High temperature bearing abnormal sound reasons and diagnosis

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1) bearing and journal wear excessive radial clearance is too large.crossed roller bearing
2) the bearing cap the fastening bolts loosening.
3) bearing alloy ablati on or fall off.
4) journal out of round.
5) bearings and bearing relative rotation.
Diagnosis:
1) engine speed from idle to speed excessively when sound is clear, as the speed increased, the sound is more prominent for the high-temperature bearing abnormal sound.
2) a cylinder misfire test, weakening or disappearance of sound, for that cylinder bearing ring.
3) regardless of the speed and high and low temperature audible, and the engine vibration to do off the fire test sound does not change, compared with the high temperature bearing alloy ablation.