QSB6.7 Cummings 6 Cylinder Diesel Engine For Excavator PC200-8 Water Cooling

QSB6.7 Diesel Engine Assembly For Excavator PC200 - 8 Water Cooling

Specification

Description

A machine for converting thermal energy into mechanical energy or power to produce force and motion. 2. a railroad locomotive. 3. fire engine. 4. any mechanical contrivance. 5. a machine or instrument used in warfare, as a battering ram, catapult, or piece of artillery.

Main Parts of an Internal Combustion Engine:

Cylinder head

The top end of the engine cylinder is closed by means of removable cylinder head. There are two holes or ports at the cylinder head, one for intake of fuel and other for exhaust. Both the intake and exhaust ports are closed by the two valves known as inlet and exhaust valve. The inlet valve, exhaust valve, spark plug, injector etc. are bolted on the cylinder head.

The main function of cylinder head is to seal the cylinder block and not to permit entry and exit of gases on cover head valve engine. Cylinder head is usually made by cast iron or aluminum. It is made by casting or forging and usually in one piece.
Main Parts of an Internal Combustion Engine (cylinder head)

Piston rings

A piston must be a fairly loose fit in the cylinder so it can move freely inside the cylinder. If the piston is too tight fit, it would expand as it got hot and might stick tight in the cylinder and if it is too loose it would leaks the vapor pressure. To provide a good sealing fit and less friction resistance between the piston and cylinder, pistons are equipped with piston rings.

These rings are fitted in grooves which have been cut in the piston. They are split at one end so they can expand or slipped over the end of piston. A small two stroke engine has two piston rings to provide good sealing but a four stroke engine has an extra ring which is known as oil ring. Piston rings are made of cast iron of fine grain and high elastic material which is not affected by the working heat. Sometimes it is made by alloy spring steel.

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