Chỉnh khe hở nhiệt xú-páp động cơ 4 xylanh xài vít hiệu chỉnh

My video is not to teach anyone. I only post it for personal needs. If anyone finds it inappropriate, please ignore it. Thank you! Due to being busy with work, I don't have time to edit the video, I hope you understand. The internal combustion engine is a heat engine, so during the fuel combustion process, the combustion temperature is very high, about 1900-2500 degrees Celsius. Therefore, the OHV, OHC engine with a distribution mechanism when using a normal jack (not a hydraulic jack), the valve is in direct contact with the combustion gas, so according to physical properties, it will expand and lengthen. To avoid the phenomenon of the valve expanding and lifting, the valve opens by itself, causing compressed air leakage - that is, losing compression, which reduces engine power. Or if the gap is too large, it will cause noise during operation - called wild valve, and the valve opening is not large enough, causing less air to be sucked in, which also reduces power. It is necessary to check the gap and re-calibrate it to the manufacturer's specifications, so that the engine operates smoothly and achieves the desired capacity. Preparation. 1. Determine the rotation direction (learned) 2. Determine the firing order (learned) and the most common 4-cylinder engine is 1-3-4-2 3. Determine the parallel piston pair (learned) 1-3-4-2 means the 1-4; 2-3 pair are parallel to each other. 4. Prepare a suitable wrench or wrench, a suitable flat screwdriver. Measuring tape, rags... 5. Documents about the engine being repaired Steps to proceed. 1. Rotate the crankshaft so that the 2 valves of cylinder 1 overlap, meaning that cylinder 4 compresses the combustion head. Measure and calibrate the 2 valves of xl4. Measure and check the intake valve of cylinder 3; and the exhaust valve of cylinder 2. (If you don't remember, just shake the rocker arm or the push rod to see if there is any clearance, then check the gap and adjust). 2. Rotate the crankshaft 1 more turn - 360 degrees, then we can check and adjust the remaining valves (2 valves of cylinder 1; exhaust valve of XL3; intake valve of XL2). P/S, it is best to adjust according to the manufacturer's specifications. Some engines require the engine to warm up before adjusting, then check and adjust. In short, if you have the correct repair documents for the engine you are working on, just follow the instructions, it is absolutely correct and safe.