Diesel generator maintenance training of the diesel engine -p96-p100 diesel engine disassembly...

Diesel engine maintenance training of the diesel engine -p96-p100 diesel engine disassembly the first section of the diesel engine disassembly

The correct disassembly and assembly of diesel generators is a prerequisite for diesel engine repair. Without the technical requirements for disassembly and assembly, blindly disassembling and assembling may damage the diesel engine parts and even cause damage to the whole machine. Therefore, before the dismantling and assembling of the diesel engine, the maintenance personnel must be skilled in mastering various technical requirements, so that they can be disassembled and assembled in a planned and organized manner. They must not be disassembled and should not be disassembled, and the disassembled parts should be reduced as much as possible. Dismantling range.

First, the preparation of the diesel engine before demolition

The dismantling of a diesel engine is a tedious and important task, and there must be a plan regardless of the type of repair and maintenance. The preparation of the diesel engine before its demolition is detailed below.

1. Comprehensive understanding of the technical status of the diesel engine to be repaired

Carry out a thorough understanding of the diesel engine's failure phenomena, technical conditions, and operating conditions before proceeding with repairs and maintenance. For example, the diesel engine oil corresponds to four cylinders, all of which determine the exact location of the fault and then repair and dismantle it.

2. Preparation of technical data and maintenance grounds

Prior to the maintenance of the diesel engine, it is necessary to understand the operating instructions, various technical data and requirements of the diesel engine.

Different types of diesel engine repair technology standards are not the same. For example, the cold clearance of the inlet and exhaust valves of the 4120 diesel engine is 0.2M or 0.25M, while the cold clearance of the inlet and outlet valves of the 4135 diesel engine is 0.25-0.30mm or 0.30-0.35mm. The oil advance angle is also different. Before the demolition, a certain amount of maintenance space should be prepared. In the case of strong wind or rain, it cannot be dismantled outdoors.

3. Preparation of tools and equipment.

Diesel generators Different diesel engines may use different special tools, but common tools are generally the same, including open-end wrenches, box wrenches, pliers, socket wrenches, adjustable wrenches, button wrenches, hammers, wooden hammers, and hacksaw blades Wait. Figure 3-1 shows some common tools.

Special tools include sleeves for disassembling the connecting rod screws, tapered guides for assembling the piston connecting rod assembly, pullers for disassembling the cylinder sleeve, and valve seat dumplings for reaming the valve seat. Measuring tools include feeler gauges, cylinder pressure gauges and micrometers. Lifting tools include jacks and sleds.

The socket wrench is a combination tool, which is suitable for the installation of a narrow and more concealed bolt or nut, as shown in Figure 3-2. The combination tool is equipped with quick handles for quick-release bolts and nuts, adjustable wrenches, extension rods, directional joints, screwdriver sleeves and extension sleeves.

The simple cylinder sleeve puller is used to remove the cylinder sleeve. The chassis can be made into different specifications according to the inner diameter of the cylinder sleeve, as shown in Figure 3-3. The characteristics of the Rally is simple workmanship, easy to use.

The tapered guide tube is a special tool designed for mounting the piston rod assembly, as shown in Figure 3-4. When in use, first place the tapered guide on the upper end face of the cylinder liner and then install the piston rod assembly.

The cylinder pressure gauge is designed to measure the cylinder pressure, as shown in Figure 3-5.

Cylinder pressure gauge can be divided into 0-980Da and according to different measuring range. A 19MDa two; according to the different ways of connection, it is divided into push-type and threaded interface type two. At present, diesel engines use mostly threaded cylinder pressure gauges. The method of use is to screw the threaded interface of the cylinder pressure gauge into the nozzle hole of the injector, and then use the starter to drive the crankshaft to rotate for 4-5 seconds to keep the diesel engine speed at 350r. At around /min, the value indicated by the pressure gauge is the compressive force of the cylinder under test.

The diesel generator valve seat reamer is a special tool designed for reaming the valve seat, as shown in Figure 3-6. A valve seat reamer is composed of a guide rod and a plurality of reamers of different diameters and different angles. The angle of the reamer is 15 degrees, 30 degrees, 45 degrees and 75 degrees. 30-degree and 45-degree dumplings knife is divided into two kinds of rough-edged reamer and small-edged knife.

The feeler gauge is mainly used to measure the valve clearance of diesel engines. It can also be used to measure the backlash between gears and the deformation of the bottom plane of the cylinder head, as shown in Figure 3-7.

Dry points are only used to measure the internal diameter and outer diameter of diesel engine parts measurement tools, deep dry feet can also be used to measure the depth of individual parts, etc., as shown in Figure 3-8.

The jack can be used to replace the tires of a diesel engine and the oil pan of a stationary diesel engine, as shown in Figure 3-9.

The multimeter can be used to measure whether the starting control circuit has a short-circuit or disconnection phenomenon. It can also be used to measure whether there is a short-circuit or open-circuit fault inside the silicon rectifier alternator. It can also be used to detect diodes.

Figure 3-10 and the injector calibration table are mainly used to test the quality of the fuel injector atomization and the injection pressure.

The diesel generator fuel injection pump calibration table can be used to check and adjust the fuel supply of the injection pump's sub-pump, seal, oil supply time, and the governor's speed control performance, as shown in Figure 3-13.