The Traveling 3120

[Mastermind]

Here's a saw that's done a bit of traveling........all the way from Alaska to visit my little backyard shop.

We didn't take any before pics.......but here's a few pictures of him with his crank hanging out. :wink:









Sorta needed a piston......more about that later.

 

[Mastermind]

Jon is getting the case half ready to drop in the bearings here.......he's found that starting out heating the bar pad first makes it go quicker.





Pretty simple setup.......but very effective.



Slid right in......



After a few minutes the bearing will pull enough heat out of the case to allow the crank to slip in....

 

[Mastermind]

Now to heat the other half.



Even though we are using a new OEM case gasket we still coat the gasket with Loctite 518.



Centering the crank......



And there it is.

 

[Mastermind]

Pretty clean saw here.........very good condition.

 

[Mastermind]

Coming right along. I wish I could port one as fast as Jon can do the bottom end.



There's the old piston.......more about that in a bit.







272 coil here......that makes these beasts unlimited.

 

[Mastermind]

Now for some tweaks.....

Here's the air filter base. It needs some work.



That's better....

 

[Mastermind]

Now for the muffler.



Sawed in half.



That's a lot of BS.



And that's with the BS removed.



Now to put it back together.





And fix some un-needed holes.

 

[Mastermind]

 

[Mastermind]

So far Jon has been having his way with Roger's saw.....now I get to play with it a little while.





OK here's that piston again......



Now here's what happened to it.

No bevel at all on the ports. I don't know if they just forgot or what.....but it sure ruined the piston and the rings.

 

[Mastermind]

Now I get to try out a new boring bar on a 3120 jug........them jugs is cheap anyway. :notsure:







Seems to be cutting something outta there.



Now to cut the base...



And the cylinder extension.

 

[Mastermind]

We have a little interference issue here....



But that ain't no problem.





Now to figure out the port timing numbers we should use. But I'll just keep that stuff outta this thread.



Last pic of the night......so far all I've done is bevel the port edges to keep from scratching the new piston up. This is how it was when we tore it down.

 

[stihl sawing]

Awesome job, a quick question. when you center the crank, what keeps it in place from moving side to side? That thing oughta scream.

 

[Mastermind]

The bearings and crank are a press fit........it holds itself after centering.

 

[trx250r180]

your job looks too much like fun

 

[Mastermind]

your job looks too much like fun

It's pretty boring really.

 

[TK]

It's pretty boring really.

Literally

 

[Moody]

3120=:cowdance:

If I ever get rich or lucky I'd like to own an alky 3120.

 

[WoodChuck'r]

Frikkin' brand new saw....!

That thing is sweet! :broccoli:

 

[naked arborist]

Holy ✖✖✖✖ you guys look like you know what your doing :eek2: You should ask for tips on AS and stuff, just sayin. Those new wave builders could critique it for you and offer up some pointers.

One monkey to another :bananalove:

:celebrate:It was fingered

 

[Moody]

Holy ✖✖✖✖ you guys look like you know what your doing :eek2: You should ask for tips on AS and stuff, just sayin. Those new wave builders could critique it for you and offer up some pointers.

One monkey to another :bananalove:

:celebrate:It was fingered

:gtfo: I'm a new builder but I drink Coke and sweet tea. I'll pass on the new wave mountain douche.