2172 and 372 crankcase question

[Ronie]

How important is that bar that runs over the the flywheel? I've got a 2172 that the bar is broke on and was wondering if it would be ok to run it like that.

 

[cuinrearview]

I've got a 357 I'm going to be assembling this winter that won't have that. A Dolmar I just sold had it, but it was all bent up. Ran fine.

 

[Ronie]

I've got a 357 I'm going to be assembling this winter that won't have that. A Dolmar I just sold had it, but it was all bent up. Ran fine.

I figured it would be ok without it but wasn't sure. I know the 2 series don't have that brace.

 

[huskihl]

It’s just a support for the recoil and top cover. I suppose if a limb hit it while it was running it could chew up the plastic and ignition wires

 

[Ronie]

It’s just a support for the recoil and top cover. I suppose if a limb hit it while it was running it could chew up the plastic and ignition wires

That's good to know, thank you.

 

[Ronie]

Has anyone tried to use them low temp aluminum brazing rods on a crankcase? I was thinking about cutting that piece off a junk case and filling it in.

 

[beaglebriar]

Has anyone tried to use them low temp aluminum brazing rods on a crankcase? I was thinking about cutting that piece off a junk case and filling it in.

View attachment 206686

The case is magnesium so I'd guess that's not gonna work.

 

[Ronie]

The ad says they are for aluminum and magnesium. It would be nice if the would work.

 

[cuinrearview]

Sometimes you just gotta embrace building a beater saw Ronie. #itiswhatitis

 

[Ronie]

I'm going to order some and give them a try. They are cheap so if it doesn't work I won't be out much.

 

[Stump Shot]

I'm going to order some and give them a try. They are cheap so if it doesn't work I won't be out much.

Give us a report on how they work.

 

[Ronie]

Give us a report on how they work.

I'll will.

 

[Czed]

I've had a couple like that no problems for me.
Never smashed them though.

 

[beaglebriar]

The ad says they are for aluminum and magnesium. It would be nice if the would work.

View attachment 206689

Cool. Definitely interested in seeing the results.

 

[Ronie]

Cool. Definitely interested in seeing the results.

I ordered some and Ill post the results sometime next week.

 

[Outback]

I would be real careful around that thin piece with a torch. We used to light magnesium ribbon back in school to ignite other metal mixtures with a standard propane torch. Your not going to have the shielding gas of tig to protect the mag from ignition. I would do it outside on the off chance you got the case to catch on fire and couldn't put it out. The proper fire extinguisher is probably not a bad idea either.

This is a cool idea and if you can get it hot enough to wet right without ignition it sounds like a great way to fix a small issue. Good luck.

 

[Ronie]

I would be real careful around that thin piece with a torch. We used to light magnesium ribbon back in school to ignite other metal mixtures with a standard propane torch. Your not going to have the shielding gas of tig to protect the mag from ignition. I would do it outside on the off chance you got the case to catch on fire and couldn't put it out. The proper fire extinguisher is probably not a bad idea either.

This is a cool idea and if you can get it hot enough to wet right without ignition it sounds like a great way to fix a small issue. Good luck.

I'm going to try it on a junk crankcase first and will be doing it outside.

 

[drf256]

I think it’s a good idea to try Ron. Probably easier than trying to tig a dirty case, less prep.

I’d take a small piece of the junk case and heat it first, see if it ignites.

Like said above, you won’t have the safety of shielding gas like a tig does.

 

[Ronie]

I think it’s a good idea to try Ron. Probably easier than trying to tig a dirty case, less prep.

I’d take a small piece of the junk case and heat it first, see if it ignites.

Like said above, you won’t have the safety of shielding gas like a tig does.

I'm going to practice on a junk case. I think I read that magnesium's ignition point is like 850 and the melting point of the rods are around 700 so we'll see how it goes.

 

[Ronie]

i got the Hobart rod and it didn't work out to good. The case started melting before the rod and even caught fire for a moment. On the end opposite the vise grips you can see ow the piece started to bend down from the heat and that black spot is from catching on fire. Oh well, it was worth a try.