In order to ensure the normal operation of the engine, the pressure of the oil pump and the oil pressure of the main oil passage must be appropriate. When the engine speed increases or the oil becomes rich, the oil pressure will increase, causing too much oil splashed on the cylinder wall. The oil will enter the combustion chamber in large quantities, resulting in increased coke and oil consumption. In severe cases, the machine parts may be damaged. Therefore, the NT855 engine divides the secondary oil pressure in the lubricating oil circuit: First, a bypass valve is provided at the outlet of the oil pump, and its opening pressure is 0.89-0.94 MPa. Second, the oil is set on the main oil filter before the organic oil. Pressure control valve, the opening pressure is (0.44 ± 0.04) MPa; when the oil pressure is too high, reach the respective control pressure, the valve is opened, so that part of the oil flows back to the oil pan, so that the oil pressure to normal values. When the engine is working, the engine oil will be deteriorated and contaminated by the action of high-temperature gas, impurities, and debris. Therefore, the engine oil often contains impurities such as various metal wear debris, carbon residue, ash, and gum. These impurities along with the oil into the friction surface, will accelerate the wear of the engine parts, block the oil, so that the engine does not get a good lubrication. The NT855 engine is equipped with a full-flow oil filter and a bypass bypass filter in addition to the filter in the lubricating oil circuit. The full-flow oil filter is connected in series with the main oil passage, its role is to filter out the larger impurities in the oil; at the same time, a safety valve and the oil filter are connected in parallel, and the opening pressure of the safety valve is 0.28--0.35 MPa, ensuring that When the oil filter is seriously blocked, the oil can enter the lubrication points through the safety valve. The bypass bypass filter is connected in parallel with the main oil passage. Its function is to remove minor impurities from the oil and directly flow back to the oil sump through the bypass bypass filter.
1. Precautions for the use and replacement of oil filter Oil filter is a part that needs to be replaced frequently. Replacement, correct installation and use of oil filter according to the engine's usage regulations are critical to the normal lubrication of the engine. When using and installing, pay attention to the following aspects:
(1) Before installing full-flow and bypass-type oil filters, check whether the pressure of the filter housing has been traced or not, and whether the seal has been damaged; then, add the specified number to the filter. Oil, saturate the filter element to make it in working condition, and apply a small amount of oil or butter to the two filter pads respectively, and screw it into the oil filter seat.
(2) After the filter that has been filled with a portion of the oil is allowed to stand for 5 minutes, add oil to the filter again and repeat it several times until it is assured that the air is completely discharged and the filter is full of oil.
(3) When installing, tighten with both hands and do not allow tightening with a wrench or pipe wrench. Since the filter housing is made of thin sheet metal, when the tube clamp is used to tighten it, it will deform and squeeze the filter element to cause the oil path to become sluggish; if it is tightened too tightly, the ring seal gasket will be screwed or deformed to cause oil leakage. . Since the oil filter is a one-time use piece, it cannot be removed by hand when it is removed, and it can be removed with a pipe wrench or other tools.
(4) After replacing the oil filter, the engine should be started and run for 5 to 10 minutes. The sealing effect of the seal ring should be carefully observed and no oil leakage should occur.
(5) The oil filter assembly can only be used once and cannot be reused; the oil filter should be replaced at the same time as the oil is regularly changed according to the instruction manual, and the oil should be added.
2. The oil pressure can greatly reduce the troubleshooting method. When the oil pressure suddenly drops, check the machine immediately to prevent the accident from expanding. The significant drop in oil pressure does not necessarily mean that the connecting rod or crankshaft is damaged. Do not dismantle the connecting rod or crankshaft easily. Look for the cause in the following order:
(1) In the case of normal liquid level in the oil pan and no fault in the electrical line, for the inductive oil pressure gauge, check the pressure gauge and sensor: Ground the sensor terminal with a screwdriver, if the pointer still indicates " 0" below, indicating that the pressure gauge is damaged, it should be replaced; remove the sensor to make the housing ground, with a tipless nail against the sensor diaphragm, if the pointer is still in the "0" position, indicating the sensor failure, Should be replaced. For an inductive oil pressure gauge, simply check the pressure gauge, ie start the engine and observe that the pressure indication is normal and replace the pressure gauge if necessary. If you still can not eliminate the fault, then carefully check the oil circuit.
(2) Put the oil in the oil pan into a clean oil drum. Use your finger to dip a little bit of oil. Observe in the sun whether or not there is a bright sheet in the oil. If there is any, the bearing pad will be peeled off. At this point, remove 1-2 bearings for inspection.
(3) If no bearing alloy is found in the oil, remove the oil pan for further inspection by rotating the crankshaft several times to see if the rotation of the crankshaft is flexible, and then observe if the oil pump is rotating abnormally or not. Is the gear stuck? According to experience, sudden oil pressure in the oil circuit is mostly caused by stuck oil particles stuck in hard particles.
3. Causes of oil level rise in the oil sump and how to eliminate it The oil level in the oil sump of the NT855 engine should always be maintained between the upper and lower scales of the oil dipstick. If it is found that the oil level does not drop, it rises, indicating that the oil level rises. Shell oil is mixed with water or diesel oil. It should be searched and excluded from the following aspects.
(1) Leakage of the conical plug will lead to leakage; the NT855 engine's cylinder water passage and oil passage are sealed with tapered plugs. If water leaks, the water will enter the oil pan and the oil level will rise. At this point, the plug should be coated with 307 sealant and then loaded.
(2) The cylinder head gasket is damaged, and the cylinder head is cracked. The water flows downstream along the valve push rod hole to the oil pan, causing the oil level to rise. The cylinder sleeve is corroded, cracked, or blisters, and the cylinder liner water blocking ring is aged. All the water will make the water enter the oil pan through the cylinder liner, which will cause the oil level to rise; when the cylinder mat is damaged, the cold water in the radiator will bubble up. In severe cases, the water will overflow, and often accompanied by a "click" sound. After the search for the cause is correct, change the cylinder head gasket, cylinder liner water stop ring, or cylinder liner repair.
(3) If the machine body, especially the body cylinder water chamber parts have blisters, remove the oil pan can be found after the main shaft hole at the water; at this time, in order to ensure the normal use of the engine, the cylinder should be replaced immediately.
(4) If the oil cooler tube bundle breaks or opens, the engine oil will enter the coolant when the engine is working. If it does not work, the water will leak into the oil pan and cause the oil level to rise. If there is oil in the water and water in the oil, it can be initially determined that the oil cooler is faulty. The oil cooler can be removed and placed in water. One end is blocked and compressed air is introduced to see where the leak is. The weld can be repaired after the leak is found; if it cannot be repaired, the oil cooler should be replaced.
(5) The method of inspection of the water in the oil pan is as follows: Firstly, observe the oil color; the color of the oil after flooding is white; second, use oil dipstick to drop a few drops of oil on the test paper, and then fill the paper with water. Watermarks will be produced. Under normal circumstances, the oil drain plug can be released to allow the water to drain, and if necessary, replace the oil in the oil pan.
(6) Loose connection of oil inlet connector or oil return connector of fuel injector, wrong fitting of fuel injector measuring cup, damage of O-ring of fuel injector measuring cup, crack of injector body or injector measuring cup, and diesel inflow into cylinder. After entering the oil pan through the gap between the piston and cylinder liner, the oil level rises; in this case, the engine is often accompanied by unstable work and black smoke. At this time, the broken cylinder method can be used to determine which cylinder's injector is not working.
(7) In the construction machinery for intermittent operation in winter, in order to ensure that all parts of the engine are in good condition, the engine must be operated from time to time and allowed to run at idle speed. This will cause the diesel fuel to continuously drip into the oil pan, thus increasing the liquid level. At this point, idle time should be reduced.
4. Causes of exhaust pipe drip oil
(1) The valves and valve guides are worn out, causing large amounts of oil to leak into the cylinders from there.
(2) The piston and liner clearances exceed the specified limit and a large amount of oil is pumped.
(3) When the engine is overhauled, the air ring is installed incorrectly; or when the engine is running, the piston ring slowly moves under the action of various forces, and finally the piston ring counterpart occurs, causing a large amount of oil to enter the cylinder.
(4) The filling fluid level is too high.
In all four cases, there will be engine burning oil, exhaust pipe blue smoke, and incomplete combustion of the engine oil is discharged out of the cylinder and into the exhaust pipe, resulting in exhaust pipe drip oil phenomenon.
Church candle is used for church, for praying,for memorial. A candle lighted by a worshiper in a church.
Candle originated in the original era of the torch. Primitive man fat or wax like on bark or wood, tied together, made for the lighting of the torch. At about third Century BC the beeswax candles may be seen today. In the west, there is a period of time, the temple in beekeeping to self-made wax, this is mainly because the Catholic church that Mila is a symbol of a virgin conception, so the beeswax as pure light, dedicated to the altar of the church. From the existing literature, beeswax in our country have roughly same time with the west, Japan is in the Nara period (710 to 784 years) in our country was introduced into the candle of, and compared to modern candle, ancient candles have many shortcomings. The Tang Dynasty poet Li Shangyin, "when he cut a total of west window candle" of the poem
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