Analysis of 22 Technical Misconceptions in Internal Combustion Engine Repair
The internal combustion engine plays an important role in our daily production, and its maintenance and repair technology is of great significance. In practical work, due to the low professional level of some maintenance personnel, many technical misconceptions occur, resulting in a strong interference of normal repair work.
1. The old engine will run better. In fact, if the internal combustion engine is used for too long, it will affect the performance. For example, the injection pressure or the spark voltage generated by the spark plug will be reduced, and the amount of oil used will increase, which will cause the spark plug or the fuel injection nozzle to appear running failure.
2. The old engine needs minor repair. In fact, it is necessary to check the state of the engine by measuring the internal pressure, temperature, and rotation speed before repair, and to conduct a comprehensive maintenance and repair work. Otherwise, the old engine will not be repaired to the original factory performance level.
3. During cleaning, it is suitable to use corrosive cleaners to corrosively remove sticky substances on the surface of the engine. In fact, the corrosive cleaner will corrode the delicate parts of the engine and cause irreparable damage.
4. The oil change interval can be extended. In fact, the lubricating oil of the internal combustion engine is not only used to ensure the airtightness of the engine but also to reduce the wear and tear of the parts, so the oil change interval cannot be extended too much, otherwise, the engine will be severely worn.
5. When disassembling the engine, the crankcase is best opened first. In fact, the crankcase can be opened, but the repair personnel should operate in strict accordance with the procedural requirements and carry out the entire dismantling process step by step, so that all dismantled parts can be checked and repaired in a timely manner.
6. All defects in the engine can be found and eliminated through disassembly inspection. In fact, not all engine problems can be eliminated by disassembling and inspecting the engine. Some problems can only be identified in the process of trial operation, such as the problems caused by air leakage.
7. The cylinder head gasket should be replaced when installing the cylinder head. In fact, even if there is no major problem with the cylinder head gasket, it should be replaced when installing the cylinder head to ensure the performance of the cylinder head in the course of running.
8. When replacing the cylinder head, all gaskets must be replaced. In fact, it is not necessary to replace all gaskets when replacing the cylinder head. Only when the gaskets are worn out due to aging or corrosion, they should be replaced.
9. During engine installation, it is necessary to replace all parts. In fact, some parts of the engine, such as bolts and nuts, can be reused if they are in good condition.
10. Of course, the engine repair only needs to replace parts. In fact, when repairing an engine, not only parts need to be replaced, but also electrical or instrument repair and adjustment need to be performed.
11. The fuel hose has a flexible texture and does not need to be replaced. In fact, the fuel hoses are not too soft, but are very hard and brittle, so they should be replaced in case of damaged or aging.
12. The new engine does not need to be adjusted. In fact, the new engine needs to be adjusted, according to its performance standard.
13. All engine faults can be diagnosed with a computer. In fact, not all engine defects can be detected by computer, and some problems must be identified through physical inspection.
14. You can start the engine as soon as you finish the installation. In fact, it is not advisable to start the engine immediately after installation, but to adjust its parameters in accordance with its technology requirements.
15. Ignoring the timing between the rising seat of the rocker arm and the corresponding piston. In fact, the most basic requirement for engine timing is that the high gate of the rocker arm should rise when the corresponding piston is at the top dead center of the cylinder, and this must be adjusted precisely.
16. Drilling directly with petroleum drills can solve the problem of air leakage in the engine. In fact, such a procedure is not correct and is likely to cause an accident. Instead, a horizontal boring machine should be used to repair the air leakage problem.
17. There is no need to pay attention to the gap between the valve stem and the valve guide. In fact, the gap between the valve stem and the valve guide should be adjusted in strict accordance with the requirements, otherwise the valve stem may be abraded.
18. The piston should always be moved up and down while disassembling and assembling the piston. In fact, the piston should not move up and down or rotate freely while disassembling and assembling the piston, but it should move horizontally at a certain speed to prevent overheating and scalding of the piston of the block.
19. There is no need to pay special attention to the crankshaft when rotating the engine. In fact, special attention should be paid to the crankshaft when rotating the engine, because if the crankshaft hits and collides, it will cause serious internal damage to the engine.
20. The spark plugs of an engine can be replaced with spark plugs of different brands. In fact, the spark plug should be replaced with the same brand as the original one, and the spark plug number should be exactly the same as the original one, and the gap between the electrodes should also be adjusted precisely.
21. The engine needs to be cleaned while repairing. In fact, it is not necessary to clean the engine while repairing it, because most of the time it will bring more trouble to the repair.
22. The air filter can be removed and cleaned directly. In fact, the air filter should not be removed directly, but should be cleaned in place with warm water and soap to ensure that the filter media are not damaged.
