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Chuck Yung EASA Senior Technical Support Specialist
When sleeve bearings are rebabbitted or replaced, an important step during assembly is to check the contact between the sleeve bearing and the journal which rides in it. The use of self-aligning sleeve bearings (also called spherical or ball fit) renders this step almost unnecessary. Still, cylindrical sleeve bearings should be inspected to make sure the contact area is sufficient.
Sleeve bearings, also known as babbitt bearings, plain bearings or white metal bearings, have been in use for over 150 years. For a detailed explanation of sleeve bearing design and operation, request the EASA 2007 Convention paper, “Sleeve Bearing Repair Tips,” or see Mechanical Repair Fundamentals of Electric Motors, 2nd Edition.
This article is specific to checking and correcting the wear pattern when installing a new sleeve bearing in an electric motor. Fitting a sleeve bearing is not difficult; it just requires some basic knowledge. An interesting bit of history: the toolkit provided with the old Model A Ford automobile included a babbitt knife for scraping crankshaft bearings. Imagine dismantling your engine alongside the road to remove and fit the babbitt bearings.
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This 40-page booklet provides great advice for obtaining the longest, most efficient and cost-effective operation from general and definite purpose electric motors.
This booklet covers topics such as:
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The Effect of Repair/Rewinding on Premium Efficiency/IE3 Motors Tests prove Premium Efficiency/IE3 Motors can be rewound without degrading efficiency.
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Recommended Practice for the Repair of Rotating Electrical Apparatus This is a must-have guide to the repair of rotating electrical machines. Its purpose is to establish recommended practices in each step of the rotating electrical apparatus rewinding and rebuilding processes.
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Revised May 2024 The EASA Technical Manual is the association's definitive and most complete publication. It's available FREE to members in an online format. Members can also download PDFs of the entire manual or individual sections.
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