1, when the assembly torque torque is too large, uneven force. As there is no strict torque wrench used in the assembly, the specific tightening torque is not well understood, and the tighter the better; the tightening of the connecting rod bolt with a longer forcing rod, the tightening torque is too large, exceeding the bolt material The yield limit causes the connecting rod bolt to yield and deform, causing it to break under excessive impact due to the impact load. It should be emphasized that the connecting rod bolt must be tightened according to the standard. Do not think that the tighter the bigger the better.
2. The connecting rod of the diesel engine is divided into multiple levels. Attention should be paid to the use of connecting rods of different grades during maintenance. If the slapstick is not messed up or misplaced during the inspection, the connecting surface of the connecting rods will not be tightly fitted, and the connecting rod cover will loosen during the engine running, resulting in the breakage of the connecting rod bolts. WD615 series diesel engine connecting rod big head is oblique incision type, oblique cutting angle is 45°, connecting surface of connecting rod cover and connecting rod big head adopts 60° zigzag positioning structure, this structure has close fitting, accurate positioning, reliable and compact structure. specialty. If the connecting rod cover is disturbed or misplaced during the maintenance, it will inevitably result in poor positioning of the sawtooth on the joint surface, which may easily cause the loosening of the connecting rod cover during the operation of the engine and lead to the breakage of the connecting rod bolt.
3. If the diesel engine malfunctions during running or the piston is burned in the cylinder, the connecting rod bolt will be broken. If the engine has experienced overspeed faults during operation, a thorough inspection of the engine should be carried out. It is better to replace the connecting rod bolts. If there are severe cylinder pulls in individual cylinders during operation, the connecting rod should be replaced when replacing the cylinder piston assembly. Bolt replacement.
4, material issues, processing defects and heat treatment process problems will lead to the link bolt in the engine running break.