柴油機的連桿螺栓是一次性使用的，是不能重復利用的，連桿螺栓重復使用將極易導致斷裂，打壞發動機汽缸體，導致發動機報廢。是什么導致了柴油發電機組連桿螺栓斷裂的呢？連桿螺栓斷裂主要有四個方面：

The connecting rod bolts of diesel engines are disposable and cannot be reused. Reusing the connecting rod bolts can easily lead to breakage, damage to the engine cylinder block, and engine scrapping. What caused the connecting rod bolts of diesel generator sets to break? There are four main aspects of connecting rod bolt fracture:

裝配時扭緊力矩過大,用力不均勻。由于裝配中沒有嚴格的配用扭力扳手,具體扭緊力矩又不太了解,認為越緊越好;緊固連桿螺栓用較長的加力桿,扭緊力矩過大,超過了螺栓材料的屈服極限,使連桿螺栓出現屈服變形,使之在沖擊載荷的作用下因過度的伸長而斷裂。應強調的是,一定要按標準扭緊連桿螺栓,千萬不能認為越緊力量越大越好。

Excessive tightening torque during assembly and uneven force application. Due to the lack of strict torque wrenches during assembly and a lack of understanding of the specific tightening torque, it is believed that the tighter the better; The use of a longer force rod to tighten the connecting rod bolts results in excessive tightening torque, exceeding the yield limit of the bolt material, causing the connecting rod bolts to undergo yield deformation and fracture due to excessive elongation under impact loads. It should be emphasized that the connecting rod bolts must be tightened according to the standard, and the greater the tightening force, the better.

柴油機的連桿分多種級別,在檢修中應注意不能換用不同級別的連桿。如果在檢修中由于馬虎不仔細將連桿蓋搞亂錯裝,會造成連桿大頭結合面的配合不緊密,在發動機運行中會造成連桿蓋松動而導致連桿螺栓的斷裂。WD615系列柴油機連桿大頭為斜切口型,斜切角呈45°,連桿蓋和連桿大頭結合面采用60°鋸齒形定位結構,這種結構具有貼合緊密定位準確可靠結構緊湊的特點。如果在維修中將連桿蓋搞亂錯裝,勢必會造成結合面鋸齒定位不好,極易造成發動機在工作中連桿蓋的松動,而導致連桿螺栓的斷裂。

The connecting rods of diesel engines are classified into multiple levels, and attention should be paid not to replace them with different levels during maintenance. If the connecting rod cap is mishandled and mistakenly installed due to carelessness during maintenance, it will cause the mating surface of the connecting rod big end to not fit tightly. During engine operation, it will cause the connecting rod cap to loosen and lead to the fracture of the connecting rod bolts. The connecting rod big end of WD615 series diesel engines is a slanted cut with a 45 ° angle. The joint surface between the connecting rod cap and the connecting rod big end adopts a 60 ° serrated positioning structure, which has the characteristics of tight fitting, accurate and reliable positioning, and compact structure. If the connecting rod cap is mixed up and installed incorrectly during maintenance, it will inevitably cause poor alignment of the serrations on the joint surface, which can easily cause the engine to loosen the connecting rod cap during operation and lead to the fracture of the connecting rod bolts.

柴油機在運行中出現飛車故障或活塞在氣缸內燒死的故障,將連桿螺栓拉斷。如果發動機在使用中出現過飛車的故障,應對發動機做一次全面檢查,好更換連桿螺栓;如果在運行中個別氣缸出現過較嚴重的拉缸,在更換氣缸活塞組件時也應將連桿螺栓更換。

During operation, the diesel engine experiences a malfunction of speeding or the piston burns out in the cylinder, causing the connecting rod bolts to break. If the engine has experienced speeding faults during use, a comprehensive inspection of the engine should be conducted to replace the connecting rod bolts; If some cylinders have experienced severe cylinder pulling during operation, the connecting rod bolts should also be replaced when replacing the cylinder piston components.

材質問題加工缺陷及熱處理工藝問題也會導致連桿螺栓在發動機運行中出現斷裂。

Material issues, processing defects, and heat treatment process issues can also lead to the fracture of connecting rod bolts during engine operation.