Automobile Engineering in ME
If the valve clearances are excessively large, the problem that can arise is

Fouling of spark plug by gasoline
Overheating of the engine
None of the listed here
Incomplete valve closure

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

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

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