RandyMac
Stiff Member
That round boss is a leftover from the original auto oiler, that needed 10 to 1 mix to work it.
McCulloch Chain Saws
- Thread starter Bruce Hopf
- Start date
Help Support Arborist Forum:
Eccentric
Mister Wizard
Exactly. The 'LubriMac' equipped crankcase scavenging "automatic oiling" saws had a threaded in check valve in that boss. It's funny that while Mac dropped that failed system around 1960 or so (give or take), that same round boss is on all large frame McCulloch engine castings until the end of the run in the 1970's. The 'super series' engines never were in saws that had the LubriMac system, yet their blocks have the boss for it. Their block dies had to have been made after the LubriMac system was dumped. Maybe Mac used that boss when indexing the blocks for machining.....
Eccentric
Mister Wizard
The long AF cover is indeed what you have. The short cover was an earlier design used on the D-30/D-36/1-40 series saws. It was used again (but painted black) on the last of the 250 saws. Probably a way to use up leftover stocks of the old covers that'd been collecting dust for 10 years.
The auto oiler pump on the front tank saws is inside the fuel tank (a bit odd, but that's how they did it). It bolts to the back wall of the fuel tank (towards the rear of the saw) below the filler opening. If the saw has a fuel tank body machined to accept an auto oiler pump, but the saw isn't equipped with the pump, there will instead be a 1/8" thick blockoff plate bolted to that tank wall.
R & d
Too hot outside, so I spent some time in the chainsaw lab. I took some blurry spy pictures.
What this is for?
Also got a quick shot at this little stainless steel bracket:
I was told RandyMac may need one someday.
View attachment 245163View attachment 245164View attachment 245165View attachment 245166View attachment 245167
Ron
Too hot outside, so I spent some time in the chainsaw lab. I took some blurry spy pictures.
What this is for?
Also got a quick shot at this little stainless steel bracket:
I was told RandyMac may need one someday.
View attachment 245163View attachment 245164View attachment 245165View attachment 245166View attachment 245167
Ron
Hmmm
Before I left I got some pictures of a high performance MAC being used as a mock-up:
I sure hope that DSP valve cap doesn't melt.
View attachment 245172View attachment 245173
Ron
Before I left I got some pictures of a high performance MAC being used as a mock-up:
I sure hope that DSP valve cap doesn't melt.
View attachment 245172View attachment 245173
Ron
RandyMac
Stiff Member
What are you up to?
No good. Ron
Seriously, Randy, I am putting a SP81 muffler on my favorite PM800 that I am rebuilding after I turned the high side screw the wrong way. I understood that you might be toying with yours and eliminating the box muffler as well.
The flywheel cover is different on the newer MACs and they use the muffler to direct air flow (no wonder they had to put bigger fins on the flywheel). I just made a lower cowling so I could stick with the newer flywheel cover (the recoil mounts are beefer than the older ones - I supposed to prevent the no DSP carnage we saw a few days back with the compression testing). Also it eliminates a lot of the other mods I would have to make if I used the older cover and cowling. The little stainless steel bracket is to give the muffler some support as there are no muffler screw bosses on the side of the newer blocks. This is just a prototype as it need to be made from thicker material. The cowling should be good to go.
Ron
The flywheel cover is different on the newer MACs and they use the muffler to direct air flow (no wonder they had to put bigger fins on the flywheel). I just made a lower cowling so I could stick with the newer flywheel cover (the recoil mounts are beefer than the older ones - I supposed to prevent the no DSP carnage we saw a few days back with the compression testing). Also it eliminates a lot of the other mods I would have to make if I used the older cover and cowling. The little stainless steel bracket is to give the muffler some support as there are no muffler screw bosses on the side of the newer blocks. This is just a prototype as it need to be made from thicker material. The cowling should be good to go.
Ron
You guys back home are having fun and I am still on the other side of the world...sometimes it seems like it's just not fair.
I did take advantage of the available internet connections the past few days and ordered some Buna N tubing, a few socket head cap screws, and a couple of e-bay item like the McRacing T shirt and black McHat.
Can't wait to get home later this week.
Mark
I did take advantage of the available internet connections the past few days and ordered some Buna N tubing, a few socket head cap screws, and a couple of e-bay item like the McRacing T shirt and black McHat.
Can't wait to get home later this week.
Mark
ozflea
Good ol' BP Zoom 25-1
promac850
formerly promac610
Well, picked some blueberries and got two mini macs as well. No, I did not have to pay for them... (the mini macs, that is...)
He said they're so evil that they can make a priest slap his mother... anyone gonna start some bets up regarding how long it'll be before one or both of these meet their demise by a .45?
We'll see. I hope to get them both running well. One of them is supposed to run as it is, kind of.
Haven't got pics of them yet. Maybe tomorrow.
I hope those welsh plugs come in as well. Regarding those, is there a way to ensure they're sealed for good on the cylinder? Just use nail polish like you would on the carby welsh plugs?
He said they're so evil that they can make a priest slap his mother... anyone gonna start some bets up regarding how long it'll be before one or both of these meet their demise by a .45?
We'll see. I hope to get them both running well. One of them is supposed to run as it is, kind of.
Haven't got pics of them yet. Maybe tomorrow.
I hope those welsh plugs come in as well. Regarding those, is there a way to ensure they're sealed for good on the cylinder? Just use nail polish like you would on the carby welsh plugs?
I think you will be better served by one of the more modern sealers like Three Bond 1194.
Mark
Mark
paccity
Addicted to ArboristSite
just a 15. but it's pretty clean for being dirty. and it runs and cuts.
Nice saw, complete with the clutch cover and everything. I like those yellow and black bars, don't see too many of them in the large frame McCulloch style.
Now there is a saw that can rattle your fillings...
Mark
Now there is a saw that can rattle your fillings...
Mark
Eccentric
Mister Wizard
Yep, ThreeBond 1194 is good stuff. It's also packaged as Hondabond-4, Yamabond-4, Suzukibond-4, and Kawasakibond-4. The Hondabond-4 part number even has 1194- as the prefix.
Eccentric
Mister Wizard
And it's a "Kart Saw" (or they 'hear' that the engines from these saws make great kart powerplants) according to the ebay sellers.
And it's a "Kart Saw" (or they 'hear' that the engines from these saws make great kart powerplants) according to the ebay sellers.
Everything is a Kart engine on ebay! Doesn't have to be a Mac.
promac850
formerly promac610
Got a tube of it at a local motorcycle shop.
Welsh plugs aren't in yet, so I think I'll be tearing down the parts mower to get the deck separated from the engine, handle, etc.
The welsh plugs will be here either tomorrow or the next day. Hopefully I don't have to wait until Thursday for those.
Similar threads
Want to Sell
Vintage Collection Liquidation
