Link to: WikiAnswers. Valve Tap. Why?
WikiAnswers valve tap.
Valve tap develops due to four reasons:
The hydraulic lifter sticks - there is one for each valve, by becoming plugged up with sludge. Or rather, inside the lifter is a piston that sludge will jam open. The valve lifter "pistons" job is to allow oil pressured to push it up so contact with the bottom of the valve stem occurs. This action takes up slack between the cam and the valve. When this little -but important valve-lifter piston is stuck open, or the oil delivery is blocked with sludge, oil cannot push the valve piston up, to close this gap. A space appears and causes the tap tap tap.
Residues collecting and sticking your motor's valve stems keep them it from snapping close as they should. A space appears and as the cam rotates and smacks the stem, tap tap tap is heard as it does so.
Carbon - residues from dirty combustion holds open your valve. Same problem as 3 occurs. And also rough idle, or stallingwill occur.
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