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The increase in the oil level of the diesel engine oil pan is caused by diesel or water entering the oil pan. The oil level of some diesel engines without crankshaft rear skeleton oil seals may also increase because of the hydraulic transmission oil entering the oil pan. Diesel entering the engine oil will reduce the viscosity of the engine oil and deteriorate the engine oil, causing the relative motion surfaces to fail to form an oil film and aggravate the wear; water entering the engine oil will emulsify the engine oil and lose its lubricating effect. Therefore, once the oil level of the oil pan is found to rise, the machine should be stopped for inspection, troubleshooting, and oil replacement before running. The main reasons for the increase in the oil level of the oil pan are:
1. A cylinder (or several cylinders) of the diesel engine does not work or works poorly
Because the injector needle valve is stuck in the open state or the injection pressure is low, poor atomization occurs, so that the diesel injected into the cylinder cannot completely form a mixture and burn, but flows into the oil pan from the piston ring, cylinder liner and piston side, causing the oil level of the oil pan to rise. In this case, the “cylinder disconnection method” can be used to find out which cylinder or cylinders are not working or working poorly, find out the fault and eliminate it. If necessary, the injector can be tested.
2. Water in the oil pan causes the oil level to rise
After water enters the oil pan, the engine oil will emulsify. The main reasons for water in the oil pan are:
① The cylinder gasket is burned and leaks. At this time, check the water tank and you will find that there are “bubbling” and “boiling” phenomena in the water tank. The cylinder gasket should be checked and replaced;
② The cylinder liner is cracked, so that the cooling water penetrates into the cylinder and flows into the oil pan. The cylinder liner should be replaced. In this case, the water tank will also “bubble” and “boil”. Especially in winter, due to “sharp cooling”, the phenomenon of cylinder cracking is more common;
③ The cylinder liner water blocking ring fails and leaks, and the water blocking ring should be replaced. In this case, there is no “bubbling” phenomenon in the water tank due to water leakage.
In addition, some diesel engines, due to the damage of the crankshaft rear oil seal (or not the skeleton oil seal), if the torque converter leaks seriously, the hydraulic transmission oil will leak into the oil pan, causing the oil level to rise. At this time, there is no diesel smell in the oil, and it is not emulsified, and the torque converter should be repaired.
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Post time: Dec-10-2024