Automobile crankshaft bearing ring failure diagnosis and elimination - bearing knowledge

1 fault phenomenon. When the engine speed changes suddenly, have obvious and heavy continuous 'Cheng chamber' sound, accompanied by engine dithering phenomenon. 2. The engine speed increases, noise increases. 3. Change the engine load, and the noise. Second, the cause of the problem 1. Crankshaft crankshaft journal bearing with wear, makes the fitting clearance between the larger, the voice. 2. Crankshaft bearing of the bolt is loose. 3. The crankshaft bearing lubrication bad make alloy burned or fall off. 4. Crank shaft axial clearance is too large, lead to the crankshaft both before and after the move, axial end face and the crankshaft thrust washer collisions and popping sounds. 5. The crankshaft bent, broken, produce sound during operation. 6. The flywheel bolt is loose. Three, 1 failure diagnosis and elimination. Remove the oil filling flap, give ear to the oil filling mouth examine listens, at the same time and changed the speed of the engine test. Engine speed suddenly change, a depressing continuous 'Cheng Cheng' metal tapping, serious when will produce great vibration, engine crankshaft bearing ring for 2. By the test of single cylinder broken fire, noise did not change, then using the adjacent two cylinder fire test. If a two cylinder is broken after fire, less noise, that is the crankshaft bearing ring between the two cylinder 3. Make the engine at high speed, the vibration of the body will produce larger, at the same time, the oil pressure will be markedly reduced. It shows that the crankshaft bearing clearance is too large or bearing alloy layer falls off 4. Put the oil, remove the oil sump inspection ( 1) Found in oil or oil sump wall bearing alloy particles, that falls off the crankshaft bearing alloy, should replace the same level of bearing. ( 2) Check if the crankshaft bearing cap bolts loose, if loose, should be in accordance with the provisions, torque tighten. ( 3) Use the method of crankshaft bearing clearance inspection check whether the bearing clearance is too big. If is too big, should replace new bearing the same level. 5. When on the clutch pedal, noise decrease or disappear. With the lever move flywheel or the crank arm. If the axial momentum is too big, should replace the thrust bearing. 6. With the increase of engine temperature ( Oil viscosity lower) , noise increased obviously, when the engine speed to high speed, the noise is mixed and disorderly phenomena, illustrate the crankshaft bending, should remove the alignment ( Or replacement) 。 7. If the noise appears in at the back of the engine, and in a sudden increase or reduce the engine speed instantly let out a loud sound, illustrate the flywheel fastening bolt looseness, should be in accordance with the provisions, torque tighten.