Automobile Engineering in ME
The crankcase dilution means

Dilution of oil by water in the crankcase
Dilution of mixture passing through crankcase in two stroke engines
Dilution of lubrication oil by fuel in the crankcase D. Dilution
Dilution of fuel in the crankcase

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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
Reduce the resistance to sliding that occurs between the cam and the tappet
Increase the speed at which the valves move up and down

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