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

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

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Automobile Engineering in ME
The function of a radiator fan in the cooling system is that

It is turned by wind force as the vehicle moves forward, and its rotation drives the water pump
It blows air through the radiator when necessary
It draws heat out of the engine compartment
It cools the engine by blowing air onto the cylinder block

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