Small diesel engine to burn the cause and the matters needing attention

Small diesel engine burning tile the cause and the matters needing attention - 2019 11 - 21 Zhang Jingxiang ( Heilongjiang province MuLeng city downtown a town agricultural service center) 1. Caused by long time overload operation launched the pilot time overload operation temperature is too high, make the engine oil is thinning, viscosity drop drop, bearing and shaft neck increases the friction caused by burn. Therefore, we should put an end to locomotive overload operation for a long time. 2. Relevant parts wear or improper clearance fit machine oil pump after working for a long time, the gear wear and tear, the tooth gap increases, the pump oil pressure drop; Due to the high temperature and lubrication hole blockage, make the oil pump, driven gear jammed, rather than to the engine oil lubrication system. Spindle tile or connecting rod wear or improper fit clearance, a greater than small will influence the formation of lubricating film, tile burning. Should be paid attention to in the repair, parts size and cooperate relationship, should also pay attention to the crankshaft neck at the same time the ovality and taper, if wear in excess of the prescribed, or replace the crankshaft should be grinding axis, with corresponding bearing shell again. 3. Use oil 3 do not conform to the requirements of the locomotive technology. 1 oil aging metamorphism and low viscosity. So-called oil aging metamorphism, in addition to the impurities dirt over specified value, is mainly refers to the oil viscosity decreased or completely lost. The nature of the oil viscosity is very important, the correct engine oil viscosity is the key to implement correct lubrication for engine. When the oil viscosity is low, will affect the formation of oil film bearing capacity. In order to prevent burn caused by oil aging metamorphism, machinist should be regularly check the oil in the quality in the process of use. In without detection instruments and equipment, can use shake bubbles, smell smell, watch color, viscosity test and simple method to check the oil quality. The normal oil, swings in glass bottles, little and big, the bubbles last time longer, and adhesion in the bottle wall too much; The pungent odor, and slightly acidic; Observe the color, is green blue to black, dark brown and luster feeling; Twist with your fingers, have smooth sticky feeling, after two fingers slightly loose, will have the strips of formation. Degenerative aging oil, its color is dark brown without luster, the deterioration of the oil it is difficult to form oil film, should be replaced. 3. 2 oil model for choosing wrong, will cause poor lubrication of diesel engine, cause the tile burning failure. Should choose 30 cc grade diesel engine oil during the winter, should choose 40 cc grade diesel engine oil in the summer. In addition, the selection of oil diesel engine wear condition, should also be considered for a new diesel engine because of the moving parts fit clearance is lesser, choose oil viscosity can be appropriately lower; For old diesel engine, because there are some parts wear and tear, fit clearance is bigger, can choose a little older viscosity oil. 3. 3 the oil in water. The reason a is added oil containing water. Second, the cylinder sleeve hydrosphere after long-term use and spoiled or damaged when installation, sealing mechanism, cooling water infiltration within the oil sump. At this time there will be a sump oil plane is higher and higher. Encounter this situation, should be timely change of resistance hydrosphere. 4. The fault 4 lubricating oil way. 1 for many times, a connecting rod bearing shell or a spindle tile continuous burning accident, should review the flow condition of crankshaft oil duct, tile and technology condition on the surface of the journal. 4. 2 the plane down the pump, make set filter immersed in the oil, turn the pump shaft by hand, as a pumping test. If found to have a lot of bubble random oil from the oil outlet, plug pressure limiting valve outside air holes; Continue to pump oil, if you can make the foam disappeared, show that the pressure limiting valve piston and cylinder fit clearance is too large. Such as pumping oil, no bubble, cloth plug the oil outlet, with the hand hold down hard, continue to motive oil pump shaft. Feel resistance is big, so difficult to rotate, the oil pump performance is good. Dismantle the abrasion of oil pump, check if the oil pump is normal, should examine the bearing clearance, and the collapse of the engine repair when necessary. 4. 3 check a main oil pressure limiting valve. If the pressure limiting valve spring force, the oil will flow through the drain port back to the oil pan, reach regulation of the oil pressure, oil cannot reach the lubrication parts. After the adjustment, will be pumping oil pump oil, the thumb to resist pressure limiting valve spring, when the rotary pump shaft should feel some pressure, adjusting screw in this fashion, when the engine at normal temperature, oil pressure should comply with the provisions of the standard. If the oil pressure is too low, that pressure limiting spring force is too small, should be appropriate to reduce pressure washers or replace spring, until oil pressure conform to the prescribed standards. 4. 4 oil filter filter blockage, or oil filter on the relief valve opening pressure adjustment is too low, will cause the premature lubricant oil return, will also affect the lubrication oil pressure of the system. If such faults found in repair, should remove dirt, adjusted to the correct working pressure range or replace has wear and damage of parts. 5. In the amount of oil in the oil pan is insufficient small diesel engine under the rated power, its normal oil consumption is 6. 8 ~ 8. 16 g /千瓦• h。 Should be, depending on the model, a machinist, check the oil before the car oil level, is insufficient to add sufficient oil ( Usually add to the amount of oil 'scale in the middle of the advisable) 。 Some diesel engine machine oil consumption exceeds the limit, even burning, oil leakage is serious, the machine working in this kind of circumstance, especially for a long time at full capacity, the machinist if not timely supplement oil, most likely to cause the tile burning failure, therefore, should pay special attention to the oil pressure gauge readings or oil indicator. Find out why, if it is abnormal troubleshooting before operation. Source: 'friends of the farmers get rich'