husqy 372xp repair

[Al Smith]

I don't know if it's actually mag or not .Some time ago Mike Acres made some comment about some of the early McCullochs were mag but they had a tendency to crack after extended usage and the process was converted to use an alloy of alumium .

That big Homelite in my avatar is mag and my buddy who welded some spots on the starter housing had quite a time on it .Lawdy I had to make some "ears " which were attached with screws instead of being welded which worked fine but it certainly was a pain in the butt .You know something like that it isn't like you can just trot on down to a dealer and order a new part so you gotta do what you gotta do .

Back to this Husqvarna .If you knew the exact alloy it most likely would simplfy the process of repair but where pray tell that information would be is anyones guess .

 

[Al Smith]

Well now this case split could seem like a daunting task if you've never done one for sure .The best advice I can give is to not get excited or in a hurry .You gotta develop that mind set that if someone else can do it must be possible .

You gotta remember what you're dealing with here .It's a small high speed two cycle ,precision made not a big Cat diesel engine .

Then again everybody has a tollerence level .Mine being very patient on a saw but very short tempered with computor soft ware which about drives me up a wall when it doesn't go good .I'd like to tune the SOB with a big hammer at times for whatever good that would do .

 

[cory]

The Zen of being a good mechanic. Cool, Al!!

 

[cory]

Btw, I wonder which is more rare, good mechanics or good treemen?

 

[Magnus]

How many good saw mechanics have you met?

There is a great difference in dealers and they kind of complete each other.
If you haven't found one you like, look more, they are there some were.

Most are sellers more than mechanics. Some know a lot, but only like new stuff.
There are few that have great interest in saws and work on older. Most of us are collectors too... Eat, breathe and dream of saws.
This is no biggie from a collectors point of view, not really from a mechanic's either as it is not a big thing to swap parts to a new case or change the half broken.
To a dealer this is dead! Too much work/time/money to repair.
Better just get a new money maker if it is for a businesses that need it to run. If not it is well worth fixing.

 

[Magnus]

Al.
There is Magnesium in all Husqvarnas cases, but never same amount.
Can be different in two case sides even...

 

[woodworkingboy]

Probably tough to weld such animals. Magnesium melts at a much lower temp than Al.

 

[treesandsurf]

Strangely enough I had bought some of this fast action adhesive liquid welding stuff a few months back. Stuff is not cheap, it was close to $40 for the two small bottles. I was going to use it to fix the chipper leak but didn't get around to it. Used it to weld back together the broken piece on the 372xp. Actually seems to have worked pretty well. I've got the two pieces together and after letting it set I tried to pull it apart, tapped it with a hammer and it is SOLID so far. We'll see...

On another note, found that there was more damage than I had thought. The circular metal piece that goes around the sprocket had metal fragments and pieces stuck to the surface causing it to stick to the sprocket. I'm thinking from the impact of a 40ft fall, might have done it?? Ordering a new sprocket and that metal piece that goes around it (name) tomorrow. Hopefully she goes back together.

Check out the adhesive stuff:

http://www.youtube.com/watch?v=rt2elvwNFqo

Will post some more pics in the next day or so...
jp

 

[Magnus]

I use ceramic metal and other epoxy glues to fix rather than welding.
If you do a good job cleaning and perhaps a reinforcement some were it usually hold very well, just as well as the rest of the case. Biggest problem is tension, but yours was of, so I think that this could work well!

 

[SkwerI]

The metal piece around the sprocket, would that be the brake band?

 

[Cut4fun]

372 IPL so you can name the part. http://s30387.gridserver.com/partsDiagrams/Husqvarna 372.pdf

 

[treesandsurf]

Thanks for the part list. I think that's what it's called Brian, sounds right anyway.

jp

 

[Al Smith]

Al.
There is Magnesium in all Husqvarnas cases, but never same amount.
.

Well yes I assumed that .I often refer to it as diecast because I really have no idea what the alloy is composed of .

Metalurgy is a study in itself of which I know more than most but am not by any means an expert on the subject .Like a piston could have nickle in the alloy or a degree of silicone .Cast iron itself could have any number of components in the mix depending what the intended end usage is .Brass could have a zillon usages and a zillion alloys .

 

[Magnus]

Diecast is a type of casting. It is "under pressure casting". Not as easy to get pores and mis formations as with just pouring in to a mold.

You are right there is lots of stuff in the mixes. Each mix can easily be adapted to be optimal for the part to cast.