The cylinder head of the diesel engine is a two-cylinder structure. Each cylinder has a cylinder head and adopts a two-valve structure. The intake and exhaust passages are respectively arranged on both sides of the cylinder head, and the water channel and the oil passage are cast inside. Auto Lock Steel Measuring Tape
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Structural features of diesel engine cylinder head
The cylinder head of the diesel engine is a two-cylinder structure. Each cylinder has a cylinder head and adopts a two-valve structure. The intake and exhaust passages are respectively arranged on both sides of the cylinder head, and the water channel and the oil passage are cast inside.
Cylinder head easy to generate faults and position
The failure of the cylinder head to be easy to use during use is the occurrence of cracks, increased cylinder carbon deposits and deformation. Cracks in the cylinder head may cause leakage of the diesel engine, oil in the oil pan or oil leakage; if the carbon deposit is too much at the bottom of the cylinder head, the diesel engine will overheat, the power will drop and the fuel consumption will rise; after the cylinder head is deformed, it is easy. A malfunction such as damage to the cylinder head gasket occurs.
The parts of the cylinder head that are prone to failure are:
1 around the valve guide.
2 spray oil cries around the water blockage damage.
3 Cracks and carbon deposits are likely to occur around the combustion chamber, and the bottom of the cylinder head is prone to deformation due to improper manufacturing and disassembly. The physical shape of the bottom of the cylinder head is shown in Figure 3-7.
Cause of cylinder head damage
1. The cause of the crack in the cylinder head
It is the same as the cause of the crack in the body.
2. The cause of the carbon deposit in the cylinder head
First, the diesel engine idling for a long time.
Second, the fuel supply advance angle is not adjusted according to the data specified in the technical specification.
Third, the pressure inside the cylinder is low.
Fourth, the fuel injected from the injector is poorly atomized, the injection pressure is low, and the oil-injection is not sprayed.
Fifth, the diesel engine is overloaded for a long time.
Sixth, the quality of diesel is poor.
1. The cylinder head is deformed and has a fault.
First, there are defects in casting.
The second is deformation due to high temperature during welding cracks.
Third, the torque used by the maintenance personnel when tightening the cylinder head exceeds the specified value in the technical specification, causing deformation around the screw hole.
Fourth, when the maintenance personnel assemble the cylinder head, each nut is unevenly stressed or not fastened in the specified order.
Fifth, the maintenance personnel did not disassemble the cylinder head fixing nut in the prescribed order.
Inspection method for cylinder head failure:
1, crack inspection method
The first is the observation method. This method is suitable for inspecting initial cracks.
The second is the hydrostatic test method. When the cylinder head is removed from the body for hydraulic pressure test, a certain pressure is required and the scale is removed. When there is no special sealing cover, you can also block the water outlet with your fingers. Commonly used hydraulic test tools include hydraulic presses and high pressure gas cylinders. The test method is shown in Figure 3-8.
2. Inspection method for deformation of the cylinder head and increase of carbon deposit at the bottom
Place the bottom of the cylinder head up in a horizontal position, then measure the unevenness with a ruler and feeler gauge, as shown in Figure 3-9. The increase in carbon deposits at the bottom of the cylinder head is generally checked by observation.
Repair method after cylinder head damage:
1. Repair method for cracks in the cylinder head
The specific repair method is the same as the repair method for cracks in the body.
2. Method for removing carbon deposits at the bottom of the cylinder head
1 Use a wooden scraper to remove. After disassembling the cylinder head, put it in kerosene for cleaning. After the carbon is softened, remove it with a wooden scraper.
2 Use an organic solvent to soften and then remove.
3. Repair method after deformation of the cylinder head
1 Repaired by scraping.
2 Flatten by grinding or milling.
Cylinder head removal and assembly skills:
The maintenance personnel are disassembling and assembling the cylinder head, especially when disassembling and assembling the combined cylinder head, and disassembling it in a certain order, otherwise the cylinder head will be deformed and cause undue loss.
When removing the cylinder head, it should be divided into three times from the outside to the inside. The disassembly sequence is shown in Figure 3-10. When assembling the cylinder head, it should be divided into three times from the inside to the outside, and the assembly sequence should be carried out in the reverse order of disassembly, ie 13-14-9-10-11-12-7-8-5-6-1 -2-3-4.
Structure and repair of cylinder head gasket:
In the assembly of the diesel engine, in order to ensure the tightness of the combustion chamber, a layer of high temperature resistant soft gasket - copper asbestos gasket or iron asbestos gasket is added between the cylinder head and the upper part of the body. For the cylinder head gasket.
The role of the cylinder head pad is to ensure a good seal between the upper part of the cylinder figure, the size of which is equivalent to the bottom plane of the cylinder head and the plane of the top of the body. The internal water channel and oil passage hole are equivalent to the cylinder head and the upper part of the body. . The physical shape of the cylinder head gasket is shown in Figure 3-11.
The cylinder head gasket is a wearing part and the cost is also low. When the cylinder gasket is damaged and the diesel engine leaks or leaks, the new parts are generally replaced without repair.
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Editor: (Hardware Business Network Information Center) http://news.chinawj.com.cn
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