Register now to get rid of these ads!

Technical Spinning push rod?

Discussion in 'The Hokey Ass Message Board' started by dumprat, Jun 10, 2021.

  1. dumprat
    Joined: Dec 27, 2006
    Posts: 3,069

    dumprat
    ALLIANCE MEMBER
    from b.c.

    I have a new set of hot heads adjustable push rods, new lifters, and a reground cam. I have one pushrod that spins like crazy! It's a little noisy but I have never seen anything like this.
     
    Stogy likes this.
  2. 7564FE92-6FD1-4DAB-9EA0-C783BDEC8F9C.gif

    Is it adjusted the same as the others ?

    have you compared it to another pushrod ? Could it be machined or ???? Something wrong and be defective.

    how much faster is it spinning ?

    On what cylinder ? Intake or exhaust ? Bad slightly collapsed or shorter push rod ?

    I dunno man I’m just throwing stuff out there strange issue you have .

    observation will be the key to success on this one !
     
    Stogy likes this.
  3. dumprat
    Joined: Dec 27, 2006
    Posts: 3,069

    dumprat
    ALLIANCE MEMBER
    from b.c.

    Exhaust. Everything looks to be ok. Wonder if the cam has a little too much ramp or something?
     
    Stogy likes this.
  4. Mike VV
    Joined: Sep 28, 2010
    Posts: 2,346

    Mike VV
    Member
    from SoCal

    The spinning lifter is causing the pushrod to spin.
    It's not the "ramp" that may be excessive, but the angle that the lobe is ground at, that "makes" the lifters spin.
    Could that lobe have too much angle...don't understand how, but most anything is possible.

    I'd give that lifter a check every now and again to make sure that it's in good shape and not eating itself and the cam lobe.

    Mike
     

  5. Let Hot Heads know what's happening.
     
    brushwolf and Stogy like this.
  6. dalesnyder
    Joined: Feb 6, 2008
    Posts: 442

    dalesnyder
    Member

    If you have 15 pushrods that don't spin, you need to start planning your next engine rebuild.
     
  7. finn
    Joined: Jan 25, 2006
    Posts: 782

    finn
    Member

    The cam lobe is causing the spin.

    Move the pushrod in question, and I suspect the spin will stay with the lobe, not the pushrod.

    If it stays with the lobe like I suspect, try a different lifter.

    The other possibility is that the lifter bore isn’t parallel to the others.
     
  8. Truckedup
    Joined: Jul 25, 2006
    Posts: 4,070

    Truckedup
    Member

    pushrod spin is a result of lifter spin caused by the crown on the lifter face, the lobe design and most engines have the lifters offset to the cam lobe...
     
  9. dumprat
    Joined: Dec 27, 2006
    Posts: 3,069

    dumprat
    ALLIANCE MEMBER
    from b.c.

    Not exactly easy to check on. I will move the pushrod and see what happens.
    They all spin slowly, just this one is way faster. The engine isn't broke in, I'm hoping it will calm down. Lifters seem noisy at this point too.
     
  10. I need some of you Lifter Scientists to school me as needed.
    Is a bad lifter that doesn't pump back up as fast as the other "normal" ones also a possibility??
    I'm wondering if that's why it checks out when it's adjusted with the engine at rest, but noisy and possibly loose when under operating load.
     
    Last edited: Jun 11, 2021
  11. 1971BB427
    Joined: Mar 6, 2010
    Posts: 6,762

    1971BB427
    Member
    from Oregon

    The looser the adjustment, the faster a lifter/pushrod will spin. If one spins more than others, it's likely got more lash than the others.
     
  12. dumprat
    Joined: Dec 27, 2006
    Posts: 3,069

    dumprat
    ALLIANCE MEMBER
    from b.c.

    @1971BB427 that sounds reasonable. I am going to try a more scientific method of adjustment tomorrow.
    Set the pushrod to slight drag, then put .020 preload with a dial indicator to measure it.
     
  13. 1935ply
    Joined: Oct 21, 2007
    Posts: 170

    1935ply
    ALLIANCE MEMBER
    from peyton,co
    1. H.A.M.B. Chapel

    The hydraulics I set with a dial indictor at .050 - .060. If you were comparing it to a small block that would equal the one turn that is a common adjustment. The slow turning of a lifter is to keep them and the lobe from wearing.
     
  14. 1971BB427
    Joined: Mar 6, 2010
    Posts: 6,762

    1971BB427
    Member
    from Oregon

    Yes, don't get them too tight! If they don't turn much, they'll wear out, not oil properly, or not let the valve fully close.
     
    loudbang likes this.
  15. dumprat
    Joined: Dec 27, 2006
    Posts: 3,069

    dumprat
    ALLIANCE MEMBER
    from b.c.

    Dodge spec on the lifters is .050-.090
     
  16. Joe Travers
    Joined: Mar 21, 2021
    Posts: 253

    Joe Travers
    Member
    from Louisiana
    1. H.A.M.B. Chapel

    What weight oil are you running? Lifters like a multi-weight oil, like a 10W-40. I prefer Lucas Hot Rod for high zinc content.

    Joe
     
    loudbang and Chicster like this.
  17. Budget36
    Joined: Nov 29, 2014
    Posts: 6,378

    Budget36
    Member

    Curious on the pushrods wearing if they don’t turn, what happens with a roller lifter and the pushrod?
     
  18. Great question
     
  19. Jmountainjr
    Joined: Dec 29, 2006
    Posts: 1,354

    Jmountainjr
    ALLIANCE MEMBER

    The pushrod spin is a result of the lifter spin. Flat tappet lifters need to spin so as not to wear the cam lobe. Roller lifters don't need to / can't spin.
     
    loudbang and Desoto291Hemi like this.
  20. Budget36
    Joined: Nov 29, 2014
    Posts: 6,378

    Budget36
    Member

    I guess my question was more in regards to replies that indicated the pushrod needs to spin or it will wear.
     
    klleetrucking likes this.
  21. dumprat
    Joined: Dec 27, 2006
    Posts: 3,069

    dumprat
    ALLIANCE MEMBER
    from b.c.

    Got it sorted today. Did a careful job of setting the valves and gave them one full turn of preload. About .030. It seems to be about right. I had a couple set with more than that and that bank of cylinders got noisy.
     
    loudbang likes this.
  22. dumprat
    Joined: Dec 27, 2006
    Posts: 3,069

    dumprat
    ALLIANCE MEMBER
    from b.c.

    Btw ford small blocks with roller lifters used hardened pushrods in cop cars and taxi cabs. They actually wear the rockers out. Mustangs got soft shit pushrods.
     
    loudbang likes this.
  23. dumprat
    Joined: Dec 27, 2006
    Posts: 3,069

    dumprat
    ALLIANCE MEMBER
    from b.c.

    Shell rotella 10-40. Engine runs at 60psi constant. It's running over the relief valve.
     
    Joe Travers likes this.

Share This Page

Register now to get rid of these ads!

Archive

Copyright © 1995-2021 The Jalopy Journal: Steal our stuff, we'll kick your teeth in. Terms of Service. Privacy Policy.

Atomic Industry
Forum software by XenForo™ ©2010-2014 XenForo Ltd.