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The engine is equivalent to the heart of the car, so the maintenance and maintenance of the engine is a hard work that needs technical skills. In the near period, many novice start questions on the Internet, hoping to have a further understanding of the maintenance and maintenance of the engine. We have a comprehensive understanding of the engine, then learn how to maintain, it will be much easier. The basic structure and principle of the engine, the automobile engine, also known as the engine, mainly use the gasoline engine and the diesel engine, divided into four stroke engines and two stroke engines, which can be divided into four stroke internal combustion engines and two stroke internal combustion engines according to the number of stroke required to complete a working cycle. The crankshaft is turned two cycles (720 degrees), and the piston moves four strokes up and down in the cylinder. The internal combustion engine of a working cycle is called the four stroke internal combustion engine, and the crankshaft is turned round (360 degrees), and the piston moves up and down in the cylinder two trips, and the internal combustion engine of a working cycle is called the two stroke internal combustion engine. The four - stroke internal combustion engine is widely used in automotive engines. The number of cylinders in the engine is a single cylinder and a multi cylinder engine. The most commonly used car for household cars is gasoline engine. The gasoline engine is composed of two main bodies and five systems, which are composed of crank and connecting rod, fuel supply system, lubricating system, cooling system, ignition system and starting system; diesel engine is similar, different from diesel engine, and does not need ignition system. Crank and connecting rod mechanism is the main moving part for the engine to realize the working cycle and complete the energy conversion. It consists of body block, piston connecting rod group and crankshaft flywheel group. In the work stroke, the piston takes the gas pressure in a straight line in the cylinder, converts the connecting rod into the rotating motion of the crankshaft and outputs the power from the crankshaft. In the intake, compression and exhaust stroke, the flywheel releases energy and transforms the rotational motion of the crankshaft into the straight motion of the piston. The function of the gas distribution mechanism is to open and close the intake and exhaust doors according to the working order and working process of the engine, and make the combustible mixture or air enter the cylinder, and discharge the exhaust gas from the cylinder to achieve the gas exchange process. The valve train mostly adopts top valve type valve train, which is composed of valve group, valve drive group and valve actuating group.