Some problems needing attention when water pump of 55 kW flood resistant diesel engine encounters failure
1、 Only replace the plunger and nozzle, ignore the technical status of the oil delivery valve. The residual pressure of high pressure oil pipe will be too high after the oil outlet valve is worn. Cause the fuel injection nozzle to cut off the fuel not simply and drip oil. The diesel engine exhaust smoke, knock cylinder, unstable operation. The method is to check the oil outlet valve. Use 0-600 kg / cm2 pressure gauge to test. When the needle drops from 200kg to 180kg / cm2, the pressure holding time should be greater than 15s, otherwise the oil outlet valve should be replaced. Or put the high-pressure oil pipe port upward, pump out the diesel oil, make the oil level flush with the pipe orifice, and put the throttle back to the stop supply position. If the driving wheel is reversed for half a circle, the diesel oil at the high-pressure oil pipe port is not reversed, it is qualified. Otherwise, replace the oil outlet valve.
2、 Only adjust valve clearance and ignore valve timing. Most people just adjust the valve clearance according to the manual. The valve timing is ignored. Especially for the aging machine, the geometry changes after the cam is worn. As a result, the valve will open late and close early, resulting in insufficient intake, dirty exhaust, increased fuel consumption and reduced power. Therefore, it is necessary to adjust the valve clearance according to the engine conditions. The valve clearance should be reduced to compensate for the valve timing error. For example, for S195 diesel engine, the valve timing changes 3 degrees when the valve clearance decreases by 0.1 mm. However, the valve clearance should not be less than 0.2mm, otherwise the valve will not be closed tightly due to expansion. If the valve clearance is 0.2 mm, and the valve timing error is still more than 5 degrees. If the working condition of diesel engine deteriorates obviously, the camshaft should be replaced.
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3、 Only look at the oil pan oil quantity, ignore the oil quality. Many people only replenish the engine oil, never check the quality of the oil and do not change it. However, the waste oil that should be replaced contains a lot of oxidants and metal chips, which makes the lubrication performance decline. Therefore, the oil quality in the machine should be checked at any time. The general method is to grind the oil by hand. If you feel mechanical impurities or viscosity is not enough, it should be replaced in time. Another way to check is to drop used oil on white paper. If the black spot is small and light in color, and the surrounding yellow moistening trace is large, it can be used continuously. If the spot is black and large, and there is no yellow trace around, it should be replaced.
4、 Only know how to maintain the air filter, ignore the air short circuit. There are many reasons for air short circuit. If the air filter fixed on the three wheel frame, its intake pipe welding is not solid. There is no sealing gasket at the joint of intake pipe. The intake pipe is inserted into the rubber hose loosely without clamp. The rupture of intake hose was not found, and the rubber ring in the air filter was missing. These will cause air short circuit, make the unfiltered air into the cylinder, aggravate the wear of cylinder, piston, piston ring, valve and other parts.
5、 Only clean the oil filter screen and ignore the cleaning of the purification oil chamber. Most of the connecting rod journal of diesel engine is hollow with oil blockage at both ends, which is called purification chamber. The oil that lubricates the connecting rod bearing bush is under the action of centrifugal force. The impurity is attached to the cavity wall to improve the lubrication quality. Generally, the oil plug should be removed every 500 hours. The impurities in the purified oil chamber and oil passage should be removed according to the specified method. mp.