Question

3. Adjusting valve tappet clearance of four cylinder engine​

Answer 1

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Adjusting valve tappet clearance of four cylinder engine

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➪ So tappet clearance is regularly measured and adjusted based on manufacturer data to ensure the positive operation of inlet and exhaust valves. In general, the clearance taken is between 0.2mm to 0.6mm depending upon inlet and exhaust valves and engine manufacturers

More about to know ⬇️

Why are we require to measure tappet clearance?

There is no real mechanical linkage between the valves and the rocker arm in four-stroke engines. When you open the cover of the cylinder head for inspection, you will find a gap/clearance in between.

There is no physical connection; valves are operated by the movement of push rod operating ( pushing ) rocker arm in one or another direction.

When there is a change i.e “increase or decrease” in this clearance due to thermal or mechanical expansion; valve timing is adversely affected so are the power cycle.