Main bearing

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D.Yoder
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Main bearing

Post by D.Yoder » Sat Nov 23, 2019 10:37 am

Does anyone have the factory specs for the main bearings?
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Steve Jelf
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Re: Main bearing

Post by Steve Jelf » Sat Nov 23, 2019 10:51 am

The inevitable often happens.
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D.Yoder
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Re: Main bearing

Post by D.Yoder » Sat Nov 23, 2019 11:01 am

What I want to know is how thick they are where the bolt goes through.
Are they filed too much?

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CudaMan
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Re: Main bearing

Post by CudaMan » Sat Nov 23, 2019 12:15 pm

My Google search for such a main cap drawing came up blank.

Maybe somebody has an unused, NOS main cap that they can measure?
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Kerry
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Re: Main bearing

Post by Kerry » Sat Nov 23, 2019 4:46 pm

Can't help with what they started out as but checking a couple of dozen, I come up with the thickest at 575 and thin 535.


Kohnke Rebabbitting
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Re: Main bearing

Post by Kohnke Rebabbitting » Sat Nov 23, 2019 7:31 pm

I don't think that information is out there, no need for it other then the Ford Company, and Babbitters, like us.

The caps were all bought from the Ford Co., already poured, as you know.

I think we always used the standard thickness of 9/16, or .562-50, the same as the standard Ball cap hole.

As long as the hole is made round with shims, before the babbitt, shouldn't be any problems.

Herm.

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D.Yoder
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Re: Main bearing

Post by D.Yoder » Sat Nov 23, 2019 7:35 pm

Kerry. That is about where mine run but have some thinner.
My next question. Why do I have more than twice as many center caps?
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Re: Main bearing

Post by Kerry » Sun Nov 24, 2019 1:12 am

Why twice as many centre caps?
Because many a engine rebuild has ended up with a front bearing cap being used in the centre, therefore a surplus amount of centre caps turn up in collections. Which isn't a problem if the babbitting is done the full length to carry the crank jounal and match the block in bearing length.
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Henry K. Lee
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Re: Main bearing

Post by Henry K. Lee » Sun Nov 24, 2019 6:37 am

And like me, things have a habit of breeding on the shelves.

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Re: Main bearing

Post by Allan » Sun Nov 24, 2019 5:51 pm

The front and centre caps are different! I must go and check my stocks. I had never realised that.

Allan from down under.

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