The high-pressure hose connecting the two hydraulic cylinders is positioned in a forward bend, closely following the crankshaft gear near the ninth main bearing. This configuration introduces safety risks, such as the potential for the joint to shift and cause the hose to bend backward, which can obstruct the operator's line of sight. As a result, the main bearing tensioner was damaged. After thorough analysis and considering feedback from on-site operators, the design was modified by increasing the height of the lower part of the cylinder while simultaneously reducing the height of the cap hole. The high-pressure hose was replaced with a rigid straight tube and installed with a safety shield to enhance operational safety.
In the prototype of the cylinder head Bolt tensioner, the four hydraulic cylinders were connected using a shared hydraulic system. During testing, it was observed that the piston of the last cylinder moved downward more than the others after the system was unloaded, indicating poor retraction performance. To ensure synchronization among all four cylinders, reduce manual effort, improve efficiency, and maintain safety, the diameter of the oil pipes and joints was carefully selected. Under the same test conditions, high-pressure hoses were re-purchased, and different diameters of rigid oil pipes were designed, manufactured, and tested in sequence. Comparative experiments were conducted to evaluate performance, and the rigid pipe with the optimal diameter was ultimately chosen.
Additionally, during operation, it was noted that the lever provided for tightening nuts had a short service life. This was due to oil and sand accumulation between the Nut and the Screw during disassembly, making the lever difficult to use. The original material was too hard, leading to breakage, or too soft, causing deformation. Eventually, the lever failed on the diesel engine. Although the valve stem was improved, its service life remained unsatisfactory, and this issue still requires further resolution.
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