Quote:
Originally Posted by thstone
This is most likely a sticky hydraulic valve lifter (sometimes called a valve tappet). The hydraulic (non-adjustable) lifter replaced the old-style adjustable lifters where high pressure oil is pumped into the lifter to take up the slack between the valve and the cam.
The idea is that hydraulic valves/lifters are always in perfect adjustment - except when the lifter sticks and won't take up the slack - then you hear the valve tapping on the lifter because its out of adjustment.
To fix this, the cam cover has to be removed and the lifter repaired or replaced. This job is actually more complicated than it sounds because the cams need to be locked in place so the engine keeps timing and so they don't fall out when the cam cover is removed. Also re-sealing the cam covers can be a pain (there is no gasket, just sealant). When you're ready to learn all of the details you can do a search and find all you need to know. Its not an immediate need, but its also something that shouldn't be forgotten.
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Thanks so much for your help.
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