Automobile Engineering in ME
The main purpose of an engine's air cleaner is that it

Prevents dust and other foreign matter from entering the engine
Reduces the engine's air intake noise
Controls the engine's air intake volume
Prevents rain water from entering the engine

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

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

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