HELP! What to do with mag rot in the crank case...

[Woodwackr]

Husky 390xp that was left out in the elements enough to get moisture into the crankcase
Once disassembled I found the rot as well as what seemed like carbon crystals...not good. The bearing actually weren't bad but will still be replaced. Initially I hit the areas with a fine Dremel wire wheel, cone type. This, to get the major crud and be able to better see what's there.
Today I carefully media blasted the rot areas, staying away from bearing and seal seats.
It seems to have cleaned up well.
So, leave it alone? Let the mix oil keep further corrosion away? Thoroughly clean with acetone and then JB-weld and sand it all smooth? Replace the case? The saw will get minimal use.
Bearing seats are good; seal seats will be ok but I'll definitely use some sealer.

 

[quattro.pilot]

Not that I'm the authority on Mg rehab & repair, but my feeling is I would just leave it now as-is and put the saw back together. I don't think I would be smearing JB into there at all....seems like that's a can-o-worms to me. Sucks that a fairly young case got weathered

 

[Shane¹]

I am no expert but I would just run it as is I would assume the oil from the bottom end would help it from continuing to rot and should be good to go for a long time

 

[JIMG]

I have a 266 I rebuilt a while back that had rot like that in. I cleaned it up with a wire brush and daubed a little rustoleum on it. It runs fine. very well, actually.

 

[farminkarman]

Another vote for leaving the cases alone and putting it back together.

 

[Ketchup]

Same. That’s relatively minor case rot.

 

[beaglebriar]

Leave it. The fuel mix will protect it.

 

[Woodwackr]

Thanks. That's what I figured. I have older cases a little worse

 

[Sloughfoot]

Slather it real good with Ivermectin.

 

[Avisagio]

That's a very light case of mag rot. I'd run it as is.

 

[Glock37]

blast and powder case half
Cant get all the rot out unless blast and repowder

 

[Wonkydonkey]

blast and powder case half
Cant get all the rot out unless blast and repowder

Although I agree with all those that say leave it at it is and the fuel & oil mixture should be ok .. however I agree with Glock37 if you really want to stop it, then blast it and powder coat it

As with any rot in any metal,,, it becomes a site for any future atrachment (sacrificial place ) ..

 

[Bjorn]

You can blast it with glass balls, and then you can spray paint it with etch primer. That is cheaper, but power coat is the best. Especially if Glock37 do the coating, he do excellent work.

 

[Woodwackr]

You can blast it with glass balls, and then you can spray paint it with etch primer. That is cheaper, but power coat is the best. Especially if Glock37 do the coating, he do excellent work.

Already blasted it. I’ll just throw it all back together with new bearing/seals and a new top end.

 

[Glock37]

As long as you got the loose material out it will be ok
Run a good mix 40- 32 to 1 oil will keep it from continue too rot