Diesel generator maintenance training diesel article -p12-p15 diesel generator firewood ...

Diesel Engine Maintenance Training Diesel Engine Parts -p12-p15 Diesel Engine Diesel Engine Diesel Engine Parts

Diesel generator diesel engine to achieve the role of cooling cylinder bore and body: push rod hole is used to install the push rod; there is an oil hole between each two cylinders, the oil through the hole into the cylinder head oil hole and rocker oil Copper tube, then enter between rocker arm and shake g axis.

Figure 2-6 shows the cover of the transmission mechanism. The interior of the drive mechanism is equipped with an inert gear, a timing gear, a high-pressure oil pump transmission gear, and a driving gear.

The starter is assembled through the mounting holes shown in Figure 2-7.

3. The body is easy to produce faults and locations

Diesel engine diesel engine from the body prone to failure, there are two: First, there is a crack, and the second is the deformation. If the engine body cracks, it will cause the diesel engine to leak gas, the oil in the bottom of the mooring tank will enter the water or leak oil; if the machine body is deformed, the relative position of the surface of the machine parts will be damaged, and the concentricity of the main bearing hole will be destroyed and the main bearing hole The degree of parallelism to the centerline of the camshaft housing bore and the perpendicularity of the centerline of the cylinder to the centerline of the main housing bore. Cracks are likely to occur between the cylinder liner bores and the cylinder body wall, as shown in Figure 2-1 (a) and Figure 2.3.

4. The main reasons for damage to the body

The diesel generator diesel engine cracks from the main body of the main fierce as follows; First, in the casting thickness uneven phenomenon or casting residual stress is too large; Second, the operator use, improper maintenance. For example: In cold regions, the cooling water of the diesel engine is forgotten to let go; the excessive accumulation of scale causes local heat dissipation. The diesel engine runs for a long time under high load, resulting in excessive thermal stress inside the engine: the operator suddenly experiences high temperatures in the diesel engine. Add cold water to the tank: the impact of a large external force will also cause the body to crack and so on.

There are three main reasons for the deformation of the machine body: one is that there are defects in the casting; the other is that the body is deformed by high temperature during welding cracks; thirdly, the torque used by the maintenance personnel when tightening the nut of the cylinder head exceeds the torque specified in the technical specification, thereby causing Deformation around the borehole.

5. Inspection method of the body failure

(1) Inspection method of body crack

When the diesel engine of the diesel generating set emerges from the body, the observation method and the hydraulic pressure test method can be used for the inspection.

1 observation method. This method is suitable for checking initial cracks. Before the diesel engine is disassembled, fill the water radiator with water first, start the diesel engine, and observe whether there is water leakage outside the engine. If there is water leakage, it should be stopped and repaired. If it is found that the amount of oil in the bottom of the oil increases, the cover plate shall be quickly removed and the body wall of the machine shall be illuminated with a flashlight to observe whether the leakage phenomenon occurs in the inner wall of the machine or in the cylinder wall or wall, as shown in FIG. 24 .

2 hydrostatic test method. In the hydrostatic test, a certain pressure must be guaranteed and it should be carried out in the absence of scale. In the absence of a dedicated seal, it can also be blocked with a finger. Common tools include hydraulic presses, automotive air pumps, and high-pressure air simplifications.

(2) Inspection method of body deformation

When the body is deformed, the following methods can be used for inspection:

One is to use a vernier caliper or height gauge to check the height of both ends of the body. The purpose of this is to check the parallelism between the top plane and the bottom plane of the body. The inspection of the parallelism between the main bearing housing hole and the bottom plane of the machine must be carried out after turning the body.

The second is to use a ruler and a thick gauge to determine the degree of deformation of the top and bottom planes of the body.

The third is to check the concentricity of the inside hole of the body with a dry-diameter inner diameter.

Body failure repair method

The following repair methods can be used after the body has cracked:

1 bonding method. This method is the use of epoxy resin for adhesive repair, low cost, and easy to operate, the quality is also more ambiguous but not suitable for bonding at high temperatures, only suitable for repair around the water jacket.

2 welding method. This method is to use non-ferrous metal electrodes for welding at room temperature, in order to deal with cracks in the welding segment welding.

2 heating welding method.

Welding stress and deformation.

This method is to use a torch to heat the selected area during welding, and 4 plate bonding. This method is suitable for the site where the crack is concentrated.

(2) Repair method of local deformation of the body

When the diesel engine diesel engine is deformed locally from the body, the following methods can be used for repair: First, use a scraper to scrape;

Grinding with a grinding wheel or repairing with a thicker trowel can also be done with a milling machine for larger deformed bodies:

It is to bore and scratch the inner hole of the heart inside the body.

Internal Structure of 1.135 Series Diesel Engine Cylinder Head

Diesel engine diesel engine cylinder head is the main component of the diesel engine structure, used to close the upper part of the body, and the piston and cylinder liner constitute the combustion chamber and ensure the smooth progress of the diesel engine's intake and exhaust processes. The cylinder head belongs to the fixed parts of the diesel engine and it is the skeleton that installs the fixed parts and moving parts of the diesel engine. Cylinder heads have modular (or integral) and unibody divisions. A combined (or integral) cylinder head means that two or more cylinders share a cylinder head. The disadvantage is that the force is uneven and deformation is likely to occur. Therefore, the maintenance personnel must disassemble according to the order and torque specified in the instructions. And assembly. A single cylinder head means that each cylinder uses a single cylinder head. The cylinder head is generally cast in cast iron or aluminum alloy. In order to facilitate the cooling of the cylinder head, a water jacket is cast in the interior. The cooling water enters the water jacket of the body from the water tank (or radiator) and then passes through the cylinder pad water outlet hole to enter the inside of the cylinder head. The water jacket, with the pressure cycle of the water pump, the cooling water is discharged from the outlet hole on the end face of the cylinder head and enters the outlet pipe of the cylinder head. Diesel engine cylinder heads are generally made of cast iron. Gasoline cylinder heads are generally cast in aluminum alloy. The internal structure of the 135 series diesel engine cylinder head is shown in Figure 2-10.