Quote:
Originally Posted by Railcarmover
The most likely reason AER designed their own insert bearings is to use them in gravity fed and low pressure applications.Beware the engine builder who uses off the shelf insert bearings, the majority of them are designed for pressurized systems to keep them clean,cool and lubricated. Unfortunately when an insert bearing fails it wipes out what it bears,odds are the rear main journal took a beating in this failure as well.
Two benefits of poured babbit bearings is its ability to withstand gravity fed systems and conduct heat.When it fails it generally continues to protect what it bears by its sheer mass.unlike the thin babbit coating of the insert,the poured babbits thickness saves the rotating group from destruction for the most part.
Filters and oil are cheap..change them more often than less..
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I am a believer in poured Babbitt, if done correctly by a skilled mechanic. Inserts are OK, but my belief is inserts do not require as much skill to do.
Thanks rail car for the additional info. on types of inserts.
Am open to being corrected if this is incorrect.