Diesel generator set maintenance training diesel engine -p101-p106 diesel engine...

Diesel generator repair training diesel article-p101-p106 diesel engine disassembly principle

Second, the demolition principle of diesel generator diesel engine

In order to prevent the damage of the diesel engine components or the change of the fitting clearance of the bit components during disassembly, certain principles must be followed when disassembling.

1 It is necessary to grasp and understand the structure and working principle of each part of the diesel engine. The working principle of the diesel engine is basically the same, but the model and structure are various. In order to prevent damage to the diesel engine parts or change the normal fit clearance of parts and components during disassembly, be sure to understand the structural relationship of various parts before disassembling, and to view the manual and other technical data concerning repairs that are carried randomly by the diesel engine.

2 When disassembling, consider repair and assembly. When the diesel engine is disassembled, if there is no technical data and instructions, and there is no maintenance information of the same series, various data and various torques in the disassembly process should be recorded before disassembly. For example, detailed records are made for injection advance angle, valve clearance, torque for unscrewing the connecting rod screws, torque for disassembling the cylinder head screws, and relative position of each component before disassembly, to prepare for assembly and troubleshooting. At the same time can also accumulate experience for future maintenance.

2 Do not arbitrarily expand the scope of repair. When dismantling a diesel engine, try to reduce the scope. As long as the diesel engine is not overhauled or damaged, the dismantling of the parts should be reduced as much as possible. Otherwise, the workload will be increased, and the coordination between other parts will also change.

4 The disassembly method must meet the technical requirements. The disassembly of various diesel engine parts has certain technical requirements. Generally, the external parts are disassembled first, and then the internal parts are dismantled: first the disassembled parts are disassembled, then the main parts are disassembled; first, the whole parts are disassembled, and then the integral parts are disassembled. The dismantling of individual parts must be carried out according to certain technical requirements. For example, the nuts of the cylinder head cannot be disassembled easily. One strand should be removed diagonally from the outside to the outside, and the assembly must be carried out from the inside to the outside. Otherwise, the cylinder will benefit. Deformation occurs, especially for modular cylinder heads. For cylinder head nuts with disassembly instructions, they must be removed as required. When disassembling, nuts, bolts, gaskets, and special parts should also be classified and placed.

Third, the diesel generator diesel engine disassembly in the safety of technical rules

In order to prevent casualties, damage to tools and equipment, and deformation and unloading of mechanical parts, the following rules must be followed:

1 Use tools properly. When disassembling, try to use special tools for diesel engines. Do not use adjustable wrenches. When tightening and disassembling the screw or nut, the torque should be appropriate, and generally do not use longer enthalpy. Use even force when disassembling parts to prevent excessive force and damage to components. The nut should be disassembled with a sleeve or box wrench to prevent the nut angle from being pulled back when using other tools.

2 to prevent accidents and injuries. Do not remove hard-to-remove parts. Please understand the specific structure of the parts.

The scope of dismantling shall not be arbitrarily expanded. The scope of dismantling shall be determined in accordance with the contents and items of repairs. The removed parts should be placed in an orderly manner and cannot be put together. Parts that cannot be repaired for a long time must be rust-proofed and the precision mating parts removed must be placed in pairs. During the entire disassembly process, it is necessary to prevent the parts from being deformed, and at the same time pay attention to personal safety.

Fourth, the general technology of diesel engine disassembly

The dismantling of diesel engines is mainly the disassembly of nuts and bolts. In order to prevent the deformation of the machine parts, the disassembly of nuts and bolts of important parts is gradually released from the outside to the inside of the school and divided into two or three times.

1 Demolition of studs. Generally can be disassembled using the double nut method.

2 rust nut removal. Diesel engine often encounters rusted nuts during disassembly. For this kind of nut, it can be disassembled by tightening and loosening. The torch can also be used to evenly heat the nut or drip in between the nut and the bolt, and then disassemble it.

3 interference fitting disassembly. General use of special tools for dismantling, such as disassembly of the piston pin by heating method, dismantling the connecting rod copper sleeve with a press bed, disassembling the valve guide tube with a mirror, and removing the cylinder sleeve with a special puller.

4 marks, labels. This is a very important task. The dismantled components (such as spurs, connecting rods, push rods, tappets, cylinders, intake valves, exhaust valves, valve springs, valve locks, valve cards, Connecting rod screws, high-pressure tubing, and various gaskets, etc.) must be described on the label is the number of cylinders, the relative position of the various parts of the density of the West 4iBg Tian 11 Friends of some 拙 拙 柱 韶 column to pay in the short oil sea damage There is a certain difference in fullness. For disassembled nuts, washers, and bolts, wells must be placed in pairs.

V. Disassembly of major diesel engine components

The disassembly steps and methods for different types of diesel engines are not necessarily the same, but the basic requirement is the 6135 diesel engine as an example to illustrate the steps and methods for disassembling the vulnerable parts.

When you remove other parts of the body, you can follow the following steps:

After the diesel engine is completely cooled, all cooling water and engine oil are drained, while the maintenance site is kept clean.

2 Remove the high pressure oil pump, fuel injector, diesel filter and high pressure oil pipe and remove all indicator instruments. 2 Remove the air filter, muffler, intake pipe and exhaust pipe.

4 Remove the water pump assembly, cylinder head outlet pipe, thermostat, water temperature sensor plug and all kinds of water pipes 5 remove F oil filter assembly, oil radiator and oil pipe, etc. '6 Remove starter system and charge from diesel engine System purchases all parts.

2. Cylinder head removal

The cylinder head removal method is as follows:

1 Before removing the cylinder head, first remove the cylinder head cover, and then remove the rocker arm assembly, as shown in Figure 3-16.

Remove the pusher after removing the 2 slots, as shown in Figure 3-17

4 When removing the cylinder head screw, first press outside and inside

Diagonally, other parts are removed in order.

3. Disassembly of the piston rod assembly of a diesel generator set

When removing the piston rod assembly, first remove the steam

Cylinder upper carbon deposition and oil pollution. If the liner wears

The damage is serious, you can use a triangular knife to scrape it. Its disassembly

Proceed as follows:

1 Remove the lower cover of the body and turn the turpentine.

The piston to be dismantled is located at a position slightly after top dead center, as shown in Figure 3-18. 2 Use a torque wrench to disassemble the connecting rod screws 2-3 times, as shown in Figure 3-19. When the two connecting rod screws are removed and the connecting rod head cover is not easy to remove, insert the long post of the short wrench into the big head screw hole of the connecting rod and swing the post on the factory. If you can't remove it yet, pJ taps the post with a small hammer and you can remove it.

7 During removal of the connecting rod head cover, the large head cover (see Figure 3-20) should be supported by hand to avoid falling into the oil casing and damaging the bearing bush.

4 After removing the big cap, slowly turn the vaginal ball so that the piston is at the upper 6L point. At this point, push the big end of the connecting rod with your hand to disengage it from the journal of the crankshaft, and slowly turn the crankshaft. When the crankshaft is separated from the large end of the connecting rod by about 10 cm, the wooden rod is inserted, the journal is used as the fulcrum, and the skid is lifted to lift the piston rod assembly out of the cylinder sleeve, as shown in Fig. 3-21. During the removal process, it is necessary to prevent the connecting rods from damaging the inner wall of the cylinder liner.

4. Disassembly of cylinder liner

According to the method shown in Figure 2-20, a simple cylinder sleeve puller can be used to remove the cylinder sleeve and then push the cylinder sleeve out from below with a wooden rod.

5. Disassembly of the transmission gear of the diesel generator set

The disassembly method of the transmission gear is as follows:

1 Remove the front differential board, as shown in Figure 3-22.

2 Turn the diesel flywheel to make the driving gear and timing gear.