Automobile Engineering in ME
The crankcase dilution means

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

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Automobile Engineering in ME
The purpose of a balancer shaft is to

Increase inertia force of the rotating crankshaft
Reduce vibrations caused by the crankshaft rotation
Adjusts the timing of the intake and exhaust valve openings
Balance the timing in the movement of the two groups of pistons

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