Automobile Engineering in ME
The sequence order of events in a four stroke engine is

Suction power compression exhaust
Suction exhaust power compression
Exhaust compression power suction
Suction compression power exhaust

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

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

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