Automobile Engineering in ME
It is necessary to maintain the valve clearances as they

Increase the speed at which the valves move up and down
Reduce the resistance to sliding that occurs between the cam and the tappet
Allow for lengthening of the valves owing to the heat of combustion
Make the crankshaft turn smoothly

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Automobile Engineering in ME
The purpose of a cylinder head gasket is to

Removes impurities from cylinder head lubricating oil
None of these
Prevent the combustion gases from leaking from the joint between the cylinder block and the cylinder head
Prevent engine oil from going into combustion chamber

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