Preventive measures for hexagonal bolts

① When performing secondary maintenance every 12000 km of operation, the engine oil pan should be disassembled to check the usage of the engine bearing shells. If any individual bearing shells have excessive clearance, they should be replaced. At the same time, the connecting rod bolts should also be replaced. If the engine is found to be running unevenly and making abnormal noises during normal operation, it should also be stopped and checked in a timely manner During each repair, the newly replaced connecting rod bolts should be inspected, and attention should be paid to whether there are cracks or dents in the head, guide part, and thread parts of the bolts, as well as whether the tooth shape and pitch of the thread are abnormal. Any abnormal situations should be resolutely avoided When assembling the connecting rod cap, a torque wrench should be used to tighten according to the specified standards to prevent excessive or insufficient torque. ④ Select connecting rod bolts produced by supporting factories.