Yikes! What happend to these?

[Chris J.]

First photo is Jonsered 49 piston; second is Jonsered 70 flywheel.

Also, on the 70 cylinder, has someone plugged the whole for a decomp valve?

 

[Lawn Masters]

the 70 flywheel, looks like someone just held a chisel against it while the motor was running. the piston on the 49, looks like someone ran it for A LONG TIME with no air filter, and something in the intake port area wearing down the skirt of the piston.

On the 70, there was NEVER a decomp valve to my knowledge. I believe that may be a port for something husqvarna introduced on the smaller saws called a nordfeller, which was a wedge type deal inflated by exhaust gases.

 

[Chris J.]

Something caused the piston to break or shatter, I shook pieces of it out of the crankcase housing. The exhaust side also some breakage, just not nearly as bad. The 49 jug looks good, which surprised me.

I can't figure out how all of the fins on the flywheel got broken, & I have no idea what that is in the jug, first time I've seen it..

 

[Lawn Masters]

I'm pretty sure the jug has that hole for a fitting for either a nordfeller attachment. as far as the piston goes, all I know is I sure hope ya didnt pay much for either saw.

 

[eric_271]

Chris don't worry, those are common practices. Both have been lightened for faster revs though the workmenship looks a little shoddy. Make sure and touch them up with some never dull befor you reuse them.

 

[Chris J.]

Eric, I'm going JB Weld that 49 piston, smooth it down better than new, then mod the saw for competing in the 0-50cc hotsaw races. As for lightening the 70, the entire heavy flywheel needs to come out of there. I making good progress on rigging an electric starter from a Craftsman mower, just need to make it work using two AAA batteries.

NeverDull is good, but I prefer the less expensive Sta-Sharp, also it's from the folks that make Sta-Bil. Have you tried the No-Raker chain yet? It's made by Mas Mal, an outfit out of Mexico.

I'll keep you posted on the results, but you know that my policy is not to post any photos of my work. Aw ra best!

 

[Chris J.]

Rob, I didn't pay a lot, but definately too much .

Say, Eric, shouldn't you :angel: be in church now?

 

[kf_tree]

chris

that was a dual plug moter........jred played with for a little while.

 

[Chris J.]

Dual plug? That's something new to me, worth investigating. So maybe I have a rare, very valuable Jonsered model 70 . Thanks for the info, kf.

Oh, the JB Weld should be ready for sanding tomorrow night.

 

[kf_tree]

Dual plug? That's something new to me, worth investigating. Thanks for the info, kf.

Oh, the JB Weld should be ready for sanding tomorrow night.

don't investigate too hard........... i'm pulling your leg.

 

[Chris J.]

And I took the bait hook, line, & sinker. Oh well, once a DA always a DA. So, whatz up with the extra hole in the jug? Anyone?

 

[Lawn Masters]

I'll ask Mange, and George blake and see what I can turn up.

 

[sedanman]

I have a new 49sp piston, e-mail me

 

[Lawn Masters]

As I guessed, this is direct from George Blake. its for a nordfeller.

Back when the 70E was in production, there was an option called the "Nordfeller".

The Nordfeller was a expandable pillow at the end of a heat resistant hose. This hose connected to a valve mounted onto the starter cover. The valve had a tube which was connected to the cylinder where this plug is mounted.

The idea was, you would first notch and cut the tree, but not cut it enough to make the tree fall. You would then insert the pillow into the cut. Push a button on the valve, and exhaust gas from the cylinder blows into the pillow causing it to expand. The expanding pillow "pushes" the tree down in a controlled fashion.

Saws equipped with a Nordfeller are very rare here in the USA. I have one in my collection, but I had it shipped in from Sweden.

Saws equipped with the Nordfeller were known as 70EN.

 

[woodsrider]

I've only seen a photo of a "nordfeller" -- never seen or used one. I think the photo was in a book titled "Chainsaw Savvy" by Neil Soderstrom. The book features many photos of Daniel Tilton (Tilton Eqmt. Co.), including several of him using the nordfeller.

Did the nordfeller attachment actually work? I don't see how the exhaust gases could produce enough pressure to lever a tree over. They musta worked on that smaller nordic wood, though....

PS -- sorry for the momentary thread hijack. Back to our regularly scheduled programming....

 

[Lawn Masters]

I suppose the Nordfeller worked, but I dont know how well it did tho.

 

[spacemule]

Did the nordfeller attachment actually work? I don't see how the exhaust gases could produce enough pressure to lever a tree over. They musta worked on that smaller nordic wood, though....

Being in the top of the head, it wouldn't be normal exhaust gas pressure, would it? Would this not be operating more like an air compressor?

 

[jokers]

Did the nordfeller attachment actually work? I don't see how the exhaust gases could produce enough pressure to lever a tree over. They musta worked on that smaller nordic wood, though....

Hi Woodsrider,

Yes the nordfeller works. Just think pounds per square inch over many square inches equals alot of force, just like the Scott Air Bags that Rescue Squads use.

Russ

 

[Chris J.]

A nordfeller, eh? Thanks, Rob. Do you have the actual attachment? I'd love see a photo of one. So that must make my 70 very rare, and extremely valuable . Paul, I'll send you an email.

Thanks to all, & aw ra best!

 

[woodsrider]

A nordfeller, eh? Do you have the actual attachment? I'd love see a photo of one. So that must make my 70 very rare, and extremely valuable .

Boy, this nordfeller discussion has gotten me all worked up! Here's a couple of photos I took from Neil Soderstrom's book, Chainsaw Savvy. Check out the narrative, also. The photos picture Daniel Tilton. Any guesses as to what brand of saw Tilton is running -- hehe?!

Pretty big tree; pretty small bar! Note the comment about the center-bore cut.