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The connecting rod bolts of diesel engines are used once and are not allowed to be reused. If the connecting rod bolt is repeatedly used, due to the greater stress, the bolt is elongated, which can easily cause the bearing bush to fail due to insufficient bolt fastening force; at the same time, due to the lack of fastening force, the clearance between the bearing and the crankshaft journal Increased, resulting in low oil pressure, resulting in excessive wear of the bearing and tile burning accident.
Precaution:
1 When carrying out 12,000 km of secondary maintenance every time, the engine oil pan should be disassembled to check the use of the engine bush. If the individual bearing bushes are found to be too wide, they should be replaced. The replacement should also replace the connecting rod bolts. In normal operation, if you find that the engine is running unsteadily and there is abnormal sound, you should stop and check it in time.
2 Each repair should check the newly replaced connecting rod bolts, should pay attention to the head, the guiding part, the threaded parts of the bolt whether there are cracks or dents, thread teeth shape, pitch is abnormal, there are exceptions should not be determined.
3 When assembling the connecting rod cover, apply a torque wrench and tighten according to the specified standards to prevent the torque from being too large or too small. Too big or too small can easily cause damage to the connecting rod cover.
4Use connecting rod bolts produced by supporting plants. Unmatched connecting rod bolts will expand in high-strength movements, causing serious damage to the connecting rod bolts.