According to its design requirements, the bearing needs to be replaced at least once every six months, and in conventional use, there is often a bearing failure, and the cause of failure is composed of a variety of reasons.
How will you analyse whether journal bearing (fitted on place) is in good condition or not ? How to make out only by looking that clearance between bearing and keep has increased? Ans.) while doing a crankcase inspection of we found red powder appearance due to fretting then it can be suspected that journal bearing is weared down.
The casting of the alloy layer has defects, there are microcracks or hidden dangers of shelling, the surface is rough, and there are pores inside, and it wears quickly after being put into operation
