ArboristSite.com Sponsors
 
 


Case crack! What to do??

Discussion in 'Chainsaw' started by longbar, Mar 9, 2011.

  1. longbar

    longbar Mr. BigWood

    Joined:
    Oct 20, 2009
    Messages:
    1,324
    Likes Received:
    177
    Location:
    minnesota
    I picked up a Husky 394 with a cracked case. Its not in the crank case but looks to be an important part of the saw structure. I thought about trying my luck brazing it? Otherwise try JB weld? Or leave it as is? Or the last option, finding a new case or halve? What do you guys think? Has anyone brazed magnesium? Or had good luck with JB weld on cracks like this?
    [​IMG]
     
  2. Oldsawnut

    Oldsawnut Addicted to ArboristSite

    Joined:
    Feb 6, 2007
    Messages:
    1,083
    Likes Received:
    92
    Location:
    Washington St.
    Wow thats a big crack... My vote is for a new case half..
     
  3. farrell

    farrell Weekend Warrior

    Joined:
    Feb 1, 2011
    Messages:
    5,558
    Likes Received:
    899
    Location:
    NW Pa
    if you look on youtube.com there is a guy that TIG welds the case to fix a crack similar to that. so TIG it or new case
     
  4. longbar

    longbar Mr. BigWood

    Joined:
    Oct 20, 2009
    Messages:
    1,324
    Likes Received:
    177
    Location:
    minnesota
    Yeah this poor guy wasnt shown any love! Not sure how they managed to break the case without messing up the plastic??

    Yeah I did see that. I think it was sawking. I do know some welders and may need to offer up some beer to see if they can help a brother out:msp_thumbup:
     
  5. mlavalley

    mlavalley ArboristSite Member

    Joined:
    May 16, 2006
    Messages:
    68
    Likes Received:
    6
    Location:
    Western MA
    I'd replace the case half before I tried the tig but both would work of course. Really your only option there.
     
  6. gloud

    gloud ArboristSite Operative

    Joined:
    Sep 23, 2010
    Messages:
    185
    Likes Received:
    22
    Location:
    western mass
    The issue with TIG is warping. If it was a smaller crack I would weld, but with the long crack, you will have to make sure the mating surfaces are true before you put the saw back together.

    And no you can't braze mag. it has to be welded. I don't think JB weld would hold up long.
     
  7. srcarr52

    srcarr52 We can't stop here, this is bat country.

    Joined:
    Aug 13, 2009
    Messages:
    2,212
    Likes Received:
    532
    Location:
    Coralville, IA
    That is a big ugly crack to tig weld. Getting that welded without too much distortion will be a PITA. It would take a skilled welder at least an hour to prep and weld that at $60/hour. Unless you have a friend that can weld it you are better off finding a used case side or full case.

    Good news is that nothing bolts to that area besides the one AV mount and the starter cover. It's not going anywhere, you could just run it that way. Just don't let your friends see it. :msp_tongue:
     
  8. bobt

    bobt Addicted to ArboristSite

    Joined:
    Dec 4, 2009
    Messages:
    1,122
    Likes Received:
    365
    Location:
    Michigan
    Looks like a new case half is in order. Even if I were to try to Tig weld it, I would disassemble the saw first.

    Just to add a little information to this thread. A previous poster stated that magnesium cannot be "brazed". It certainly cannot be brazed with traditional "brazing rod" made of brass. However magnesium can be oxyacetelyne welded. You need to have the proper rod and paste flux, and the skill to do it though.

    Bob
     
  9. gloud

    gloud ArboristSite Operative

    Joined:
    Sep 23, 2010
    Messages:
    185
    Likes Received:
    22
    Location:
    western mass
    Yea I didn't want to get into that.. :msp_blink: It can either quickly end up a puddle or on fire if joe amateur welder attempted it. (which I am to an extent, But I have done enough to know I don't know it all .. LOL Thats what my bro-in law is for(professional welder since the 60's) . I would just drop this mess in his lap and he would grumble for awhile and then bring me back the welded part I would have to true up on my mill. ):msp_smile:

     
  10. blsnelling

    blsnelling Site Sponsor

    Joined:
    Nov 8, 2006
    Messages:
    44,505
    Likes Received:
    10,259
    Location:
    Franklin, OH
    You definately need another case.
     
  11. longbar

    longbar Mr. BigWood

    Joined:
    Oct 20, 2009
    Messages:
    1,324
    Likes Received:
    177
    Location:
    minnesota
    I think your right about the warping issue. After going back out there and looking at it it would be a pain to even hold flush to weld.
    I like your idea of just using as is. Im thinking of doing that until I can find a different case. It wont be used alot so I I think I should be fine for awhile.
    Bob your correct about the brazing. I did some research online to see what was required. So I could at least have 2 of the 3 requirements to do the braze.:msp_laugh: Now if only I could buy the skill. I am fairly good at brazing but have never done it on a soft metal.

    Thanks for the information guys!!! You knocked some sense into me to do it the right way and get a new case.
     
  12. blsnelling

    blsnelling Site Sponsor

    Joined:
    Nov 8, 2006
    Messages:
    44,505
    Likes Received:
    10,259
    Location:
    Franklin, OH
    It may only be one AV mount, but there aren't many on the saw. That's a very important mount. No way would I leave that saw that way, especially on a saw that large. A case won't cost you that much.
     
  13. longbar

    longbar Mr. BigWood

    Joined:
    Oct 20, 2009
    Messages:
    1,324
    Likes Received:
    177
    Location:
    minnesota
    :cry: I think your right Brad! Thanks for another smack in the back of the head:laugh:
     
  14. Bob Wright

    Bob Wright Addicted to ArboristSite

    Joined:
    Apr 27, 2004
    Messages:
    2,062
    Likes Received:
    225
    Location:
    Salem, Oh
    I would opt for another case. Even though i could TIG it up thats a big crack...Bob
     

Share This Page