IKO thrust angular contact ball bearing sound out maintenance method

In order to determine whether removed IKO bearings can be used again, check after bearing clean, carefully check the raceway surface, rolling surface, cooperate with the state, the abrasion of cage, the increase of thrust angular contact ball bearing clearance, and presence of dimensional precision, abnormal falling damage. Not separated type ball bearing, the inner ring with one hand support levels, rotate the outer ring confirm whether smooth. Separation of tapered roller bearings and bearing, rolling body, the outer ring raceway surface can be respectively. Large imported bearing can't rotate with the hand, pay attention to check the rolling element and raceway and the appearance, such as, cage, guard the importance of thrust angular contact ball bearing high must check carefully. Phenomenon: 1) The engine idle speed has no obvious noise during operation, and high speed in the thrum 'giggle' ( ) emitted from crankcase 2) Hurry go after loosening the gas instantaneous sound more obvious. 3) No obvious change after the temperature rise. When the load increases, the sound is growing. 4) Sound more thrust angular contact ball bearing sound slow, short. Reasons: 1) Bearing and shaft neck wear too much, the radial clearance is too large. 2) The bolt bearing cover is loose. 3) Bearing alloy ablation or fall off. 4) Journal circles. 5) Bearing and the bearing relative rotation. Diagnosis: 1) Engine speed by the idle speed to medium speed when excessive noise is clear, with higher speed, the noise is more outstanding, for IKO bearing ring. 2) Fire test of a cylinder is carried out, the sound diminished or disappeared, for the cylinder bearing ring. 3) No matter what speed and temperature are sound and engine vibration, do fire test sound doesn't change, is for the ablation IKO bearing alloy.