timing chain specs

Discussion in ''Da Nailhead' started by gsgtx, May 15, 2018.

  1. gsgtx

    gsgtx Silver Level contributor

    is there a spec or any thing to go by for how much play a timing should have. whats to much ?
     
  2. rex362

    rex362 paint clear and drive

    if your looking at it directly and your asking ...?
    just throw a new set in there :) they are not expensive

    I remember there is a way to check by spinning by hand to tdc and then reversing rotation slightly and watching your rotor and
    then note how many degrees of movement on your pulley marks before the rotor starts moving .....but I forgot the amount of degrees allowed
     
  3. rex362

    rex362 paint clear and drive

    found one on you tube ...this guys says 7 degrees movement and you have to much slack
    but I imagine thats a general spec ....imo 4*-5* might be to much

     
  4. rex362

    rex362 paint clear and drive

    then again I imagine a very warn distributor gear could also give you a bad slack reading by watching rotor movement
     
    Last edited: May 15, 2018
  5. gsgtx

    gsgtx Silver Level contributor

    thanks for that good information, good to know. my mistake the timing cover is off and the dist is out. so am trying to get them specs by moving the chain side to side.should it move a 1/16 or 1/8 or 1/4 inch
     
  6. rex362

    rex362 paint clear and drive

    there will be some slack ........no slack and the chain could snap easily
    how do the teeth look on both gears ?


    again .....if your looking at it just change the chain and gears regardless ....:D
     
  7. gsgtx

    gsgtx Silver Level contributor

    well actually i can just put the damper back on and see from there
     
  8. gsgtx

    gsgtx Silver Level contributor

    they are new, well about a 100 miles
     
  9. Stevem

    Stevem Well-Known Member

    Even a the best new chain gives up 2 degrees instantly, so I always advance the Cam with a 2 degree key just for starters!
     
  10. 322bnh

    322bnh Well-Known Member

    May not be necessary if you find an old stock chain supplied in a long box (long box because that is the only way to fold). Current chains that fold into a ball in your hand will always be sloppy. 491 chains show up on ebay sometimes. This one was $20 a few months ago.

    timingchain.jpg
     
  11. gsgtx

    gsgtx Silver Level contributor

    already got a melling chain. was a little loose. ended up putting a timing chain tensioner on, plus a guide on the other side
     
  12. wkillgs

    wkillgs Gold Level Contributor

    I'm thinking 3/8"- 1/2" is typical for a new chain. I'll have to look thru my picture files...
     
  13. gsgtx

    gsgtx Silver Level contributor

    they get loose real fast. i had a single roller on it with 100 miles and it was loose. have to use a stock link chain with the tensioner wont work on the roller chain
     
  14. gsgtx

    gsgtx Silver Level contributor

    the timing would jump around with the timing gun, was hard to time it with a loose chain
     
  15. John Codman

    John Codman Platinum Level Contributor

    My rule of thumb on V8 timing chains is 5 degrees maximum. Just put the harmonic balancer mark on the pointer (or the reverse if the timing marks are on the damper) and with a breaker bar on the crank pulley move the crank back and forth. You will be able to feel the slack before the chain starts to move the cam. If the index or pointer moves more then about a total of 5 degrees of slack, you have just found a nice weekend project. BTW - I agree with those who say that if you are looking at the chain and it has any significant slack (or a nylon cam gear), replace it they are not that expensive.
     
    Last edited: May 31, 2018
    gsgtx likes this.
  16. gsgtx

    gsgtx Silver Level contributor

    i ended up putting a tensioner from competition products on it. used the guide on the other side. timing does not move around now when i time it with the timing light, seems like the engine has better throttle responds and smoother. didnt try wide open throttle yet
     
  17. telriv

    telriv Well-Known Member

    Any pics of the install???
     
  18. gsgtx

    gsgtx Silver Level contributor

    Tom it is the same one i put on before but with the guide this time. i have an old thread with the photos from the first time under timing chain tensioner
     
  19. gsgtx

    gsgtx Silver Level contributor

    feb 15th 2013 [timing chain tensioner] could someone please post that thread
     
    Last edited: May 29, 2018

Share This Page