Automobile Engineering in ME
It is necessary to maintain the valve clearances as they

Allow for lengthening of the valves owing to the heat of combustion
Make the crankshaft turn smoothly
Reduce the resistance to sliding that occurs between the cam and the tappet
Increase the speed at which the valves move up and down

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Automobile Engineering in ME
The function of positive crankcase ventilation (PCV) system is that it

Returns blow by gases from the crankcase to the intake system
Mixes fuel with air
Feeds blow by gases to the exhaust manifold
Promotes combustion by creating a swirling movement in the air-fuel mixture

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Automobile Engineering in ME
The fuel pump of a programmed fuel injection (PFI) system operate for two seconds when the ignition is turned to the start position to

Pressurise the fuel system before the engine is started
Supplies a large amount of fuel and thereby creates a choke effect
Enable the pump's fault diagnosis function to operate
Warm up and lubricate the pump

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