When the engine is working under normal technical conditions, the oil level of the oil pan should gradually decrease because of the consumption of lubricating oil. The phenomenon of increased oil level indicates that the appearance of liquid intrusion during the work, and the amount of input is greater than the consumption, resulting in increased oil surface in the oil pan, indicating that the oil pan has infiltrated water, diesel or oil, they will reduce lubrication The effect may even cause the engine to “flyâ€, and it may also accelerate the wear of the parts or cause failures such as burning tiles and shafts. Increase the oil level in the engine oil sump and stop it immediately. After 30 minutes, loosen the oil drain plug. If there is any water that flows out of or flows out of the sediment, it indicates that the water flows into the oil; if the outflow oil turns Diluted, can be used on the oil dipstick on the toilet paper to a drop, if the oil traces quickly spread, diffuse and non-diffusion part of the color depth of the demarcation is obvious, it is mixed with diesel oil. In addition to the above two cases, it is mixed with oil. The reason for the increase in the oil level of the oil pan is as follows: First, the oil seeps into the oil pan 1. Failure or damage of self-tightening oil seal To prevent the oil in the bottom of the injection pump from flowing into the timing gear chamber, a self-tightening oil seal is installed in the front coupling plate of the fuel injection pump. If the oil seal fails or is damaged, the seal surface between the fuel injection pump camshaft and it is damaged, the oil in the fuel pump housing leaks into the timing gear chamber, and then leaks into the engine oil pan, increasing the oil level. . Second, the cooling water leaks into the oil pan 1. Cylinder head to rocker arm Lubricating oil Road bolts loose, such as 4125A, 4125 diesel engine, cylinder head to rocker lube oil road bolt loose, when the engine stops working, the lubricant without pressure, cooling water along the human lubrication system Increase the oil level in the oil pan. 2. Cylinder liner water blocking ring aging, damage due to diesel engine work serious water shortage or other reasons to make the diesel engine overheating, will make the water blocking ring heat aging deterioration, resulting in water seepage; installation of water blocking ring is too high, forcibly pressed into the cut, causing Leakage; body with shoulders with pull hair, burrs, due to cut through the water cut caused by leakage during installation. 3. When the cylinder mat burns, the water tank will bubble and the cooling water will have black oil on the surface. The cooling water will leak from the burned part of the cylinder mat and enter the oil pan through the valve push rod hole. Solution: After the cylinder head gasket is worn out, the new cylinder head gasket must be replaced, and the cylinder head nut must be properly installed and tightened as specified. 4. Cylinder liners, cylinder heads, and body cracks cause diesel engine cylinder liners, cylinder heads, and engine block cracks. The reason is that diesel engines start adding cold water in the event of water shortage or overheating. After cooling off in winter, no cooling water is released or the net cooling water is not discharged. Unevenly heated and unequal, sometimes the castings have turbulence and trachoma, cooling water will directly infiltrate into the oil pan to increase the oil level. 6. The paper pad of the gear chamber is damaged at the waterway, such as the 490 diesel engine. The paper pad of the gear chamber is damaged at the water channel, and water leaks into the oil pan through the gear chamber. Third, diesel leakage to the oil pan 1. If the valve rocker arm fixing bolt is loose, the valve rocker arm fixing bolt is loosened, the cylinder valve cannot be opened, the diesel in the spraying cylinder cannot be burned, and the cylinder oil flows into the oil pan to increase the oil level of the oil pan. Engine work "leaked leg". 2. The plunger set screw is loose or a small copper pad leaks from the interior of the injection pump through the fixing screw and flows from the gear chamber into the oil pan. 3. The injectors do not work properly. The individual cylinders of the engine do not work. Most of the cylinders are not working properly. This way, the diesel fuel injected into the combustion chamber flows through the gap between the piston, piston ring and cylinder wall to the oil pan. Increased oil level. 4. Pump pump housing base bearing surface has collapsed chipping, micro cracks or dirt. In this case, when the plunger is installed, the lower surface of the plunger sleeve shoulder can not be sealed with the bearing surface of the pump housing base. Diesel leaks from the surface of the fitting surface. The gear chamber to the oil pan.
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Solution: Replace the self-tightening oil seal.
2. Damage to the self-tightening oil seal of the driving gear shaft of the hydraulic oil pump is caused by damage to the self-tightening oil seal of the driving gear shaft of the hydraulic pump. The hydraulic oil flows into the engine oil pan along the timing gear chamber to make the oil in the oil pan. Increased face.
Solution: Replace the self-tightening oil seal.
Solution: Tighten the bolts in time.
Solution: When the body is equipped with shoulders with burrs or burrs, it should be leveled with sandpaper first; do not protrude too high when installing the water stop ring; when the water stop circle is low, use a black cloth to cut the width into a perimeter section of the water stop ring. The 3/4 strips are attached to the inner surface of the inner surface of the water blocker in the circumferential direction, and they are inserted into the trough, and then pressed with normal pressure.
Solution: When the cylinder liner, cylinder head, body or other parts have cracks or defects such as trachoma, air holes, etc., they can be repaired, welded or replaced with new ones according to the situation. When the length and width of the cylinder crack do not exceed 50X 0.3mm, or the pore size of the sand hole is not more than 0.3mm, repair can be done with a sealing agent. The plugging agent and cooling water are mixed and filled in a tank with a volume ratio of 1:20. You can.
5. Cylinder head water channel hole bulkhead loose or damaged If the cooling water used is not clean, the water jacket scale is too thick and the bulkhead is corroded and damaged. At this time, the water leaks from the bulkhead and enters the oil sump through the valve rod push rod hole to remove the cylinder. Covers can be observed.
Solution: Discard the cooling water, remove the damaged bulkhead, remove impurities and moisture from the dirt inside the hole, apply a layer of lacquer, and insert a new stuffy head.
Solution: Replace the new gear chamber pad.
Solution: Tighten the rocker fixing bolts in time.
Solution: Remove the fuel injection pump, and then reinstall the small copper pad. In this case, the plunger sleeve can move 2~3mm up and down in the pump body, but it cannot rotate.
Solution: Check and adjust the fuel injector so that it reaches the specified state. If it does not reach, replace the fuel injector assembly.
Solution: Remove the oil pump, clean with clean diesel, and then use a trowel or round file to trim the bearing surface, remove surface micro cracks, restore roughness, or cut two and plunger sleeve and oil pump housing base inner and outer diameter The same plastic film gasket is put on the plunger sleeve, and it is put into use after being tested for no leakage. 
