Cause of the fault: 2 The connecting rods of the diesel engine are divided into multiple levels, and care should be taken not to use different levels of connecting rods during the overhaul. 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 When the diesel engine malfunctions in operation or the piston is burned in the cylinder, the connecting rod bolt is 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 problems, machining defects, and heat treatment problems can also cause breakage of the connecting rod bolts during engine operation. Rotary Drilling Rubber Hose,Rotary Drilling Hose,Wire Spiraled Drill Hose,Oil Drilling Hose SHIJIAZHUANG STRONGFLEX I/E CO.,LTD. , https://www.hydraulichosegroup.com
The diesel engine is a highly-reinforced diesel engine. The connecting rod is subject to a greater impact load and is much larger than an ordinary diesel engine. Repeated use of a connecting rod bolt can easily lead to breakage and damage to the engine cylinder block, leading to engine scrap. In some units, even if the connecting rod bolts were replaced, a breakage failure occurred, and the connecting rod bolts of some engines suddenly broke during operation. Today's readers analyze the causes of failures such as connecting rod breakage.
1 The tightening torque is too large during assembly and the force is uneven. 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 Guangding should tighten the connecting rod bolts according to the standard. Do not think that the tighter the bigger the better.