What is metal in a car cylinder bed
Youdaoplaceholder0 Automobile cylinder bed - metal refers to the sealing element installed between the cylinder block and the cylinder head, also known as cylinder gasket . Its main function is to fill the micro pores between the cylinder block and the cylinder head, ensure good sealing at the joint surface, thereby ensure the sealing of the combustion chamber, prevent cylinder leakage and water jacket leakage .
Types and characteristics
There are various types of automotive cylinder gaskets, each with its specific characteristics and applicable scenarios:
Youdaoplaceholder0 Metal asbestos cylinder gasket : Made of asbestos with wire or metal shavings in between and covered with copper or steel sheet. This gasket has good elasticity and heat resistance, can be reused, but has poor strength, uneven thickness and quality .
Youdaoplaceholder0 Solid metal sheet cylinder gasket : A certain height of protrusions are punched around the sealed cylinder holes, water holes and oil holes, and the sealing is achieved by the elastic deformation of the protrusions. Mostly used to strengthen engines, suitable for cars and racing .
Youdaoplaceholder0 Cylinder head liner made by stamping asbestos and rubber adhesive : With braided steel wire mesh and perforated steel plate as the skeleton, the two sides are stamped with asbestos and rubber adhesive. This gasket has good sealing and durability .
Symptoms of malfunction after damage
The following fault symptoms will occur after the cylinder gasket is damaged:
Youdaoplaceholder0 Air leakage between two adjacent cylinders : Insufficient power after starting the engine, black smoke comes out, engine speed drops significantly .
Youdaoplaceholder0 Cylinder head leakage : Pale yellow foam appears at the leakage point, there is a leaking sound, accompanied by water and oil leakage, and obvious carbon deposits can be seen on the corresponding cylinder head plane and nearby cylinder head bolt holes .
Youdaoplaceholder0 Gas oil channel : The engine oil has obvious bubbles .
Youdaoplaceholder0 High-pressure gas enters the cooling water jacket : Obvious bubbles rise in the radiator, accompanied by a large amount of hot air being released from the radiator opening. As the engine temperature rises, the amount of hot air released from the radiator opening gradually increases .
Youdaoplaceholder0 Leakage of engine cylinders from the cooling water jacket or lubricating oil passage yellowish-black oil bubbles floating on the surface of the cooling water, or obvious water in the oil pan .
Automobile cylinder bed METAL Functions mainly include the following aspects :
Youdaoplaceholder0 Sealing function : The cylinder bed metal is located between the cylinder head and the cylinder block. Its main function is to fill the microscopic gap between them to ensure good sealing and prevent cylinder leakage and water jacket leakage .
Youdaoplaceholder0 Compensation for unevenness : The metal in the cylinder bed needs to have a certain degree of elasticity to compensate for the possible roughness and unevenness on the surfaces of the cylinder block and cylinder head, and at the same time resist the deformation caused by pneumatic force during engine operation .
Youdaoplaceholder0 Pressure resistance, heat resistance and corrosion resistance : The metal of the cylinder bed needs to withstand the pressure caused by tightening the cylinder head bolts, as well as the high temperature and high pressure of the combustion gas in the cylinder, and the corrosion of the engine oil and coolant .
Youdaoplaceholder0 Material type : Cylinder bed metals can be classified into asbestos metal gaskets, composite metal gaskets and all-metal gaskets, etc., according to different materials. Metal composite gaskets and all-metal gaskets, which have no asbestos interlayer and reduce industrial pollution, are the current development direction .
Youdaoplaceholder0 Specific models : Common cylinder bed metal models include metal asbestos gasket and metal gasket. Metal asbestos pads are made with asbestos as the base material and covered with copper or steel sheets. Although they are relatively inexpensive, they have poor strength and contain asbestos components that are harmful to human health. Therefore, they have been discontinued in developed countries. Metal gasket is made from a single piece of smooth steel plate, has high strength and good sealing effect, but costs more .
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