Automobile Engineering in ME
The crankcase dilution means

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

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Automobile Engineering in ME
An imbalance wheel during vehicle operation

Bounces vertically or deflects from side to side (as seen from front or rear)
Creates a standing wave
Deflects in the vehicle's longitudinal direction
Makes large noise when its heavy point hits the road surface

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