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Antique Engine Archives All archived posts from 1999 to 2004 when SmokStak was on EnginAds. This is a read-only board.

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Replacing Babbit for main bearings


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  #1  
Old 01-27-2002, 12:17:56 PM
Bob Johnson
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Default Replacing Babbit for main bearings

I am wanting to try to replace the babbit main bearings for my 1 #/$ HP Associated air cooled engine. My plan is : make a mandrel slightly undersize to reach acrossed both main bearings and extend out passsed the block 1" on both sides. I will need a baseplate and two supports to bolt to each end of the mandrel to hold it in place. I want to make two metal covers to act as a dam on the inside of the block mounted around the Mandrel to hold the babbit in. I would then fasten all together and lay the block on its side with support under to make level. I would pour each bearing seperately aand then remove the bearing caps and remove the mandrel. From there it would be scraping to seat the crankshaft into the bearings. What might I be doing wrong or might there be some way to do it better from some one who has done This? Thank you all
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  #2  
Old 01-27-2002, 12:24:58 PM
Bill Hazzard
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Default Re: Replacing Babbit for main bearings

Sounds like a good way of doing the job to me. I have found that the babbit shrinks some and makes the bore slightly under size so I use a mandrel of the same size of the shaft and I still have to scrape some.
  #3  
Old 01-27-2002, 12:56:43 PM
Kid Dynamo
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Default Re: Replacing Babbit for main bearings

You should shim the caps apart, but I'm not the guy to say how. Kid D
  #4  
Old 01-27-2002, 01:12:45 PM
John Hammink
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Default Re: Replacing Babbit for main bearings

Bob,Harry Terpstra an engine friend of me made an interesting setup for pouring new bearings in his Sparta engine. The pipe he used is of stainless steel, it doesn't stick to babbit he said. Take a look at the page, maybe it's of your help. And if you be there, see the rest of his home page, it's worth your time. Regards, John H. in Holland.

j.g.hammink@quicknet.nl mail bounces


Pouring bearings.
  #5  
Old 01-27-2002, 01:23:35 PM
Al Hettich
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Default Re: Replacing Babbit for main bearings

You must shim the caps apart. Apiece of 10 or 12 ga. sheet metal against the shaft on both sides should do it. I have used wood to make the babbit dams. They are easy to carve, and only smoke the place up a little. The babbit metal cools fairly quickly, but I keep water around just in case. I drill a sprue in one side and the riser in the other. Cut a notch in the ends to allow the metal to fill the bottom and top. When it is cool, chip away the wood and cut the flow channels. You got a brand new 80 year old bearing. Some scraping and fitting and it is something to be proud of. Good luck, and remember if you don't like it do it over again. Have fun Al
  #6  
Old 01-27-2002, 01:33:17 PM
Al Hettich
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Default Re: Replacing Babbit for main bearings

If you think the babbit is going to stick to your shaft/mandrel, soot it up with your acetelene torch. Nothing will stick to that. Al
  #7  
Old 01-27-2002, 02:29:36 PM
Ed Kinch
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Default Re: Replacing Babbit for main bearings

Hi Bob,

If you coat the parts you do not want the babbitt to stick on, with a bar of fels naphtha soap it will release easily. Just take a bar of soap and rub it on until well coated. You can also use the soap to make a tinkers damn that the babbitt can not flow past. If you criss cross a string on your shaft where you want grease or oil to flow it will leave the criss cross grooved pattern in the babbitt bearing.Be very careful there is no water present or the babbitt will spatter.

Ed Kinch
  #8  
Old 01-27-2002, 03:04:17 PM
Kid Dynamo
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Default Re: Replacing Babbit for main bearings

Also- if you have to cast integral thrust flanges in the bearings for crankshaft end play control, more set-up would be needed.
  #9  
Old 01-27-2002, 04:09:20 PM
Jim Tremble
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Default Re: Replacing Babbit for main bearings

QUESTION----

I have never poured bearings or anything except tons of sinkers for fishing. Is it possible to pour through the grease cup holes in the caps and clean them out after the babbit has set up.

I have to repour an engine at a later date and will be watching this thread closely.

Thanks, Jim
  #10  
Old 01-27-2002, 04:23:57 PM
Bob Johnson
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Default Re: Replacing Babbit for main bearings

Hi all Have been getting a world of good help here so now the next question, I will be doing about 2HP engine , does anyone have some Idea of how much Babbit I may require to pour this engine? Thanks all for all your help
 


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