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2071 piston to rod contact?

Discussion in 'Chainsaws' started by Huskygasaxe, Mar 13, 2018.

  1. Huskygasaxe

    Huskygasaxe Well-Known OPE Member

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    Started tearing down a burnt up saw and found that the crank rod had been contacting the inner part of the piston. What would cause this. Crank rotation seems good and the lower rod bearing seems normal to me. Has the crank separated?
     
  2. Huskygasaxe

    Huskygasaxe Well-Known OPE Member

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  3. Dub11

    Dub11 Some body poisoned the watering hole!

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    Bad crank bear or piston bearing letting stuff flop around. Whats the big end of the con rod look like?
     
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  4. Huskygasaxe

    Huskygasaxe Well-Known OPE Member

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    Thank you for your reply. It feels tight. I better investigate further
     
  5. beaglebriar

    beaglebriar "I have a potty mouth" + GFY

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    Any signs of contact in the crankcase?
     
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  6. Dub11

    Dub11 Some body poisoned the watering hole!

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    I got this big bearing right here to a replace at work tonight when spinning it by hand it feels great when there is about 1700 PSI on it doesn't look so good. Sometimes stuff gets funky under load.
    1520985438607536924690.jpg
     
    Last edited: Mar 13, 2018
  7. Adirondackstihl

    Adirondackstihl Vert Da Furk........Bork Bork Bork

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    Lets start here.....
    Has the saw ever been apart to your knowledge? A saw you’ve owned for a while or recently acquired?
     
  8. Jon1212

    Jon1212 Birch! Please..... Staff Member

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    @Huskygasaxe just picked it up this week, along with a couple of other saws.
     
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  9. Adirondackstihl

    Adirondackstihl Vert Da Furk........Bork Bork Bork

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    I’m gonna say bad crank bearings, the crank was not centered or the big end bearing is shot.
     
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  10. Chainsaw Jim

    Chainsaw Jim #fartedinthebandwagon

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    Regardless what caused it you're gonna need to replace the bearings and likely the crank too. You'll be able to get a better look at things after you split the case.
     
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  11. Huskygasaxe

    Huskygasaxe Well-Known OPE Member

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    Hello.Slowly getting it apart. I am ready to split it soon. Taking my time as it is my first saw of this series I have worked on. The saw came from a small camp ground and had little use. By the look of the cylinder,bad gas or a dirty carb did it in. Hopefully get it apart tomorrow. The crank bearings do seem tight and feel as they should. Maybe under load they are toast. The wrist pin bearing was very hard to remove and definitely had seen some heat. I will post some more pictures. I decided I am going to replace the crank and bearings. These saws are hard to find here and I want it to last. Was disappointed when I popped the flywheel and found it the magnet for the heated handle ruined! Oh well still happy to have it.
     
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  12. Adirondackstihl

    Adirondackstihl Vert Da Furk........Bork Bork Bork

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    How was the magnet ruined?
     
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  13. Huskygasaxe

    Huskygasaxe Well-Known OPE Member

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    An inch was missing... I didn't think of this but that would of been terribly out of balance. Hard on bearings
     
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  14. Huskygasaxe

    Huskygasaxe Well-Known OPE Member

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    6EECBAE6-FD3F-4228-9934-E0991B7794BE.jpeg 3B98BFFA-86E1-4ECC-A129-EF9CB8EFA6AF.jpeg 37EF0B90-F3D5-49C6-8570-F40A1E27CF20.jpeg Got it apart. Clutch side bearing looks like it has spun. Case has some light scratches, not sure if it is junk. It does not feel to bad but I’m not sure if it will hold a new bearing or just spin again. Crankshaft looks wide at lower rod bearing. No marks showing crank contact to case halves. Am I ok to reassemble with new crank and bearings? Is the crank maybe ok? Thanks for the help, I have never had a saw with a crank failure.
     
  15. Huskygasaxe

    Huskygasaxe Well-Known OPE Member

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  16. beaglebriar

    beaglebriar "I have a potty mouth" + GFY

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    Looks like the bearing pocket is ruined. Crank is probably ok as long as the lower bearing is good.

    If it was the flywheel side I could hook you up...Post a want ad in the classifieds someone will have what you need.
     
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  17. Huskygasaxe

    Huskygasaxe Well-Known OPE Member

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    I don’t want to come off as to much of a bush mechanic but can a person use loctite bearing retainer or is it a terrible idea?
     
  18. Dub11

    Dub11 Some body poisoned the watering hole!

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    That and take a punch and put a bunch of divits in that bearing pocket to try and grab the bearing.
     
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  19. beaglebriar

    beaglebriar "I have a potty mouth" + GFY

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    That's totally up to you. I don't have enough experience with it to form an opinion. HL had China cases on sale the other day for 30 bucks.
     
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  20. Adirondackstihl

    Adirondackstihl Vert Da Furk........Bork Bork Bork

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    Yes you can, I’ve done it with great success.
    Preferable to me over dimpling or knurling the case.
     
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