ArboristSite.com Sponsors
 
 



 
 


Page 1 of 2 12 LastLast
Results 1 to 15 of 20

Thread: Swapping saw body halves

  1. 01-17-2009, 08:39 PM #1
    redunshee
    redunshee is offline
    Arboristsite MVP
    Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation
    Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation
    Join Date
    Oct 2007
    Location
    Texas, but spend time in Vermont
    Posts
    4,054
    Credits
    1,647

    Swapping saw body halves

    Swapped one half of a 3400 case with another one due to crankcase seal problems with one half. However I can't get reassembled body to hold pressure. Continues to leak at area next to cylinder where halves meet and its difficult to tell exactly where the leak is. Tried new paper gaskets, even used a thin coat of Dirko HT, as well. Still no luck. Is it possible that you can't switch one half a case? I can't imagine they are machined as a pair but I'm strictly guessing. Even switched cylinders but still leaks. Any suggestions would be appreciated.
    Reply With Quote Reply With Quote
  2. 01-17-2009, 08:42 PM #2
    blsnelling
    blsnelling is offline
    Site Sponsor
    Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation
    Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation     blsnelling's Avatar
    Join Date
    Nov 2006
    Location
    Franklin, OH
    Posts
    38,295
    Credits
    1,789
    Crankcase halves are machined as a pair. They are not supposed to be replaced individually. Sorry.
    Brad - Snellerized Saws

    Have a 201T that doesn't run like you expected? Need a new one that's already modded and ready to go? PM me for details.
    Reply With Quote Reply With Quote
  3. 01-17-2009, 08:48 PM #3
    cuttinscott
    cuttinscott is offline
    Arboristsite MVP
    Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation
    Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation     cuttinscott's Avatar
    Join Date
    Mar 2003
    Location
    Greenwich, NY
    Posts
    3,045
    Credits
    152
    Quote Originally Posted by blsnelling View Post
    Crankcase halves are machined as a pair. They are not supposed to be replaced individually. Sorry.
    Unless its a Dolmar then you can use any year case as long as its the right part number.............

    Scott
    Reply With Quote Reply With Quote
  4. 01-17-2009, 11:57 PM #4
    Bill G
    Bill G is offline
    Arboristsite MVP
    Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation
    Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation
    Join Date
    Mar 2002
    Location
    Illinois
    Posts
    6,359
    Credits
    489
    Quote Originally Posted by blsnelling View Post
    Crankcase halves are machined as a pair. They are not supposed to be replaced individually. Sorry.
    I agree but Stihl sold them as individual parts.

    Bill
    Reply With Quote Reply With Quote
  5. 01-18-2009, 05:04 AM #5
    Saw Dr.
    Saw Dr. is online now
    Chainsaw Ph.D
    Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation
    Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation     Saw Dr.'s Avatar
    Join Date
    Oct 2007
    Location
    Temple, GA
    Posts
    5,268
    Credits
    1,344
    I have a 3400 with one crankcase half from the original saw and one from a craftsman. Get yourself a large piece of glass, and a large sheet of 320 or 400 grit sandpaper. Spray some 3m spray adhesive to the back of the sandpaper, and stick it to the glass. Then strip the cases bare, and sand them on the rig you just made. That should get them flat enough to seal. You will know when to stop when the gasket mating surface has a uniform apearance from sanding. If there are deep gouges in there from levering the cases apart, they're probably junk.
    Reply With Quote Reply With Quote
  6. 01-18-2009, 06:00 AM #6
    Modifiedmark
    Modifiedmark is offline
    Tree Freak
    Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation
    Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation     Modifiedmark's Avatar
    Join Date
    Dec 2007
    Location
    NW Indiana
    Posts
    13,806
    Credits
    6,672
    I have never swapped half a case,never needed to.

    I think Tim just gave some good advice if you do. (and it won't let me rep it!)

    I'm still trying to figure out how the seal area got wore out and the brg area is ok?
    Reply With Quote Reply With Quote
  7. 01-18-2009, 06:11 AM #7
    barneyrb
    barneyrb is offline
    Arboristsite MVP
    Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation
    Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation     barneyrb's Avatar
    Join Date
    Dec 2008
    Location
    Deep South
    Posts
    3,567
    Credits
    1,586
    Quote Originally Posted by B200Driver View Post
    I have a 3400 with one crankcase half from the original saw and one from a craftsman. Get yourself a large piece of glass, and a large sheet of 320 or 400 grit sandpaper. Spray some 3m spray adhesive to the back of the sandpaper, and stick it to the glass. Then strip the cases bare, and sand them on the rig you just made. That should get them flat enough to seal. You will know when to stop when the gasket mating surface has a uniform apearance from sanding. If there are deep gouges in there from levering the cases apart, they're probably junk.
    To carry this idea one step further, we used to eliminate head gaskets on YZ's by using valve grinding compound in the same manner on glass, just spread it out and true your piece.
    Reply With Quote Reply With Quote
  8. 01-18-2009, 07:37 AM #8
    stihl only
    stihl only is offline
    Senior Member
    Reputation Reputation Reputation
    Reputation Reputation Reputation Reputation
    Join Date
    Sep 2008
    Location
    PA
    Posts
    466
    Credits
    5
    To say that a case must be replaced as a complete case is way too general of a statement. It really depends on the saw.

    I can buy right and left cases for a 361, but some saws, you have to buy a complete case.

    It will depend on the saw being worked on and you can't just narrow it down by brand.
    Reply With Quote Reply With Quote
  9. 01-18-2009, 08:31 AM #9
    pioneerguy600
    pioneerguy600 is offline
    Tree Freak
    Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation
    Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation     pioneerguy600's Avatar
    Join Date
    Dec 2007
    Location
    N.S. Canada
    Posts
    25,430
    Credits
    17,469
    Sounds to me like there is some gaps there somewhere, if the case halfs are nice and flat/true there should be no problem sealing them up. I have personally repaired over a dozen chainsaws using case halves from donor saws, some are still running after 15 years from repairing them. Just have to be careful of the mating surfaces, no gouges ,nicks or cracks. JB weld can be used to fix any of the aforementioned conditions. IMO.
    Pioneerguy600
    Jerry Myers



    I know how to read instructions but I seldom follow them.
























    Its good to dabble in the sewer, you will really appreciate getting out.
    Reply With Quote Reply With Quote
  10. 01-18-2009, 08:59 AM #10
    blsnelling
    blsnelling is offline
    Site Sponsor
    Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation
    Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation     blsnelling's Avatar
    Join Date
    Nov 2006
    Location
    Franklin, OH
    Posts
    38,295
    Credits
    1,789
    I'd be concerned about the line-boring of the crank bearings as well. Obviously several of you are more informed on this than I am . I'm just passing along what I've read. I had a couple 440 saws with bad clutch side case halves. I pitched them.
    Brad - Snellerized Saws

    Have a 201T that doesn't run like you expected? Need a new one that's already modded and ready to go? PM me for details.
    Reply With Quote Reply With Quote
  11. 01-18-2009, 10:13 AM #11
    redunshee
    redunshee is offline
    Arboristsite MVP
    Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation
    Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation
    Join Date
    Oct 2007
    Location
    Texas, but spend time in Vermont
    Posts
    4,054
    Credits
    1,647
    Quote Originally Posted by blsnelling View Post
    I'd be concerned about the line-boring of the crank bearings as well. Obviously several of you are more informed on this than I am . I'm just passing along what I've read. I had a couple 440 saws with bad clutch side case halves. I pitched them.
    Crank seems to line uo perfectly. In fact whrn comparing original and borrowed half and mating to good side they both "appear" to look identical. maybe I'll try smoothing both sides out and see what happens.
    Reply With Quote Reply With Quote
  12. 01-18-2009, 10:14 AM #12
    redunshee
    redunshee is offline
    Arboristsite MVP
    Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation
    Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation
    Join Date
    Oct 2007
    Location
    Texas, but spend time in Vermont
    Posts
    4,054
    Credits
    1,647
    Quote Originally Posted by Modifiedmark View Post
    I have never swapped half a case,never needed to.

    I think Tim just gave some good advice if you do. (and it won't let me rep it!)

    I'm still trying to figure out how the seal area got wore out and the brg area is ok?
    One of those mysteries of life..........or I'm an idiot. The latter might be true.
    Reply With Quote Reply With Quote
  13. 01-18-2009, 10:18 AM #13
    redunshee
    redunshee is offline
    Arboristsite MVP
    Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation
    Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation
    Join Date
    Oct 2007
    Location
    Texas, but spend time in Vermont
    Posts
    4,054
    Credits
    1,647
    Quote Originally Posted by B200Driver View Post
    I have a 3400 with one crankcase half from the original saw and one from a craftsman. Get yourself a large piece of glass, and a large sheet of 320 or 400 grit sandpaper. Spray some 3m spray adhesive to the back of the sandpaper, and stick it to the glass. Then strip the cases bare, and sand them on the rig you just made. That should get them flat enough to seal. You will know when to stop when the gasket mating surface has a uniform apearance from sanding. If there are deep gouges in there from levering the cases apart, they're probably junk.
    Didn't lever the halves apart and they don't look too bad. Help me out here. What is the purpose of the glass and do you set the half case on the glass with sandpaper and move the case or vice versa?
    Reply With Quote Reply With Quote
  14. 01-18-2009, 01:17 PM #14
    pioneerguy600
    pioneerguy600 is offline
    Tree Freak
    Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation
    Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation     pioneerguy600's Avatar
    Join Date
    Dec 2007
    Location
    N.S. Canada
    Posts
    25,430
    Credits
    17,469
    Quote Originally Posted by redunshee View Post
    Didn't lever the halves apart and they don't look too bad. Help me out here. What is the purpose of the glass and do you set the half case on the glass with sandpaper and move the case or vice versa?
    The purpose of the glass is it is the cheapest form and readily available near perfect flat surface you can lay your hands on so when you stick your sandpaper to it and then rub your part to be evened up over it then a fairly flat area will be the result. Move the case if possible,leave the glass flat on the bench.
    Pioneerguy600
    Last edited by pioneerguy600; 01-18-2009 at 01:19 PM.
    Jerry Myers



    I know how to read instructions but I seldom follow them.
























    Its good to dabble in the sewer, you will really appreciate getting out.
    Reply With Quote Reply With Quote
  15. 01-18-2009, 01:39 PM #15
    Mad Professor
    Mad Professor is offline
    Arboristsite MVP
    Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation
    Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation
    Join Date
    Jul 2007
    Location
    North East USA
    Posts
    4,195
    Credits
    523
    Quote Originally Posted by redunshee View Post
    Swapped one half of a 3400 case with another one due to crankcase seal problems with one half. However I can't get reassembled body to hold pressure. Continues to leak at area next to cylinder where halves meet and its difficult to tell exactly where the leak is. Tried new paper gaskets, even used a thin coat of Dirko HT, as well. Still no luck. Is it possible that you can't switch one half a case? I can't imagine they are machined as a pair but I'm strictly guessing. Even switched cylinders but still leaks. Any suggestions would be appreciated.
    You can't do that, what Brad said post #2

    P.S. why change a crankcase half because you're too cheap to but a $5 seal?
    Last edited by Mad Professor; 01-18-2009 at 01:40 PM.
    Homlite 150, super XL (my first saws still running)

    Husky weed wacker

    Stihl:

    FS 66 (projects)
    BR 400
    020T
    026 s 1 runner, the other waiting for P/C kit
    028 super (rebuilt with OEM)
    036 pros (1 runner, 1 just rebuilt with OEM parts)
    038 supers (2 converted to 038M , the other waiting it's turn)
    038 magnum II
    056s (4, two spares for the mill (magnum) , 2 parts saws, not for sale)
    066 magnum (mostly for the mill)
    Logosol Mill
    Reply With Quote Reply With Quote
Page 1 of 2 12 LastLast
« Previous Thread | Next Thread »

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  

Forum Rules

Page generated in 0.27008 seconds with 43 queries [Server Loads: 1.66 1.46 : 1.43]