In a car, when is the head gasket flushed?

Introduction In a car, under what circumstances is it called cylinder seal flushing? Because the high temperature and high pressure gas impacts the cylinder seal and burns the mouth, retainer and asbestos board, resulting in cylinder air leakage and lubricating and co

In a car, when is the head gasket flushed?

Since the high temperature and high pressure gases impact the cylinder seal and burn the packing port, retaining ring and asbestos board, resulting in air leakage from the cylinder and leakage of lubricating oil and cooling water, this phenomenon is called cylinder seal flushing. This is an impact break between the piston and the cylinder body of the internal combustion engine of a motor vehicle.

The main reasons for flushing cylinder seals are:

1. A significant lack of lubricating oil, which leads to an increase in the friction temperature between the cylinder body and the piston and between the connecting rods. strongly increase. At high temperatures, due to the drastic change in the thermal expansion coefficient of metal objects, the lubrication gap quickly becomes smaller, causing the piston, cylinder and connecting rod to jam. Due to the strongoperating inertia force, the cylinder block suffered serious impact damage and was scrapped.

2. If the mechanical lubrication gap between the piston and the inner wall of the cylinder is too large, it will also cause mechanical impact of the piston on the cylinder.

Detailed information:

< p>1. Flushing of the engine seal from the cylinder is a common fault. Abnormal noise from a flush head gasket can take many common forms. Since the cylinder seal is washed away to varying degrees, the resulting abnormal noises are different. Three different sets of Hong-120 based pulse dozer engine cylinder seal failures present troubleshooting methods.

2. Currently, the following types of cylinder seals are widely used:

1. Asbestos metal cylinder sealslique. This type of asbestos has metal wires or metal shavings sandwiched in the middle and is covered with copper or steel. This type of steel stamp is 1.2-2mm thick, has good elasticity and heat resistance, and can be used repeatedly, but its strength is poor and its thickness and quality are uneven.

2. Made from solid sheet metal. This type of gasket is mainly used to strengthen engines and is often used in cars and racing cars. This seal drills ridges of a certain height around the cylinder holes, water holes and oil holes that need to be sealed and uses the seal. elasticity of the ridges. Deform to achieve tightness.

Reference materials:

Baidu Encyclopedia_Chong Cylinder

< p>How to maintain diesel generator sets in winter? Diesel generator sets requireAlso ent some maintenance methods in winter, so that the diesel generator set can be used for a long time.

1. The low temperature of engine fuel in winter can easily increase the viscosity and poor fluidity of diesel, making it difficult to atomize diesel, leading to poor atomization and even worsening of combustion, reducing power. and the performance of the diesel engine decreases, so a light diesel with low freezing point and good ignition performance should be used in winter. It is generally required that the freezing point of the diesel engine be 7-10°C lower than the current local seasonal low temperature.

2. Use an open flame to make it easier to start the machine.

In places where the temperature is too low, you can use an open flame to make it easier to start the machine, but the air filter does notcannot be removed. Dip cotton thread in diesel fuel and light it to make a fire starter and place it in the intake pipe to start combustion. In this way, during the starting process, dusty air from outside will be directly inhaled into the cylinder without filtering, causing abnormal wear of the piston, cylinder and other parts. This will also cause the diesel engine to run rough and damage the machine.

3. Release the water too early or do not release the cooling water.

Run the generator at idle before shutting it down. Wait for the cooling water temperature to drop below 60°C and. the water is not hot, then turn off the motor and release the water. If the cooling water is released prematurely, the body will suddenly shrink and crack when suddenly attacked by cold air when the temperature is high. During the emptyingage of water, the remaining water in the body must be completely drained to prevent it from freezing and expanding, causing the body to burst. Shunjinxing recommends users to use antifreeze regardless of the season. The higher end the generators are, the more antifreeze they must use. Because antifreeze not only plays a cooling role, but also protects the diesel engine.

IV. Selection of lubricating oil

In winter, an engine oil with a low freezing point should be selected. When starting, an external water bath can be used to heat the engine oil. increase the oil temperature. It is not recommended to use an open flame to avoid deteriorating or even burning the oil in the oil pan, reducing or completely losing lubrication performance, thereby exacerbating machine wear.

5. Starting method

In winter, if possible, it is preFeasible to assemble a water heater for the generator. This can keep the machine at a certain “body temperature”. " and can be used easily at any time. operation. In order to quickly start the diesel generator set, some operators often use the abnormal start method of waterless start (start first, then add cooling water). This practice may cause serious damage to the machine and should be prohibited. The correct preheating method is: first cover the water tank with an insulating quilt, open the drain valve and continuously inject water. fresh, clean water at 60-70°C in the water tank when the water flowing out of the drain tap is hot when you touch it with your hand, close the drain tap and then start again. p>

6. Precautions for low temperatures and load conditions

After the generator set starts and firesiesel, some operators can't wait to start the charging operation immediately. In a diesel engine that has recently caught fire, due to the low body temperature and high oil viscosity, the oil is not easily penetrated into the moving friction surfaces, which will cause significant wear of the machine. Also, piston springs, valve springs and injectors.

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