The purpse of valve lifters is exactly what it says, to lift the valve.
on a 98 ford taurus what are the symptoms of a bad hydralic valve lifter
The lifter's are all the SAME. the push rods are what is DIFFEERENT. Some are longer the the others. They MUST be put in the right place are you will bend a valve as soon as the engine turns over.
The lifter bucket, which is on top of the valve stem, and the spring in the Overhead Cam engine aides in adjusting the valve clearance.
It is to close the valve(keep it from bouncing/valve float)and keep the lifter on/followingthe cam. This is why race cams with radical lobes need 1000psi springs. The higher the rpm/ heavier the valvetrain the heavier the spring needed.
lifting somthing
It is cheaper than replacing the lifter
12
A noisy valve lifter can be a sign of insufficient oil flow or low oil pressure, which may cause the lifter to not function properly. The noise often diminishes as the engine warms up and oil circulates more effectively, reducing friction and allowing the lifter to operate smoothly. However, if the noise persists or occurs frequently, it could indicate a more significant issue that may require professional inspection. Regular maintenance and using the correct oil viscosity can help prevent lifter noise.
Valve lash needs adjusting or you have a lifter that is sticking.
You can tell a bad valve by doing a compression test.
Roller
take off the valve cover,remove the rockers,take off the intake manifold take out the push rods,then pull out the lifter,if the lifter is mushroomed you may need to get a lifter puller