Wikianswers valve tap.
Why do my engine valves tap?
What additive ends the tap permanently.

Story from Wikianswers valve tap

Link to: WikiAnswers. Valve Tap. Why?

End the four causes of engine tapping.

Tapping occurs when one or more of the following negatives occur:

  1. Inability of oil to lower high internal temperatures to weaken oils hydraulic effect.
  2. Inability of oil to make combustion escape.
  3. Inability of oil to remove acid pitting.
  4. Inability of oil remove friction and residue binding that causes valves to tap.

For the complete story of how each of the four negatives develop and their contribution to tapping: click here!

For the complete story on what a mechanic does to end tapping, Its cost : click here!

For the complete story of how to select additives to end each of the causes of your engine valve tap problem : click here!

To buy the best all around, easiest to install additive solution to end your tapping in one hour or less by driving  - Click the cart button  below.

Click each of the four negatives develop and their contribution to tapping: click here!

Engine valves, or their valve lifters tap when any or all of the four above negatives are present inside the engine. 

Motor oil, when it breaks-down, becomes gummy and sticks the pistons rings. The stickiness keeps the rings clamped closed and from flexing outward as they should. That condition permits combustion - which produces enormous temperatures and pressures to slip pass the faulty acting piston rings - and mix with you oil down below. This adds to oil breakdown. Circulation spreads the gooey condition to your engine valves, valve lifters, and piston rings. Engine noisy eventually develops - like the following. Ending motor piston blow-by is one of the fixes [two options] needed to end the [valve tap] problem.

  1. 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.

  2. 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.

  3. Carbon - residues from dirty combustion holds open your valve. Same problem as 3 occurs. And also rough idle, or stalling will occur.

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