Vision of the high temperature FAG bearing ring on troubleshooting methods

Removed in order to determine whether the high temperature of bearing can be used again, check after bearing clean, carefully check the raceway surface, rolling surface, cooperate with the state, the abrasion of cage, FAG bearing clearance increases, 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. FAG bearing separation type 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 FAG bearing the importance of 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 a FAG 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 high temperature 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 the high temperature alloy bearing ablation.