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Pouring main bearings for an IHC M 1 1/2 hp


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  #1  
Old 02-08-2005, 09:11:48 PM
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Default Pouring main bearings for an IHC M 1 1/2 hp

Has anyone poured babbit main bearings for an IHC M 1 1/2? I know that you can purchace the inserts, but I have the babbitt and equipment, so thought I'd try it. I'd be interested in photos of a jig set up for pouring bearings on this engine though. I haven't quite envisioned on how to pour them and end up with the "thrust lip" on the bearing. Thanks for any photos, or suggestions.
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Old 02-09-2005, 08:37:49 PM
J.B. Castagnos J.B. Castagnos is offline
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Default Re: Pouring main bearings for an IHC M 1 1/2 hp

I have some jigs for pouring rod bearings with thrust flanges on them. I take two pieces of flat bar, 1/4x2" worked for me. Tack them together to form a square, clamp in a 4 jaw chuck, bore a hole through the center to fit the crank. Machine a recess to form the flange area out from the crank hole. Remove the plates and break them apart. Get a shaft 1" longer than the width of the main bearing area. Machine it to fit the main bore. Machine the 1/2" extra on each side to the dimension of the crankshaft. Clamp this pin in the block with the main cap. Take the saddle plates you made and clamp one on each side of the main, saddled up against crank sized area of the pin, seal with a little rtv silicone. Remove the main cap and pin, drop in a piece of shaft the same size as the crank and pour your bearing, repeat for the cap. I know this isn't a thousand words but one picture would help, if you don't understand my explanation I could try setting it up and taking a picture.
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Old 02-09-2005, 11:56:11 PM
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Default Re: Pouring main bearings for an IHC M 1 1/2 hp

J. B., Thanks for your reply. I'm not sure if I understand, or can visualize your whole proceedure, but I'm printing it off, and taking it to be to read a few times........ maybe I'll have a dream about making the jig..... if not that, I hope it's about a green eyed blonde! Thanks, Tom
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Old 02-11-2005, 10:33:14 PM
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Default Re: Pouring main bearings for an IHC M 1 1/2 hp

Well.... I geuss I would just pour up a couple cored slugs and machine them in the lathe then saw them in half to make the top and bottom. Would save a lot of set up and damming... I have poured up blanks for things like this by setting a short shaft inside a short piece of pipe. But do something to allow for shrinkage or the babbit will get a real Grip on the shaft
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Old 02-12-2005, 12:08:03 PM
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Default Re: Pouring main bearings for an IHC M 1 1/2 hp

Ken, Good idea, but am wondering how you get, and keep
the shaft centered inside of the pipe while your pouring
the babbitt?
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Old 02-12-2005, 12:20:49 PM
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Default Re: Pouring main bearings for an IHC M 1 1/2 hp

Well you can turn a blank to cap bottom of pipe. Then drill a hole in the middle, and use a screw to secure the shaft. And taper the shaft so it will just pop right out.

Cheers! NICK
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Old 02-12-2005, 02:29:14 PM
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Default Re: Pouring main bearings for an IHC M 1 1/2 hp

Quote:
Originally Posted by Tomfg
Ken, Good idea, but am wondering how you get, and keep
the shaft centered inside of the pipe while your pouring
the babbitt?
Well centering isn't really that critical as your going to turn the OD and bore it anyway. You can do as Nick says or sometimes I have just drilled a hole in a board and stuck the shaft in there and set the pipe over it. Be sure to have the bottom halfway sealed or Mr Babbit will leave...
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Old 02-12-2005, 02:48:06 PM
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Default Re: Pouring main bearings for an IHC M 1 1/2 hp

Be sure to pre-heat too as even the moisture in wood will cause an eruption.


Cheers! NICK
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Old 02-12-2005, 06:04:58 PM
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Default Re: Pouring main bearings for an IHC M 1 1/2 hp

Lots of good ideas. Thanks! I like the idea of making the bearing inserts using a pipe and shaft, rather than messing with the bearing housing, and doing lots of damming up. Have a couple of questions regarding the turning, and boring of the babbitt core after it's poured.
1. How much undersize should I have the shaft, so I can end up with an accurate bore?
2. Can the boring be accomplished in a lathe with a boring bar?
I have an old 6" Craftsman lathe with a boring bar that mounts in the tool post, put haven't had much practice with "boring" yet. Tried to bore the inside of the pipe I'm going to use for this babbitt job, just to clean up the inside some, and smooth it out, but it wasn't cutting well at all.... time to dig a book out on boring bar set-up!
Thanks again for you great ideas!
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Old 02-12-2005, 06:51:10 PM
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Default Re: Pouring main bearings for an IHC M 1 1/2 hp

Yes.... The boring can easily be done in the lathe. The Babbit will cut like Butter unlike the pipe you tried to bore. Those smaller lathes may have a problem cutting hard material as they are not real Rigid.

When I made new wrist pin bushings (Bronze) for my 24 - 45 Rumely I didn't have a long enough boring bar so I just welded a tool bit to a steel shaft which I mounted in the tool holder. Worked very well and I have used that tool for many things since.
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