High Quality Chainsaw Bars Husqvarna Toys Hockfire Saws

MCCULLOCH The official McCulloch thread

Lightning Performance

Here For The Long Haul!
Local time
1:45 AM
User ID
677
Joined
Jan 26, 2016
Messages
10,991
Reaction score
28,056
Location
East of Philly
All great ideas I'm sure.

Having a machine shop next door and diamond tooling makes this an easy conversion for me. I've got plenty of diamond burrs to make oil holes. His carbon drill bits took a beating last time just like mine always do. I know for sure he melted two carbide cutters working on the Sabre bar I sent over. Also have a few bars that were sent out be straightened that came back in about the same condition. The first use moved around the steel on one of them. Going back to my old school hammer and eyes method. They need to be set with impact on the steel because the press work does not stay put.
 

Al Smith

Here For The Long Haul!
Local time
1:45 AM
User ID
537
Joined
Jan 14, 2016
Messages
6,389
Reaction score
14,196
Location
North western Ohio
Country flag
For the Stihl bars I just basically machine like thick washers to take up the slop .Fact the Stihl 066 size I have for big Homelite the driver count remained the same .10 series Mac bars depends on who made them ,For example some bars have enough adjustment to able to run either a 7 tooth rim or 8 tooth with a standard driver count of 70 on a 20" 3/8" chain . Some you about need to add another driver or cut the slot .Too tight for a 70 driver and not enough for a 72 driver .Then you hang it on a nail and get it confused with a standard loop .
.
 
Last edited:

Dream

Mastermind Approved!
Local time
1:45 AM
User ID
7152
Joined
Aug 27, 2018
Messages
8,352
Reaction score
45,270
Location
Elberton, GA
Country flag
0.045" are in fact the thick rings. Thin rings are tool steel and 0.022" thick. 92517 are the correct rings if there are no locating pins. You have the correct seal numbers, let me know if you can't find them elsewhere.

Mark
So I finally got back from work.
This piston DOES have locating pins.
Rings are not notched for them.
Ring end gap is .055".
The pins are .043" if my calipers are getting in there. Both pins measured the same, so maybe?
That would leave .012" for wear indication, but it doesnt seem right to me to have that much gap.
Would think it would be losing a lot of compression there.
Any insight or helpful hints appreciated.
 

Steve

Excellence!
GoldMember
Local time
12:45 AM
User ID
639
Joined
Jan 21, 2016
Messages
8,345
Reaction score
44,713
Location
Missouri
Country flag
So I finally got back from work.
This piston DOES have locating pins.
Rings are not notched for them.
Ring end gap is .055".
The pins are .043" if my calipers are getting in there. Both pins measured the same, so maybe?
That would leave .012" for wear indication, but it doesnt seem right to me to have that much gap.
Would think it would be losing a lot of compression there.
Any insight or helpful hints appreciated.

My steel ring 6-10 will hang from the rope all day long. Has pins and ring gaps just as yours.
 

Lightning Performance

Here For The Long Haul!
Local time
1:45 AM
User ID
677
Joined
Jan 26, 2016
Messages
10,991
Reaction score
28,056
Location
East of Philly
So I finally got back from work.
This piston DOES have locating pins.
Rings are not notched for them.
Ring end gap is .055".
The pins are .043" if my calipers are getting in there. Both pins measured the same, so maybe?
That would leave .012" for wear indication, but it doesnt seem right to me to have that much gap.
Would think it would be losing a lot of compression there.
Any insight or helpful hints appreciated.
Run it.

I won't go tighter than 0.008 on a 2" bore or under. Bigger saw should have 9-10 minimum imo. Thick rings or thin rings.
 

Al Smith

Here For The Long Haul!
Local time
1:45 AM
User ID
537
Joined
Jan 14, 2016
Messages
6,389
Reaction score
14,196
Location
North western Ohio
Country flag
My steel ring 6-10 will hang from the rope all day long. Has pins and ring gaps just as yours.
Since you mentioned it believe it or not because I advanced the timing my 6-10 will wind up to over 15,000 . It's the best running 10 series saw I have over cants .It's also the loudest . It's put the look of amazement on the faces of a lot of people including myself . There's more to it though than just a bump in timing .That's one saw I spent a lot of time on ,more than any other I've ever done . I'm done with it because if I'd have kept on tweeking eventually it would be time bomb .I have no desire to have a saw engine come apart like a dollar watch .
 

PogoInTheWoods

Pinnacle OPE Member
Local time
1:45 AM
User ID
1190
Joined
Apr 23, 2016
Messages
1,954
Reaction score
3,881
Location
Ohio
Country flag
Any insight or helpful hints appreciated.

Untitled.jpg
Regardless of the type of ring, and when considering the pin, you should be fine in the lower end of the ballpark described above. .097 on the other hand is getting up there and may actually be a typo.
 
Last edited:

Al Smith

Here For The Long Haul!
Local time
1:45 AM
User ID
537
Joined
Jan 14, 2016
Messages
6,389
Reaction score
14,196
Location
North western Ohio
Country flag
I can't put my finger on it, have no idea why or how it happens .Never the less on iron bore Mac saws reeders or piston ported the rings and the bearings plus the seals seem to last forever .I've pulled them down and even showing eccentricity they still run quite nicely .It's not the oil because todays mix oil is much better .It's not the age because I've got several dating back to the late 50's that still run like they were factory fresh .One such is a Super 44A which morphed into the MC 10 kart engine that still owns records after all these years .Maybe R.P. McCulloch had secrets he took to the grave with him ?
 

Definitive Dave

Piss Rev Mafia Member
GoldMember
Local time
1:45 AM
User ID
297
Joined
Dec 28, 2015
Messages
5,194
Reaction score
34,208
Location
Central Ohio
Country flag
Since you mentioned it believe it or not because I advanced the timing my 6-10 will wind up to over 15,000 . It's the best running 10 series saw I have over cants .It's also the loudest . It's put the look of amazement on the faces of a lot of people including myself . There's more to it though than just a bump in timing .That's one saw I spent a lot of time on ,more than any other I've ever done . I'm done with it because if I'd have kept on tweeking eventually it would be time bomb .I have no desire to have a saw engine come apart like a dollar watch .
I wanna see this saw someday sir :)
 

Al Smith

Here For The Long Haul!
Local time
1:45 AM
User ID
537
Joined
Jan 14, 2016
Messages
6,389
Reaction score
14,196
Location
North western Ohio
Country flag
If this lock down ever ends and some day another GTG is planned I'll bring a truck load many people have never seen before including the hot rod Mac 6-10 .The avatar saw being another one .Few have seen one of those antique PNW redwood slayers that ran correctly . I myself have only seen three of them in my life time .How about a gear drive Mac 650 with a 2 to 1 reduction unit .Fewer have ever seen one of those running or static display .
 

Steve

Excellence!
GoldMember
Local time
12:45 AM
User ID
639
Joined
Jan 21, 2016
Messages
8,345
Reaction score
44,713
Location
Missouri
Country flag
If this lock down ever ends and some day another GTG is planned I'll bring a truck load many people have never seen before including the hot rod Mac 6-10 .The avatar saw being another one .Few have seen one of those antique PNW redwood slayers that ran correctly . I myself have only seen three of them in my life time .How about a gear drive Mac 650 with a 2 to 1 reduction unit .Fewer have ever seen one of those running or static display .



Lockdowns are over Al. GTG are happening as we speak. You load them up and I'll be there! :)
 

Dream

Mastermind Approved!
Local time
1:45 AM
User ID
7152
Joined
Aug 27, 2018
Messages
8,352
Reaction score
45,270
Location
Elberton, GA
Country flag
Regardless of the type of ring, and when considering the pin, you should be fine in the lower end of the ballpark described above. .097 on the other hand is getting up there and may actually be a typo.
Well there you go.
Straight from Robbie Mac himself.
Thats good info.
Not that I dont trust all of you guys.
I just wanted to make sure everyone understood what I was working with.
Thanks to everyone for the help!
 

Steve

Excellence!
GoldMember
Local time
12:45 AM
User ID
639
Joined
Jan 21, 2016
Messages
8,345
Reaction score
44,713
Location
Missouri
Country flag
Perhaps but none I know near this area .I refuse to go to A-site for any info or any other reason .


Don't worry, I'll have to travel several hours and get a hotel to any gtg I attend. It's worth it though.
 
Top