Automobile Engineering in ME
In a four speed four stroke Diesel engine, the intake valve

opens at 20° before T.D.C. and closes at 35° after B.D.C.
opens at 10° after T.D.C. and closes at 20° before B.D.C.
not listed here
opens at T.D.C. and closes at B.D.C.

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

Make the crankshaft turn smoothly
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

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