The parts where cracks occur on Volvo diesel generator sets are often related to their structures. The parts where cracks occur on different types of Volvo diesel generator sets have certain regularity. Generally speaking, there are only three reasons for cracks in Volvo diesel generator sets. The cylinder block of Volvo diesel generator set has complex structure and uneven wall thickness. The rigidity of some weak parts of Volvo diesel generator set is low, and Volvo Diesel generator set is easy to crack. The stress concentration of Volvo diesel generator set occurs at the transition of machined parts, unprocessed parts and wall thickness. When these stresses are superimposed with the residual stress when the construction stops, Volvo diesel generator set is easy to crack.
In cold winter, the cooling water in the water jacket of the Volvo diesel generator set freezes and cracks, or the hot water bursts in cold winter, because the Volvo diesel generator set does not have antifreeze or fails to drain cooling water in time after shutdown. The internal combustion engine of Volvo diesel generator set suddenly adds cold water under high temperature, which causes excessive thermal stress on the body and cylinder head of Volvo diesel generator set and cracks on the body and cylinder head of Volvo diesel generator set. Due to the serious impact or collision caused by the accidental disassembly or handling of Volvo diesel generator set, the cylinder block or cylinder head of Volvo diesel generator set has cracks.
During the reaction of Volvo Diesel generator stack operation, the material of Volvo diesel generator set is subject to excessive thermal stress, and the internal combustion engine of Volvo diesel generator set is overloaded for a long time, and the stress of the body is increased. The water jacket scale is too thick, which reduces the cooling water passing area of Volvo diesel generator set. The heat transfer of Volvo diesel generator set scale is poor, which reduces the heat dissipation performance of Volvo diesel generator set. The performance of Volvo diesel generator set, especially when the water channel near the cylinder, valve seat and air inlet and exhaust hole of Volvo diesel generator set is blocked, it will seriously affect its heat dissipation, raise the local working temperature of Volvo diesel generator set, and cause cracks due to excessive thermal stress. In the case of insufficient warm-up of Volvo diesel generator set, the load of Volvo diesel generator set increases rapidly, resulting in serious uneven temperature changes in the cylinder block and cylinder head of Volvo diesel generator set, resulting in cracks.
The repair quality is not high, and the technical requirements cannot be strictly implemented in the maintenance of Volvo diesel generator sets. For example, the cylinder head nuts of Volvo diesel generator sets are not tightened according to the specified sequence and torque, the tightening force is uneven, and the cylinder head nuts do not meet the specified requirements. When installing the valve seat ring, there is no basis for air supply, and proper pressure interference is selected, such as the material and machining accuracy of the door seat. Volvo diesel generator set will also cause cracks. When tightening the cylinder head nuts of Volvo diesel generator set, use a torque wrench with accurate reading to symmetrically tighten them to the specified force.
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