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Husqvarna 350/346 Repair Thread.

Discussion in 'Chainsaws' started by Onan18, Dec 11, 2017.

  1. Onan18

    Onan18 OPE Sponsor GoldMember

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    Here we go again everyone, this thread will document the general repairs and some basic mods to the Husqvarna 340/345/350/351/353/346 chassis as well as their Jonsered counterparts. I have a few 350s in the que for re-seal and 346 cylinder conversion as well as my Dads 346 for seal replacement and an intake track upgrade; so I will be adding to this thread as they come up in the rotation.

    On the bench is a 350, this saw came in for an erratic run issue characteristic of an air leak. It will be getting re-sealed as well as the intake clamp update, muffler support bracket added, carb kit, fuel line, etc...

    20171211_113850.jpg
    The victim.
     
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  2. Onan18

    Onan18 OPE Sponsor GoldMember

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    20171211_113925.jpg
    Start by removing the top cover.

    20171211_113949.jpg
    Clutch cover next.
    20171211_113953.jpg
    On this chassis the adjuster pin and tensioner screw are one piece. It works but is hard to get a screwdriver on. A good upgrade is a clutch cover assembly from a 455/460. You have to remove the tensioner from the case but otherwise it is a direct swap.
     
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  3. Onan18

    Onan18 OPE Sponsor GoldMember

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    20171211_113959.jpg
    Air filter next, the 346 is held on with a retaining wire.
    20171211_114003.jpg
    But on the other saws you just twist... 20171211_114008.jpg And off it comes.
    20171211_114012.jpg
    Little tip, use the top cover to hold your fasteners.
     
  4. Onan18

    Onan18 OPE Sponsor GoldMember

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    20171211_114031.jpg
    Front handle next, three screws on the side.
    20171211_114132.jpg
    And two on the bottom.
    20171211_114158.jpg
    Bottom screws are shorter, don't mix them up!
    20171211_114211.jpg
    Handle off.
     
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  5. Onan18

    Onan18 OPE Sponsor GoldMember

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    20171211_114225.jpg
    Brake flag next, one screw on the flywheel side... 20171211_114301.jpg And another on the PTO side.
    20171211_114308.jpg
    Screws have a shoulder for the flag to pivot on.
     
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  6. Onan18

    Onan18 OPE Sponsor GoldMember

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    20171211_114315.jpg
    Flag off.
    20171211_114320.jpg
    Here is the detent...
    20171211_114327.jpg
    It just pops out.
     
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  7. psuiewalsh

    psuiewalsh Basement Bodging

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    Should I call the number on the tag and tell him the saws done?
     
  8. Onan18

    Onan18 OPE Sponsor GoldMember

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    20171211_114340.jpg
    Muffler next, two 4mm Allen's.
    20171211_114401.jpg
    OEM mufflers have a part number stamped into them.
    20171211_114418.jpg
    And off, here is the order things go onto the cylinder.
     
  9. Onan18

    Onan18 OPE Sponsor GoldMember

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    20171211_114444.jpg
    Starter next, four screws.
    20171211_121106.jpg
    Here is how the wires route.
    20171211_121127.jpg
    Air deflector out.
     
  10. Onan18

    Onan18 OPE Sponsor GoldMember

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    20171211_121145.jpg
    Kill wires next.
    20171211_121156.jpg
    They come off like so...
    20171211_121204.jpg
    Pull them through the case and get them out of the way.
    20171211_121217.jpg
    Then the fuel line.
    20171211_121224.jpg
    Disconnected.
     
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  11. Onan18

    Onan18 OPE Sponsor GoldMember

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    20171211_121259.jpg
    This small wire retains the throttle linkage.
    20171211_121313.jpg
    Pop it out.
    20171211_121322.jpg
    Depress the throttle.
    20171211_121337.jpg
    Hold the throttle shaft open.
    20171211_121353.jpg
    Release the trigger and the throttle linkage will come out of the catch.
     
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  12. Onan18

    Onan18 OPE Sponsor GoldMember

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    20171211_121441.jpg
    Lift the throttle rod and bellows out as an assembly.

    There are two vibration dampeners that support the air filter base.
    20171211_121457.jpg
    One here...
    20171211_121503.jpg
    And one here.
    20171211_121512.jpg
    Release them.
     
  13. Onan18

    Onan18 OPE Sponsor GoldMember

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    20171211_121529.jpg
    There are two screws that hold the intake track on.
    20171211_121539.jpg
    You guessed it, 4mm Allen.
    20171211_121656.jpg
    Intake track comes off like this.
    20171211_121750.jpg
    Release the choke lever.
    20171211_121801.jpg
    And the carb comes out.
     
  14. Onan18

    Onan18 OPE Sponsor GoldMember

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    Clutch next, the tool for this is really inexpensive.

    20171211_122145.jpg
    But if you are in a hurry there are other ways.

    20171211_122156.jpg
    Catch the clutch and give it a couple of good smacks.

    20171211_122437.jpg
    And it will spin off.
     
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  15. Onan18

    Onan18 OPE Sponsor GoldMember

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    20171211_122441.jpg
    Clutch drum next.

    20171211_122443.jpg
    Don't forget the needle bearing.

    20171211_122456.jpg
    Wind the worm gear out.

    20171211_122506.jpg
    You can see how the cutout in the worm matches the drum, this is how the oil pump is driven.

    20171211_122531.jpg
    And this is as far as you have to go on this side.
     
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  16. Onan18

    Onan18 OPE Sponsor GoldMember

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    20171211_122558.jpg
    Loosen the flywheel nut and run it until it is flush with the end of the threads.

    20171211_122630.jpg
    A couple of sharp taps on the nut and the flywheel comes off, the key is cast in so you cannot lose it.

    20171211_122635.jpg
    You don't have to remove the coil for this job but if you do be sure not to lose track of the ground strap.

    20171211_122652.jpg
    Remove the cylinder bolts.

    20171211_122823.jpg
    And off.
     
  17. Onan18

    Onan18 OPE Sponsor GoldMember

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    There are two flex limiters for the anti-vibe.

    20171211_123016.jpg
    One here.

    20171211_123242.jpg
    And one here.

    20171211_123259.jpg
    The screws don't have threads on the end, they just push into the buffers.

    20171211_123310.jpg
    Which rest in these pockets, with the screws out they will pull free.
     
  18. Onan18

    Onan18 OPE Sponsor GoldMember

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    20171211_123337.jpg
    Fuel line routes through the case here.

    20171211_123350.jpg
    Remove the front A/V mount retainer screw.

    20171211_123454.jpg
    And the back one.

    20171211_123503.jpg
    Uh-Oh.

    20171211_123515.jpg
    That's not good.
     
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  19. Onan18

    Onan18 OPE Sponsor GoldMember

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    This is as far as I got today, I had to order a new A/V mount and I have a service school tomorrow. More to come soon...
     
  20. huskihl

    huskihl Sausage Lives Matter

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    I've seen a few 346's pull those threads out. Throttle is usually stuck about 1/2 open and inoperable. It's from getting the Bar pinched and yanking it out. Shove a piece of trimmer line in there and run the screw in. Or melt some trimmer line into the hole and re-drill it
     
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