In the diesel engine this “power fortress”, although the valve assembly is small in size, but bears a pivotal mission, like a precise “guardian”, control the key aspects of the engine operation, power output, fuel economy and emission performance has a far-reaching impact. It has a profound impact on power output, fuel economy and emission performance.

The valve assembly of a diesel engine mainly covers intake and exhaust valves, which are like the “gates” of the respiratory system, dominating the rhythm of gas in and out of the cylinder. The intake valve opens at the beginning of the engine's operating cycle, as if it were a precise “guide” to smoothly introduce oxygen-rich air from outside into the cylinder. At this time, the valve seat and valve core need to work seamlessly with each other, a very small gap leakage may lead to insufficient air intake, so that the fuel can not be fully combusted, and thus weaken the power. Under the advanced manufacturing process, the intake valve is made of high-strength heat-resistant alloy, and the surface has been finely ground to ensure that every time it opens and closes, it is tightly closed, so that a sufficient amount of fresh air comes in and builds a solid foundation for the efficient combustion of fuel to ensure that the engine can be “full of gas” in starting, accelerating and other working conditions.

For complex hydraulic tappet valve assemblies, if there is an unusual noise and the oil pressure is normal, it may be an internal tappet failure. The hydraulic tappet relies on oil pressure to maintain normal operating clearance, and internal plunger wear and check valve sticking can cause it to fail. Dismantle the tappet, clean the internal parts, check the wear condition, replace the damaged parts, reassemble and refill the oil according to the regulations, evacuate the air bubbles, and re-tune the valve lash, so that the hydraulic tappet restores the “spirit of movement”, accurately transmits the cam movement, and safeguards the valve opening and closing in an orderly manner.

Modern diesel engines are getting smarter and smarter, and the fault diagnostic instrument has become a sharp tool. Connect the OBD interface, read the valve assembly related sensor data, such as valve position sensor, camshaft sensor signals, abnormal data pointing to the corresponding fault parts, to assist in accurately locating the electrical line short-circuit, disconnection, or sensor malfunction, repair or replacement of faulty components, so that the electronic control system on the valve assembly “command” without error.

In the whole process of troubleshooting valve components, standardized operation and detailed records are indispensable. From the order of parts disassembly, wear and tear condition to maintenance and adjustment data, all detailed records, not only to help the maintenance of accurate and efficient, but also for the subsequent maintenance to build a solid foundation to craftsmanship to guard the stable operation of diesel engine valve assembly, unlocking the lasting surging power “code”.