Hydraulic Lifters Explained
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- čas přidán 9. 12. 2023
- I cover the workings of a hydraulic lifter in an OHV engine. I cover pump-up and some interesting stuff you may well not know about. (inc missing audio from previous posting)
- Auta a dopravní prostředky
thanks - this is great. on a hydraulic roller lifter (as in a pushrod chev V8 OEM application), i assume the depth or preload is the same? i have measured the adjuster nut travel, and it differed from your numbers. With a .375" rocker stud, 1 full turn was .040". in my application, i was doing the 1/2 turn preload and the rocker arms kept backing off. i measured .0200" plunger travel and i am now assuming that .020" preload was the problem. thanks again - enjoyed your lecture!
Very, very good presentation , thank you!
Glad you enjoyed it!
Very simple and straight forward on explaining hydraulic lifters. God bless sir. My car developed a tick sound. I opened the valve cover driver side and noticed cylinder #1 intake rocker loose. I tightened the bolt till zero lache. Started the car. ticking sound quit for 30min then came back. Wonder if I need to takeoff lower intake for more inspection. Could it be a failed lifter?
well you need to check a few things. Firstly you adjusted to zero lash, but did you tighten a further 3/4 turn. If you did & rattle came back, then check the bolt/nut has not unwound itself from where you set it. If all is OK with the first two, then you may have a blockage of oil flow into the lifter which probably may show up as lack of oil in the rocker fulcrum. If there is plenty of oil then it may be the lifter itself. A bottler of lifter free from wynn's or similar may remove any junk blocking the lifters.
Can you explain hydraulic lifters without the spring? I have them in my 83 cougar 5.0
They start out pushed down. It's like a spring on the opposite side.
There is a spring there as per my video. When you turn the engine off, over the next few minutes the lifters that are in contact with the lobe area of the camshaft will bleed down. The valve spring is much stronger than the internal spring of the lifter. Over the next few revolutions of the engine while starting, the lifters will bleed up with oil pressure taking up the clearance created by the bleed down. The ticking noise you hear for a second or two on start up is this process.
Do you need to prime hydraluic lifters before installing them? (Working on 1989 mazda b2200 mini truck)
You don't have to but you can prime them. Put some oil in a container deep enough to submerge the lifter. Put lifter in and using a pushrod or something blunt, push the lifter in & slowly release it. Repeat until lifter is close to solid. Then install into engine.
I have a strange problem...
Chevrolet optra 2008...
I have a lifter tick only when engine is warmed up....when cold everything is well quiet..... what's the problem please !!
To start with, I am not at all familiar with your engine, so have no idea whether you can adjust the lifters or not, but in theory hydraulic lifters all work the same. Oil pressure + the internal spring is what keeps the adjustment at zero lash. So make sure your oil is changed regularly & you use the correct oil for your climate conditions. For a lifter to rattle it is obviously not pumping up correctly. Causes can be as said bad oil or incorrect grade (to thin), check valve in base not sealing off but is OK when oil is thick (cold engine), adjustment (if adjustable) is borderline loose. You could try a oil additive called 'lifter free" or something like that, run it for 15-20 min & then change the oil & filter. If the problem is still there, then narrow it down to which lifter it is or just replace them all.