Engine Valves and their Mechanisms

·         In a four stroke engine each cylinder has

Answer: A four stroke engine cylinder has one intake and one exhaust valve.

·         In a diesel engine the fuel injection pressure is in the range

Answer: The pressure of fuel injection is very high for a diesel engine.

·         The valve is opened as the cam lobe on the cam raises the

Answer: Valve opens when valve lifter is raised.

·         Exhaust valve temperature is about

Answer: The temperature of the exhaust valve is of the order of 500 degree celsius.

·         The size of the engine intake valve is

Answer: The exhaust valve is made bigger in size than the intake valve.

·         The device used to measure the clearance between the valve and tappet of an IC Engine is

Answer: A Feeler gauge is used to measure the clearance.

·         The purpose of valve clearance is to

Answer: Valve clearance ensures that valve closes completely.

·         The opening and closing of a valve is respectively done by

Answer: An engine valve is opened by a cam and closed by a spring.

·         On modern four stroke engines the exhaust valve opens just

Answer: Exhaust valve opens before the piston reaches Bottom Dead Centre.

·         On modern four stroke engines the inlet valve opens just

Answer: Inlet valve opens before the piston reaches Top Dead Centre.

·         A relief valve is fitted to the main oil gallery of an engine. The purpose of this valve is to

Answer: A relief valve limits the maximum oil pressure.