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Husqvarna 2100 scored piston.

Discussion in 'The Repair Shop' started by Newman, Nov 8, 2019.

  1. Newman

    Newman OPE Member

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    Disaster has struck my big Husky chainsaw which I acquired 10 years ago. I am new to your site, but have seen a lot of expertise available to members seeking help and opinions in situations like my current dilemma. As you say, "find out why it failed before you just start putting in new parts". Please see attached pictures. It appears to me that the saw was running plenty rich, looking at the spark plug deposits and the carbon on the piston top. The fuel line is in poor shape, some cracks. I had not used the saw in about a years time..new fuel was just mixed before using the saw on this day. The saw was running great after about 5 cuts through a 3 foot diameter cottonwood log. Then it lost power and would not rev up, the fuel tank was about half full, I suspected the crack in the fuel line which I didn't discover until I disassembled the saw, may have become exposed in the half empty tank, thus causing fuel starvation, lean mixture and resulting piston scoring. But the damage to the piston and rings looks more like (foreign object damage) than heat damage. Scoring is all the way from top to bottom, and the steel rings did cut some tiny grooves in the hardened cylinder wall. I have ordered a new piston from the DLA site in Greece. Plus a new fuel line. Any opinions on what else I should check or change before destroying another piston? I think this is a 1979 saw, not sure, since it is also an early XP model.
    Thanks for all your help.. IMG_1830.JPG IMG_1835.JPG IMG_1839.JPG IMG_1841.JPG IMG_1842.JPG
     
  2. KYsawman

    KYsawman MR. XL-12

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    I would definitely do a leak test with vacuum and pressure on the crankcase seals, it is an old saw the seals don’t last forever, many of the old Homelite saws that I have acquired have been scored by bad seals. I would also replace fuel lines and carb kit. Have you already cleaned the cylinder in the picture above? It still looks like it may have aluminum on it. Is the plating damaged on the cylinder? If so new piston will be toasted in sort order.
     
  3. Newman

    Newman OPE Member

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    That sounds like a good idea on doing a vacuum and pressure test. I will search the forum for the proper technique. The inside of the cylinder was cleaned with hydro-chloric acid, then lightly rubbed with 500 grit emery paper. I believe those vertical lines are scratches instead of ridges. They most likely have penetrated into the plating, not sure how thick the plating goes, but none of the plating is flaking loose. The rings also appear to have been scratched, so what ever did the damage must have been pretty hard. I don't know if any carbon deposit or other type of corrosion chemistry could have produced such a hardened foreign object. I'm still guessing it was not caused by excess heat from a lean mix, but from (FOD). But of course I don't have much experience on this subject. I certainly appreciate your expertise. Many Thanks. IMG_1833.JPG
     
  4. srcarr52

    srcarr52 We can't stop here, th1s is bat country!

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    No, that is classic lean seizure.

    Foreign objects would have left a lot of indentations on the piston crown and squish band, if it was super fine dust it would have worn the plating out on the intake side.
     
  5. Newman

    Newman OPE Member

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    You guys are starting to convince me.. The cracked fuel line, and old rubber parts in the carburetor must be contributing factors. A carb kit and new fuel line along with the new Greek piston and rings are on the way. I believe the new piston will have a different skirt, not the open windowed design on this original one. Will that change anything?
    Thanks again..
     
    Definitive Dave likes this.
  6. Al Smith

    Al Smith Pinnacle OPE Member

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    Seals,clean the cylinder it will probably be okay .On the fuel line find either an OEM molded line or after market .Myself being a tight wad tried a combination of hoses which always leaked and damned if I didn't manage to set the thing a fire .Now that will give you a wake up call .
    I found an after market fuel line from MFG supply in Wisconsin ,about 20 bucks .Money well spent
    The piston most likely is toast but pictures could be deceiving .Some times you can sand them out,some times not .If so normally a low spot might be okay but a high spot will break through the oil film and the end results will be exactly how it is now .
    All that said those are good old saws if you can get them started .
     
  7. Newman

    Newman OPE Member

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    Thanks for the help. I have ordered a Proline molded fuel line from Ebay-$12.95 The cracked fuel line most likely led to fuel starvation or leaning out the mixture? I have a carb kit to install and, I'm also getting a Mityvac tester. The piston is coming from Greece, not sure who the mfg. will be, most likely someone in Asia. I will let you know if I'm impressed or not. Regards,
     
    Definitive Dave likes this.
  8. Al Smith

    Al Smith Pinnacle OPE Member

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    I'd suggest using either the OEM cir clips or Stihl clips because often times the after market ones are not that good .
     
  9. Newman

    Newman OPE Member

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    I'll try to find some genuine ones. Thanks for the suggestion
     
  10. EvilRoySlade

    EvilRoySlade What’s my line?

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    If fixing it becomes more than you care to deal with I would be interested in buying it from you.
     
  11. Newman

    Newman OPE Member

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    Thanks for the offer, I am 75 years and counting. May have to give up one of these days, but not just yet.. I bought it 10 years ago from a guy that was 84.
    Jack Slade the stagecoach robber from Virginia Dale, Colorado is just up the road from me. I think he was the name sake for the movie Evil Roy Slade. You probably already knew this. Have a good week-end.
     
    Billy Currie and EvilRoySlade like this.
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