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Old 05-04-2004, 04:05 AM
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Hydraulic Lifter Pump Up

I have just rebuilt my 350 Chev, but failed to fill the hydraulic lifters with oil. My problem is that now I cannot set valve lash correctly (no clearance between rocker & valve) and there is no compression. I have primed the engine oil, but this hasn't helped in reducing the pumping up of the lifters. Cam is about 230 dur. & .490 lift. The block has been decked .025".
Do I need to pull the lifters out and fill them with oil, or will priming the engine eventually fill them with oil (I have been told this will take a long time)? Thanx...

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Old 05-04-2004, 04:11 AM
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You will get some type of compression on the engine no matter what so long as the the valves are even opening a spec.

If you are getting no compression on a gauge with everything put together and cranking it over by key then there is something REALLY wrong there.

The hydraulic lifters will "pump" themselves up. Priming is not needed. Maybe when one of the chevy guys wake up then you can get a better answer.
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Old 05-04-2004, 05:17 AM
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How did you initially adjust the lash? Sounds like you bottomed out the pushrods in the lifter? Back them all off and readjust the lash @ 0 +1/2 turn down!
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Old 05-04-2004, 08:46 AM
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You can loosen the nut's untill they have about 1/16 of play between the roker tip and the valve tip. Then you can tighten the nut down 3/4 turn. That will get you really close to final adjustment.
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Old 05-13-2006, 07:47 AM
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I know this is an old post but closest I can find to my problem. BBC had a broken valve spring. Replaced via the air fitting holding things in place & then tried to set the valve lash. Carefully down to zero lash & then 3/4 turn further, zero compression. Backed off 1/4 turn & full 190#!! Whats going on, these are hydraulic lifters??? & we tried this several times so the pushrod did not bottom out the lifter plungers. We did not build this engine so unsure of the parts inside but its a 402 big block with 427 heads.
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