It is necessary to maintain the valve clearances as they<...
It is necessary to maintain the valve clearances as they
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
increase the speed at which the valves move up and down
make the crankshaft turn smoothly
Correct answer is B
No explanation has been provided for this answer.
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