http://www.ehow.com/how-does_5006538_hydraulic-valve-lifters-work.html
All engines have hydraulic valve lifters in one form or another.
http://www.ehow.com/how-does_5006538_hydraulic-valve-lifters-work.htmlQuote from: ehowAll engines have hydraulic valve lifters in one form or another.
Ok now I'm confused, I just cranked it over without starting it and the lifters all pumped right up to where I couldn't compress 'em at all. After a minute or two of sitting they started loosing pressure and I could squish 'em a tiny bit.
Even the ones that weren't compressed by the cam started flattening after sitting.
I might just be worried about nothing but these crazy lifters have me all mixed up. With solid lifters you can slide a feeler gauge in and know how much gap there is. With these goofy things I can't fit any feeler gauge without compressing the lifter and sliding the feeler in, even then it squeezes the feeler gauge tight for a little while.
What is normal?
R.O.R. it sounds like you are saying that the amount of lash is dependent on the oil pressure. That is not the case with properly functioning hydraulic lifters. There is a valve in the lifter that allows a certain set amount of lash and once that lash is achieved the valve is closed and the lifter becomes solidly filled with fluid. The lifter needs to have a good flow of oil but will function properly and maintain a constant lash down to virtually zero pressure. There are cases where extremely high abnormal oil pressure (stuck pressure relief valve) can cause the lifters to over-extend, but under the entire range of normal oil pressure with properly functioning lifters, the valve lash will remain constant both at idle and at the highest pressures seen.
So this nonstarting issue is rearing it's ugly head again.
Here's the deal, when flattened the lifters DON'T hold any valves open, when I first flattened the lifters and reinstalled 'em I could hear ALL four cylinders working properly.
Since then though the engine never likes to start, even when it has just been ran it takes a bit of cranking to get it to fire up. And during that cranking I can hear that not all cylinders are developing full compression........and the longer I crank it the worse it gets.
So I'm looking at new lifters, cheapest I can find are $9.11 each. Anyone know of a cheaper place?
While I'm waiting on the new lifters I thought I'd take the head off and shorten the valves stems so I can KNOW that it isn't the problem anymore.