Analyzation of the 10 series McCulloch design

[Mastermind]

Great thread BTW.

I was in a few McCullochs from the days of glory.........and solid work saw type gains were tough for me to find. A little timing advance and some more intake timing........that was all I found. Of course I'm not too experienced with these models......so I may not have been looking in the right places.

 

[Redfin]

The mains are between the cylinder and the crankcase portion ,clam shell type .

Do you have a picture of the crank ends in the case?

 

[thomas1]

Do you have a picture of the crank ends in the case?

Stolen from chainsawr.

 

[Redfin]

Stolen from chainsawr.

Thanks T. I was curious of the style seal used.

 

[Al Smith]

Great thread BTW.

I was in a few McCullochs from the days of glory.........and solid work saw type gains were tough for me to find. A little timing advance and some more intake timing........that was all I found..

Quite frankly those plus a little widening of the exhaust was all I could figure out to do ..What pray tell does one do with a set transfers like those? I honestly don't know .
I had once theorized perhaps a little finger off the intake side transfer might help some .However on the one I did rework with no more than I did to it the thing will free throttle at around 15,500 .I doubt however were it to run the cut that fast if it would last very long .I haven't ran that noisey thing in a couple of years,hurts my ears .It's more or less like the piped mini,a big kids toy .

 

[PogoInTheWoods]

startin to look like no thread is immune to this chit on this site

No forum is immune to it. Some just put up with less of it while others literally seem to encourage it. Go figure. Doesn't seem to last long here, tho.

I've been around all of em long enough to ignore most of the noise these days and just keep tabs on the folks I've come to respect and from whom I've actually learned something positive or have received helped from along the way. If I can't participate in a positive way, I sorta tend to leave well enough alone now after wasting way too much time trying to change folks' minds about things they knew very little about anyway. Yeah. Silly me. Live and learn.

As for the Macs, I had a real dilemma on my hands for a coupla years with a very nice PM8200 that had a bad top end. Problem was, the bad piston was basically the only one to be found anywhere. Last hoorah 82cc design for Mac that used a 3 piece crank and wrist pin with circlips instead of the old pressed pin arrangement. Spares don't seem to exist or are in a warehouse somewhere that nobody remembers after Mac started circling the drain.

Long story longer, I started a thread about it and Al provided quite a bit of encouragement on the side when I decided to try salvaging the original piston even though I was pretty reluctant about it. Sent me some 20 micron lapping paper and said, "Go for it." Some patient elbow grease and new rings and it turned out to be a great running PM8200 that I'm real proud about reviving. Probably wouldn't have even tried, otherwise.

Thanks, Al.

​

 

[PogoInTheWoods]

Do you have a picture of the crank ends in the case?

Here's another look at the basic arrangement...(even tho it's the PM8200 version)

​

 

[Mastermind]

Digging this thread....

 

[TJ the Chainsaw Mechanic]

Digging this thread....

Don't dig it to deep.....

 

[raumati01]

Great thread , always keen to learn more/celebrate the classic.

 

[Al Smith]

If they had made the change on the piston design sooner the final outcome might have been different .The weak link of the whole 10 series were the bearings in the piston instead of in the rod .Those danged bearing would fly apart and "needle" the inside of the cylinder which most times rendered them non repairable .I've got the parts and pieces of a 700 that suffered that fate .It might be salvageable but the piston is toast .Another on the "to do " list which is getting longer not shorter .

 

[drf256]

Great thread Al. Thanks.

I've heard that Mac's were pretty much maxed out at the factory, unlike other models.

 

[Steve]

Al, I have always learned from you and enjoyed what you bring to the community.

I have many 10 series Macs. What they lack in modern convenience they make up for in brute wood cutting ability. Let's not forget the awe inspiring E-series. That saw has an electric starter, generator, battery all on board. And well thought out too. I'll post some pics of the innards on my 3-10E when I get home tonight for the interested parties to enjoy.

 

[Spike60]

Great to see some conversation on the older saws. Still like to get some trigger time on the old girls and cut some firewood with them. So, pics of a couple Macs I got.

New in the box Pro-Mac 700, and I'll probably never pop the cherry on her either.

 

[Mastermind]

I'd never start it either.

 

[Spike60]

These saws actually get to do some work. Pro-Mac 60 in the middle has seen the most run time with me. Light and handles much better than you'd expect from that era. Pro-Mac 850 on the right has seen a fair amount of time and "saved the day" once when the rope broke on a 372. Haven't run the 10-10 much beyond tune and test. And a load that I cut with the Pro-Mac 60 a couple years ago. It was Christmas Eve morning and this location was only 5 miles from my house, so I figured I grab a load before the family came up. My Dad, who's in his 80's says, "why didn't you wait for us?". So, him and my brother hopped in the truck and we went back over and grabbed another load. Merry Christmas!! LOL

 

[Steve]

If I am going to cut with a Mac for work not play I always grab my pm60. Just kicks azz.

 

[countryhog]

No forum is immune to it. Some just put up with less of it while others literally seem to encourage it. Go figure. Doesn't seem to last long here, tho.

I've been around all of em long enough to ignore most of the noise these days and just keep tabs on the folks I've come to respect and from whom I've actually learned something positive or have received helped from along the way. If I can't participate in a positive way, I sorta tend to leave well enough alone now after wasting way too much time trying to change folks' minds about things they knew very little about anyway. Yeah. Silly me. Live and learn.

As for the Macs, I had a real dilemma on my hands for a coupla years with a very nice PM8200 that had a bad top end. Problem was, the bad piston was basically the only one to be found anywhere. Last hoorah 82cc design for Mac that used a 3 piece crank and wrist pin with circlips instead of the old pressed pin arrangement. Spares don't seem to exist or are in a warehouse somewhere that nobody remembers after Mac started circling the drain.

Long story longer, I started a thread about it and Al provided quite a bit of encouragement on the side when I decided to try salvaging the original piston even though I was pretty reluctant about it. Sent me some 20 micron lapping paper and said, "Go for it." Some patient elbow grease and new rings and it turned out to be a great running PM8200 that I'm real proud about reviving. Probably wouldn't have even tried, otherwise.

Thanks, Al.

​

Theres an 8200 on ebay

 

[Al Smith]

My buddy Tom who owns a tree service experienced the theft of nearly all his saws,twice .It was the beginning of the season .He borrowed one of my 200T Stihls,a 700 Mac and an 038 Magnum I had rebuild at least twice before he gave it to me ,the Mac was also a gift .Those three saws carried the day for a couple of weeks before he had enough cash to replace his stolen saws .He said the old Mac never missed a beat in that time .

 

[exSW]

My 850 First saw I ever did a nut n bolt rebuild on.