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The crankshaft box failure factors
Update:2017-02-04 Tags:the

When the crankshaft box generatorof exhaust gas recirculation or poor circulation, lead to diesel engine combustion chamber deposits, crankcase sludge deposition, surface coating adhesion, piston rings, oil conveying an important factor of corrosion and wear. Diesel engine crankcase ventilation is poor, in the intake stroke will result in the combustion chamber pressure is too large (far lower than in the crankcase pressure), and make a lot of lubricating oil leakage into the combustion chamber, generate large amounts of carbon surface accumulation of combustion chamber and the piston ring. At the same time, a large number of high temperature exhaust gas accumulated in crankcase, also causes a high body temperature crankcase oil and song of the piston ring gap, speed up oil oxidation and deterioration. Lubricating oil soluble solid oxide, oxidation at high temperature, oxygen and metal catalyst and generate complex oxides and unsaturated compound paint adhered on the surface of the mixture on the surface of the part, further polycondensation and combustible gas mixture of carbon oxidation into membrane, attached to the crankcase surfaces and connecting rod, piston skirt and piston pin of the surface of the part. Raise the body temperature and the lubricating oil, generate more paint film. And high oil temperature will lead to oil gets thinner, evaporation, become oil mist particles, through ventilation tube suction chamber; Serious, can also lead to out of control of diesel engine, such as fault. When the temperature is too low, into the crankcase emission and combustion of hydrocarbon acid deposition and condensation after the formation of the lubricating oil, lubricating oil deteriorating further oxidation and corrosion wear parts. In addition, some high boiling point of the waste gas and water vapor condensation and the mixture of oil, but also make the oil and oil and gas in the liquid phase oxidation further condensation, forming sticky substance. Viscous material further in the crankcase and the solid material, water vapor, carbon dioxide dust, bushes and lubricating oil oxidation combined together to form sludge and deposition shell oil, lubricating oil, and at the bottom of the filter net, result in plugging of oil. Data show that in recent years in the production of high strength, high compression ratio and fuel direct injection (DGI) and smaller volume of the base oil ship diesel engine, if the crankcase ventilation is poor, can also lead to lubricant viscosity, increasing oxygen content and acidity, lubricating oil smoke caused by idle (carbon sediments, colloidal suspension in the lubricating oil) generation. Also not cycle gas inside the crankshaft or poor circulation, will lead to the engine idle speed instability, abnormal exhaust, blackouts, any increase in fuel consumption and heat it is hard to start. In the crankcase exhaust the main factors influencing the poverty or not exhaust: one-way flow control damaged or open the card lag; Ventilation and depression blockade, waste oil (water) gas separator blockage, and connect the hose aging caused by the bonds. Crankcase poor inhale or ingest, lead to the excessive consumption of lubricating oil, the main factors of accelerated oxidation.

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