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Poured bearings

Posted by Henry in MI on August 23rd, 2000 04:03 PM
In reply to Poured bearings by Henry in MI on August 23rd, 2000 05:16 AM [Go to top of thread]

Leesa, Here is a brief rundown on the procedure I have used. Scrape, mill or pull as much of the old babbitt metal out as you can and throw in in the heating pot. Put the shaft in place against the stationary half of the casting. Use modeling clay to build a tinker's dam to fill in the space between the shaft and the casting. Light the acetalene torch but don't start the oxygen. This will give you a very sooty flame. Smoke the shaft completely as the soot will act as a release agent for the casting process. If your babbitt pot doesn't have itsown heat source, you can use the torch to heat the babbitt metal to a liquid. When it is molten, pour the babbitt metal into the space between the shaft and the casting.

When this has cooled and the metal is totally hard, remove the shaft. Use the shaft and the marks on it to align the cap with the spot that it should go on the shaft and repeat the process. When this has cooled, remove the shaft and scrape a few thousanths out off the bearing surface. Also, scrape any excess off the faces of the bearings on each side. Drill any oil holes and chamfer. You may also want to scrape in fluid reservoirs from the oil holes if the original had them. This just about does it. Bolt the cap and check the fit and scrape more if necessary.

Good luck
Henry in MI

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