125 MAC question

[hoss]

I am in the process of putting a new piston in one of my 125 mac's and have gotten it most of the way torn down. The problem is the spline head con rod bolts. What tool do I use to remove them and where can I get it? Any idea's would be helpful. Thanks guys.

 

[leeha]

Hoss, Are they a 12 point head.
If so you would need a 12 point socket
I'm guessing 1/4 or 5/16.


Regards Lee

 

[RED-85-Z51]

Probably the same stupid bolts I run in my Billet 4 cycle rods...12pt 1/4"

Pain in the butt to deal with, one tool most dont have in their set, but they are compact, and take torque.

 

[Jacob J.]

Some of the Sp 125s use a special splined rod bolt that takes a proprietary tool, originally made by McCulloch. If you post a pic of your rod bolts then we'll know for sure. I have the special tool and I would be happy to loan it to you.

 

[hoss]

Thanks for the replies guys. I will try to get some pics of the bolts.

 

[Tzed250]

Some of the Sp 125s use a special splined rod bolt that takes a proprietary tool, originally made by McCulloch. If you post a pic of your rod bolts then we'll know for sure. I have the special tool and I would be happy to loan it to you.

JJ is right....it is not a 12pt. It is splined, and you have to have the correct tool. McCulloch made both a wrench and a socket to fit the bolts. You have to use the factory bolt to clear inside of the crankcase.

 

[Gumnuts]

Had to take my to mower shop after trying to get the splined / special tool....
did'nt relish playing with those needle bearings.Small area ..big fingers......!!!
Third shop i went to sorted it !

Was mighty kind of Jacob to offer you a loaner.
Good luck with it.

Have you noticed the hole to lock your crank - through the case and into a notch in the flywheel ?....underneath !
- Graeme

 

[thomas72]

Yep, you probably got the spline head. You can get that socket from the mac tool man, or snap on. Don't try to use a twelve point socket on it as it will just round it. Good to see you are restoring an old 125. Must post pics of it when you are done.

 

[STIHL038MAN]

Some of the Sp 125s use a special splined rod bolt that takes a proprietary tool, originally made by McCulloch. If you post a pic of your rod bolts then we'll know for sure. I have the special tool and I would be happy to loan it to you.

Anyone know where I can get a hold of one of those socket heads?

Preferably in Australia but at this point I don't really care I just need one..

 

[happysaws]

Wow... 9 year thread revival...

 

[rwoods]

These tools used to be fairly easy to find but I have not seen one on eBay in quite some time. A fellow on another site recently butchered his splined bolts. Says he plans to replace them with socket heads. I hope he doesn't come to regret it as the bolts seem even more rare than the tools. Ron