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Husqvarna 50/51/55 repair thread.

Discussion in 'Chainsaws' started by Onan18, Nov 3, 2017.

  1. Onan18

    Onan18 OPE Sponsor

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    I have a couple of 55s in the que for work, so this thread is going to cover several different saws as I get to them.

    Today was a piston replacement, pretty standard job on these older saws.

    20171103_103214.jpg
    The victim.
     
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  2. Onan18

    Onan18 OPE Sponsor

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    20171103_103303.jpg
    Top cover off, pretty clean old saw.

    20171103_103350.jpg
    No signs of ingestion.

    20171103_103421.jpg
    Fuel line and three screws...

    20171103_103507.jpg
    And everything comes off as an assembly.
     
  3. coryj

    coryj Super OPE Member

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    Tag... I'll be following this thread. I have one laying on the bench that needs a new piston too.
     
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  4. Onan18

    Onan18 OPE Sponsor

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    20171103_103539.jpg
    Carb kit is always a good idea.

    20171103_103634.jpg
    Metering side.

    20171103_103658.jpg
    Check valve side.

    20171103_103802.jpg
    In the bath it goes.
     
  5. Onan18

    Onan18 OPE Sponsor

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    20171103_103822.jpg
    Two screws hold the partition on.

    20171103_103909.jpg
    I elected to leave the air horn on, the grommet just pulls off.

    20171103_103928.jpg
    Pull back and it is off.

    20171103_103937.jpg
    Common problem on these, the impulse grommet splits.
     
  6. Onan18

    Onan18 OPE Sponsor

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    20171103_104055.jpg
    Loosen the dog bolts.

    20171103_104107.jpg
    Two M8 nuts hold the muffler on.

    20171103_104150.jpg
    Support bracket will fold out of the way.

    20171103_104321.jpg
    And off.
     
  7. Onan18

    Onan18 OPE Sponsor

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    20171103_104326.jpg
    Do yourself a favor and get the half wrap out of the way.

    20171103_104457.jpg
    Cylinder bolts.

    20171103_105431.jpg
    Off.

    20171103_105519.jpg
    A small flathead screwdriver works well for removing circlips.
     
    Last edited: Nov 3, 2017
  8. Onan18

    Onan18 OPE Sponsor

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    20171103_112642.jpg
    Old ring measured 0.078" gap, keep in mind this saw ran.

    20171103_120335.jpg
    That's better, new ring measures 0.003"

    20171103_112649.jpg
    New Meteor from @Definitive Dave

    20171103_121521.jpg
    New base gasket and cylinder bolted back down.
     
  9. Onan18

    Onan18 OPE Sponsor

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    20171103_121543.jpg
    Muffler studs slide in from the side.

    20171103_121557.jpg
    Don't forget the exhaust gasket LOL.

    20171103_121612.jpg
    Muffler on.

    20171103_121656.jpg
    Bracket in place, tighten the nuts and dog bolts.
     
  10. Onan18

    Onan18 OPE Sponsor

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    20171103_122402.jpg
    These parts are maintaince items for this series IMO.

    20171103_122438.jpg
    New pulse pipe pushes in.

    20171103_122611.jpg
    Install the boot onto the partition.

    20171103_122810.jpg
    It can be a little fidgety, but it will push onto the cylinder.

    20171103_122616.jpg
    The partition comes with a plug to use with the non Air Injection models.
     
  11. Onan18

    Onan18 OPE Sponsor

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    20171103_124348.jpg
    Carb, linkage, and air cleaner base back on.

    20171103_124720.jpg
    And back together, start to finish took less than two hours even stopping to take pictures.
     
  12. Onan18

    Onan18 OPE Sponsor

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    Hope this proves helpful to someone, if anyone has any repair pictures of a saw from this series please feel free to add them.
     
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  13. USMC615

    USMC615 God...Country...Corps

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    Excellent thread Joe...appreciate taking the time for good pics and posting them!
     
  14. cus_deluxe

    cus_deluxe ONE OF THE WORST!!

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    Me too haha
     
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  15. Canadian farm boy

    Canadian farm boy 10,000 "likes" and still a fart knocker.

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    Lookin good Joe. Beautiful work as always my friend. I'm sure the saws owner is gonna be real happy.
     
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  16. PogoInTheWoods

    PogoInTheWoods Pinnacle OPE Member

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    Nice write up and pics. I've rebuilt a few of these, too. Have one on the bench today as a matter of fact needing a top end (of course).
    Got a NWP from DDave and was pleasantly surprised at the quality. Will need some very minor grinding to suit me a little better, but that's just me. I also usually do a vac/pressure test on the case and cylinder assembly (with the intake bulkhead in place) before committing to complete reassembly of the saw...., just because. Takes an extra 10 minutes and makes you feel a little more confident bolting the rest of it back together knowing everything is tight.

    Two easy mistakes can be made when replacing a top end on these. The first is pinching the impulse grommet while reassembling the intake bulkhead (partition) to the cylinder. As noted above, it's easiest to have the grommet in place in the cylinder and the intake sleeve on the bulkhead for things to go together easily..., starting at an angle with the impulse tube going into the grommet first and rocking the bulkhead upward to work the intake sleeve onto the intake flange of the cylinder. Attempting to push the bulkhead straight into place has a high probability of not making the desired connection between the impulse tube and grommet.

    The second mistake is hamfisting or cross-threading the carb bolts into the bulkhead threads causing a major air leak. Easy fix is heli-coils and some long 5mm cap screws or salvaged Stihl carb studs pressed in from the back. I've also seen ground down t-nuts used from the back with long cap screws. The one thing that won't work as a longterm solution is trying to use plastic weld or melt the plastic to re-thread the partition with the self tapping screws. It was a bad design idea to begin with. Trying to re-create it after it already failed is a worse one!

    Anyway, love these little saws. Great saw for a first-timer's rebuild. Great firewood saws. A gazillion of em out there. Inexpensive parts are everywhere. A guy who knows what he's doing can salvage a basket case 55 in a couple hours as detailed here and save a customer a lot of money at the same time. Plus they're great runners and tough as nails.

    These have all found new homes and I have four more around here somewhere besides the one on the bench. Always seem to find em and bring em home with intentions of rebuilding em to live another day. Usually do.



    1-0518141212a.jpg
     
    Last edited: Nov 5, 2017
    kyle.kipple, smokey7, M2theB and 11 others like this.
  17. Onan18

    Onan18 OPE Sponsor

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    Thank you for sharing your insight and experience sir. This is exactly what I was hoping for. As you said this chassis is great for a first time project and they are an excellent first saw.
     
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  18. huskihl

    huskihl Sausage Fingers Forever

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    Bought a 51 new in 1993. Still have it. Still all original everything. Runs like a top. Great saws
     
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  19. malk315

    malk315 Running Saws for Therapy

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    Good morning Joe-

    Back in February I rebuilt a 51 with 55 open port piston/cylinder kit (OEM) and new bearings / seals / lines / gaskets and did the heli coils for the intake bulkhead. Only thing that didn't get done was carb rebuild but the carb has been perfect. Went with no base gasket and muffler mod to make it an open can on the inside. She sounds great and the owner loves the saw. Here's the thread:

    http://opeforum.com/threads/husky-51-saw-build-project.6305/

    Cheers.
     
  20. Onan18

    Onan18 OPE Sponsor

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    Thanks Eric, great thread, I had read it back when you first posted but had forgotten all about it. I guess that makes this thread a little redundant. :BangHead:
     
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