Chain Tensioner check out this auto chain tensioner

Discussion in 'Transmission / Drivetrain' started by masterx1234, Jun 13, 2011.

  1. masterx1234

    masterx1234 Member

    i just bought an auto-chain tensioner from ebay, this thing is well made!, you can get one here: http://bit.ly/jk15ht

    also heres pics of mine"

    SUNP0054.jpg


    SUNP0056.jpg
     

  2. RedBaronX

    RedBaronX Member

    looks easy enough to duplicate
     
  3. tone2crazy

    tone2crazy Member

    definately. now i've got a project for the weekend. :whistling:
     
  4. BoltsMissing

    BoltsMissing Active Member

    Let us know if you have trouble with the swivel after a few rides, there is a suggested tip to render it.
    had to modify mine and worked a charm afterwards.
     
  5. BoltsMissing

    BoltsMissing Active Member

  6. RedBaronX

    RedBaronX Member

    it looks though that if the swiveling arms loosens up, it would just drop down that big long slot. THAT would be catastrophic...
     
  7. masterx1234

    masterx1234 Member

    the swivel arm has a locking washer sandwitched between two locking bolts, and the its free swiveling, means its not turning or affecting the bolt holding it together
     
  8. BoltsMissing

    BoltsMissing Active Member

    It's not about the bolt to be precise. It's about the arm's side clearance. It gets side slack. With a needle roller thrust bearing, it can be tightened up to zero tolerance, locked in place and get a smoother action.
     
  9. motorpsycho

    motorpsycho Active Member

    that looks like the cheap stock chain tensioner, with a peice of flat steel, drilled and bolted to it with a spring and a cable clamp added.

    I made one out of a tensioner to convert a 10 speed to a single speed bike. the tensioner i used takes place of the derailer on a 10 speed. it has an aluminum arm, with a steel shaft, brass bushing, and a steel derailer type gear. it cost me $15.00, and about an hour to modify it to fit my bike. i would rather it have a bearing than the brass bushing, but i keep it greased and it shows no signs of wearing out. it's been on my bike for 2 years now.
    here's what i bought :
    http://cgi.ebay.com/DH-DOWNHILL-FRE...Cycling_Parts_Accessories&hash=item45fb1888ee

    here's what i made it into:
    [​IMG]
     
    Last edited: Jun 14, 2011
  10. RedBaronX

    RedBaronX Member

    doesn't mean that it won't loosen up
     
  11. masterx1234

    masterx1234 Member

    a quick question, why is your chain tensioner on the top chain?
     
  12. TREEWK

    TREEWK Member

    Have Been Using "shoulder Bolts" In Mine With No Problems. You Can also Buy Bronze Bushing For Shoulder Bolts With Or Without A Collar.

    Star Washer/washer`s Can Be Added To One Or Both Side`s Of Threaded Part Of Shoulder Bolt for added locking in position. Shoulder bolts Cost A Couple Bucks. Many size`s and lengths available.

    Get mine from "Mc Master Carr.com" . Shipping is less than $5. for most of my orders, often have order the next day UPS.

    As you can see in the pic, you can just buy the bushing to match the thickness of you tensioner metal and space it with washer`s for chain or belt alignment. Many hardware stores may stock them. If you don`t burn over a gallon of gas !! lol.

    Ron
     

    Attached Files:

    Last edited: Jun 15, 2011
  13. motorpsycho

    motorpsycho Active Member

    because it does the same on the top as it does on the bottom.
    it really doesn't matter where the tensioner is located as long as it keeps tension on the chain.
    I have never had an isdsue with it, and i have never had a chain come off or loosen up on me.
    on my other bike the chain tensioner is another one that i made and it's actually a slider block. the chain slides across the block holding tension on the chain. i made it so that it's hidden and adjustable. it has been on my other bike for a year now and it works great. It's made out out heavy nylon / delrin plastic and i drilled a hole in it to hold grease. so as the block wears, grease will automatically get onto the chain. the top of the chain slides against the bottom of the block. the block is positioned so that it holds tension against the chain. sure, you can buy all kinds of chain tensioners, but i like to make my own parts.
    [​IMG]
    [​IMG]
     
  14. masterx1234

    masterx1234 Member

    the swivel arm cannot move down because its in a drilled hole explained in this picture swivel arm.jpg
     
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