lost all oil pressure but not flow

Big Block A body Tech

  1. rustycowll69

    rustycowll69 Well-Known Member

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    what about clearance between retainer and valve guide/seal? what about possible coli bind?
    How many threads of adjuster are exposed under the rocker arm? You don't want too many, because that's not good, but you don't want too few either because the cup edge on top of pushrod may contact rocker bottom at extreme lift and come out of the rocker socket.
    There is one very remote possibility I can think of: if you had too high of an oil level the crank could whip the oil in the sump, and aerate the oil, collapsing a lifter. Conversely, if you pump the sump dry at high rpm's, you can collapse a lifter(among other things).
     
    • Disagree Disagree x 1
    • Heywodja

      Heywodja The Heartbeat Stops Here FABO Gold Member

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      Might have to check if the cam bearings are properly installed..there are holes for oiling that need to be properly aligned...
       
    • oldkimmer

      oldkimmer FABO Gold Member FABO Gold Member

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      Did u get this figured? Kim
       
    • rustycowll69

      rustycowll69 Well-Known Member

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      it's funny, I was just thinking about this thread, today. I just got my latest issue(September) of Hot Rod mag and they have a trouble-shooting story of a stroked RB engine, which has a reputation of breaking rocker arms, etc. It turns out the engine assembler mixed up two pistons, so that the eyebrows in the pistons were incorrectly matched to the particular valves in those cylinders. The intake valve(s) were colliding with the exhaust valve relief(s) in the pistons of two cylinders.
       
    • inertia

      inertia Well-Known Member

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      OP. Did you happen to miss a hairy shift and possibly over-rev it ? ?
      That would be a simple solution in my mind. Save a lotta speculating. jmo
      Been there, same result. lol
       
    • UDUST81

      UDUST81 Well-Known Member

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      hey update for everyone sorry i havent been back on much lately life getting in the way and all....
      new pushrod is installed and engine reassembled, havent driven it on the street but have ran it a few times in the driveway, oil pressure acts exactly the same as before and engine seems to run just as good, only thing i changed while reassembling was i changed my valve lash from what i originally set up with.

      i had read before that when breaking in a cold engine to set the valve lash .002 looser than what your hot lash will be, aparently this is true.... for an iron headed iron block, for an iron headed block with aluminum heads aparently you should set the lash .006 TIGHTER... so i did that and am seeing no issues so far...

      im hoping the issue possibly did just come down to an overev or possibly a faulty pushrod or myself just setting up the lash far too loose and beating up the valvetrain too much we will see when i actually have time i will run it for a good while and pull the valve covers and check my lash when hot

      BTW heres a good article i found about setting valve lash Valvetrain Tech: Lash Is Much More Than Just A Little Gap
       
    • inertia

      inertia Well-Known Member

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      Sounds like that would that be a "yes" - to an over-rev ? ?
       
    • yellow rose

      yellow rose Overnight Sensation FABO Gold Member

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      It's NOT true. I've never seen any engine loose lash as it warms up. Never. I don't know where that started, but I've never seen it happen.
       
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