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In general they leak hydraulic brake fluid when they go bad.
Low oil level or pressure Hydraulic lifter bad
A tapping noise is generally the result of a bad hydraulic lifter, plugged oil passage to the lifter, or bad tappets. Sometimes just changing to lower viscosity high detergent oil will cure it. Or "Any automotive oil additive with the word MIRACLE in it".
on a 98 ford taurus what are the symptoms of a bad hydralic valve lifter
Probably not, a 2001 Windstar usually has hydraulic lifters that never need adjusting it could be a bad valve spring, or a bad lifter that will need to be replaced.
You can't fix a bad lifter, replace the bad lifter with a new one.
it´s possible that a bad hydraulic lifter is working dry.
You can change just the one lifter, however you should determine why it went bad. The intake manifold must come off to get to the lifter. Is there advanced mileage? do you change the oil regularly? Seeing how it is an 87 vehicle, with 19 years of use on the engine, I would strongly suggest changing the full set. Be carefull though as there is the possibility on that engine of 2 different size lifter bores. If yours are oversized it will be stamped on the lifter bore (not on the lifter) 0.25mm 0.5 There should also be a white paint mark at the bore.
This is a toughie. First you have to decide which lifter it is then pull the rocker cover and find the rocker arm that has play in it. Then look at the lifter and where the push rod rides should be stuck down further in the lifter bore than the rest. Or press down on the inside and if it goes down over 1/8 inch and is springy the lifter is bad.
Depends on how the lifter has failed. In most all cases you will have loss of power and there may or may not be a ticking or tapping noise. There will be a "misfire" in the cylinder that has the bad lifter, There is loss of fuel economy. The car will fail emissions testing.
there is no common part on a snowblower known as a lifter, more info is needed
A normal ticking is the fuel injectors opening and closing, a very loud ticking with bad mileage and poor performance may be a sticky lifter, aka hydraulic valve lash adjuster. If the latter try something like Marvel's Mystery Oil or another sticky lifter nostrum before launching into a difficuly and expensive replacement.