

[OldDeadWood]

110 Oiler

There's a lot of oiler talk right now so here's a question.

My 110 is still running good but the auto oiler is using a tank of oil for three quarters
tank of gas. It's not leaking out it's pumping it into the guide bar.

Do I turn the screw in for less oil, or back it out.

Thanks

ODW

 

[joeymt33]

There's a lot of oiler talk right now so here's a question.

My 110 is still running good but the auto oiler is using a tank of oil for three quarters
tank of gas. It's not leaking out it's pumping it into the guide bar.

Do I turn the screw in for less oil, or back it out.

Thanks

ODW

you are correct, in is less and out is more.

 

[Sawchips]

Here's what you'll find when you get there. Self serve.

"Wow"

That's too cool!!

 

[OldDeadWood]

joeymt33

Thanks

ODW

 

[cpr]

"Wow"

That's too cool!!

Yep. Some neat stuff, but nothing really rare or desireable... not anymore anyway .

 

[heimannm]

New arrival today thanks to Sawbones.

More tomorrow...

Mark

 

[buzz sawyer]

3-25 decal

Can anyone tell me the wording on the 3-25 gearbox cover decal? Just a few words I can't make out.
Thanks in advance.

 

[promac850]

I just realized I forgot to start up the 790 project thread.

While I'm posting here, does anyone think I should port the 790 cylinder? Not really as in balls-out hog them holes open, but more of matching ports and general clean up/minor grinding/filing around and in the ports to ease the flow of air/fuel mix and exhaust gasses.

Just wondering what some (or all) of you think on the idea. I am still sitting on leaving it alone, but if there are enough people saying do it, then I will do what I had in mind if I was going to work the ports a little.

Just how rare is a unmolested 790 cylinder? How about some of the other saw cylinders (I recall reading that unmolested kart cylinders are fairly hard to find) such as the ones for the 10 series saws, and even the Super 44A/55A saws?



RandyMac, I recall you kept mentioning a six cube 10 series... you trying to get me to fit the 790 engine into the 850 or something?

Not that I don't like the idea or anything... it does sound quite dandy, until you realize how many times you're gonna have to fill the sucker up to do a pile of logs... the gas tank is tiny on a 10 series...

 

[RandyMac]

I just realized I forgot to start up the 790 project thread.

While I'm posting here, does anyone think I should port the 790 cylinder? Not really as in balls-out hog them holes open, but more of matching ports and general clean up/minor grinding/filing around and in the ports to ease the flow of air/fuel mix and exhaust gasses.

Just wondering what some (or all) of you think on the idea. I am still sitting on leaving it alone, but if there are enough people saying do it, then I will do what I had in mind if I was going to work the ports a little.

Just how rare is a unmolested 790 cylinder? How about some of the other saw cylinders (I recall reading that unmolested kart cylinders are fairly hard to find) such as the ones for the 10 series saws, and even the Super 44A/55A saws?



RandyMac, I recall you kept mentioning a six cube 10 series... you trying to get me to fit the 790 engine into the 850 or something?

Not that I don't like the idea or anything... it does sound quite dandy, until you realize how many times you're gonna have to fill the sucker up to do a pile of logs... the gas tank is tiny on a 10 series...

There were many 790s made, maybe teardropping the intakes a little would be good.

That big clunk in a 10 series, well, no. I was thinking a true 10ish type six cube.

 

[Eccentric]

5ci is about all McCulloch could reliably fit in the 10-series platform.....and that was with several strengthening measures. However, they could have designed a larger crankcase/crankshaft/oil tank assembly to make a 6ci saw. My theory is that McCulloch didn't believe that a 6ci redesign of the 10-series was worthwhile.

The SP/PM105 and SP125 saws covered the big saw market well enough. Those saws were later largely killed off by the move away from horrizontal jug saws for logging ( fire prevention regs, etc). A 6ci 10-series would have been awesome......but was also a dead end. Mac instead rebadged some foreign vertical jug 100+ cc saws (Dolmar and Partner) to cover their sales in what was for them a dwindling market. McCulloch was also becoming the box store brand that carries the name today.

 

[heimannm]

I missed an 895 on e-bay a few weeks ago, but had been in contact with the seller before the auction closed so he knew I was looking. He passed along a message that indicated member Sawbones had one available so I made contact and we agreed on the deal.

Saw arrived last night and I found a few simple things that I could attend to, replaced one missing screw in the flywheel cover, replace the muffler as the old one was really shot - to the point the baffles were rattling about - added the duck bill valve and vent on the gas cap.

First off I removed the spark plug and checked for spark and compression, good fat blue spark and around 130 PSI on the compression. Next I checked the manual oil pump and it seemed to work so add some oil and we have a pumper. Fuel tank was clean so I added fuel and decided to give it a try. This one is equipped with the McCulloch "flat back" carburetor but the one with a choke, not the primer. Within 10 pulls it popped and was off and running, automatic oiler also checks out. For those that are not so familliar with the big gear drive McCulloch saws, the automatic oil pump is driven off the sprocket shaft so it only pumps oil when the chain is moving.

Lastly I added the bar and chain, NOS 36" McCulloch bar with the black MAC swoosh logo. Chain is 1/2" pitch chipper, very little use and of extremely high quality construction. Look at the last photo and see how the rivets are actually set in counterbores in the tie straps...that is one really rugged chain. Winter finally arrived in Iowa last night so we will just have to see how much cold & snow & blow we get, if it's not too bad I will have to take this one out on Saturday and put it in some wood.

Mark

 

[OldDeadWood]

Help

View attachment 216868

I'm looking for a shop manual that covers the smaller McCullochs. Any help would be appreciated.

Thanks

ODW

 

[OldDeadWood]

Oiler Thread Link

Here's a link to Mark's very nice oiler thread.

http://www.arboristsite.com/chainsaw/190113.htm

There's a ton of great information in here but it's hard to find. Those who find or write it
should put links where they think interested members will be.

And give credit where credit is due.

ODW

 

[heimannm]

View attachment 216868

I'm looking for a shop manual that covers the smaller McCullochs. Any help would be appreciated.

Thanks

ODW

Check you e-mail...

Mark

 

[boda65]

Here's a link to Mark's very nice oiler thread.

http://www.arboristsite.com/chainsaw/190113.htm

There's a ton of great information in here but it's hard to find. Those who find or write it
should put links where they think interested members will be.

And give credit where credit is due.

ODW

If you join the group "All Things McCulloch" RandyMac has done a fine job of combining a number of McC repair/restore threads. I believe any one can add a link. Just click on "Community", then "Groups". Search groups for the McCulloch group. Then join.