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-   -   Oversize OD main bearings for 37 21 stud block (https://www.fordbarn.com/forum/showthread.php?t=286686)

Yoyodyne 09-05-2020 09:46 AM

Oversize OD main bearings for 37 21 stud block
 

The very last check I made before taking my oh so carefully cleaned tested and prepared 37 block to be bored was to bore gage the mains to be sure I had the correct main caps installed. In the process with the aid of searches here on the Barn I discovered that the main bores are .015" oversize. I understand why, but now I need bearings, or else I have to start the process over with yet another block, this is the 5th block I've cleaned and magnafluxed to get one useable block.


Does anyone here have those bearings for the .015 oversize bores? Or can you direct me to someone who might? My crank is .020 under, but I'd consider any undersize, doing another crank would be faster than finding another block.


I had one knowledgeable Barner tell me that Ford never made a rear main bearing for oversize blocks, is that true? My block has all 3 bores oversize.


I've been pondering how to sleeve the bores to make them work with standard bearings. We have ways, but it seems to be impractical. Anyone ever try it?

Kurt in NJ 09-05-2020 10:51 AM

Re: Oversize OD main bearings for 37 21 stud block
 

I have some oversize in the block rear mains inserts --don't know exact sizes though, can look later today

Bob C 09-05-2020 11:39 AM

Re: Oversize OD main bearings for 37 21 stud block
 

Try Fred at Southside Obsolete. http://www.southsideobsolete.com/Sou...e/Welcome.html

JSeery 09-05-2020 11:49 AM

Re: Oversize OD main bearings for 37 21 stud block
 

Quote:

Originally Posted by Yoyodyne (Post 1927817)
... or else I have to start the process over with yet another block, this is the 5th block I've cleaned and magnafluxed to get one useable block.

Be sure to get the block pressure tested, mag doesn't find all of the possible cracks on a flathead block. Better to find a problem before you sink a lot of money into it.

Yoyodyne 09-05-2020 11:59 AM

Re: Oversize OD main bearings for 37 21 stud block
 

Quote:

Originally Posted by JSeery (Post 1927857)
Be sure to get the block pressure tested, mag doesn't find all of the possible cracks on a flathead block. Better to find a problem before you sink a lot of money into it.

Just finished that with this block. Disassemble, clean, mag, derust, pressure test, etc 5X. I keep finding new ways to find problems.
Where are those new blocks Tod?

cadillac512 09-05-2020 12:36 PM

Re: Oversize OD main bearings for 37 21 stud block
 

McMaster -Carr has shim stock sheets in .007 and .008 thicknesses with a half thou tolerance spec. About 16 bucks a sheet. I'd be tempted to cut some shims and measure the bores with bearing inserts installed. The bearing crush will keep it in place,no problem.



Terry

Yoyodyne 09-05-2020 12:59 PM

Re: Oversize OD main bearings for 37 21 stud block
 

Quote:

Originally Posted by Bob C (Post 1927850)

Is that Barnfind08?

V8COOPMAN 09-05-2020 02:11 PM

Re: Oversize OD main bearings for 37 21 stud block
 

Quote:

Originally Posted by Yoyodyne (Post 1927880)
Is that Barnfind08?

That's him...Fred Wilmer! DD

Phil Gillespie 09-05-2020 02:15 PM

Re: Oversize OD main bearings for 37 21 stud block
 

Quote:

Originally Posted by Yoyodyne (Post 1927880)
Is that Barnfind08?

Yes it is .

Also there is Red at Reds Vintage Spares not to be confused with Reds Headers.
He also stocks some odd sizes. I have just got a plus 30 cam bearing off him.
Good Luck.
Phil NZ

Chuck Kuntz 09-05-2020 02:20 PM

Re: Oversize OD main bearings for 37 21 stud block
 

I have some of those bearings. Need to check for .020
Chuck

Chuck Kuntz 09-05-2020 02:20 PM

Re: Oversize OD main bearings for 37 21 stud block
 

I have some of those bearings. Need to check for .020
Chuck

Yoyodyne 09-05-2020 02:27 PM

Re: Oversize OD main bearings for 37 21 stud block
 

Quote:

Originally Posted by V8COOPMAN (Post 1927904)
That's him...Fred Wilmer! DD

I asked him, he doesn't have them. That's who told me there were no rear mains made for this.

Yoyodyne 09-05-2020 02:27 PM

Re: Oversize OD main bearings for 37 21 stud block
 

Quote:

Originally Posted by Chuck Kuntz (Post 1927909)
I have some of those bearings. Need to check for .020
Chuck

Please! PM sent.

Bob C 09-05-2020 03:48 PM

Re: Oversize OD main bearings for 37 21 stud block
 

Quote:

Originally Posted by Yoyodyne (Post 1927910)
I asked him, he doesn't have them. That's who told me there were no rear mains made for this.


I saw that in the parts book. They show front and center but no rear.
I think it showed .010 and .030 with .015 OS for rear.

Yoyodyne 09-05-2020 04:47 PM

Re: Oversize OD main bearings for 37 21 stud block
 

Quote:

Originally Posted by Bob C (Post 1927928)
I saw that in the parts book. They show front and center but no rear.
I think it showed .010 and .030 with .015 OS for rear.


I see. He wasn't specific, just said Ford didn't make them. I asked for other sizes, got no answer so I took that as no rear bearings of any size made.

Brian 09-05-2020 06:09 PM

Re: Oversize OD main bearings for 37 21 stud block
 

The rear main .015" os in block, .020 on journal is #68-6331 Z However, the length between flanges in block is .010 us. total length thrust to thrust is std. Check the width of your blocks flanges.

Yoyodyne 09-05-2020 07:18 PM

Re: Oversize OD main bearings for 37 21 stud block
 

The block is 2.083" I have a rear cap from a junk block that measures 2.090" Is the 2.090 standard?

Brian 09-05-2020 07:56 PM

Re: Oversize OD main bearings for 37 21 stud block
 

Standard length is 2.095-2.097

Brian 09-05-2020 07:59 PM

Re: Oversize OD main bearings for 37 21 stud block
 

if you can't find .020 bearings, 68 6331 AA is .030 on crankshaft, .015 os and again .010 shorter @ flange

Yoyodyne 09-05-2020 08:18 PM

Re: Oversize OD main bearings for 37 21 stud block
 

Thanks very much for that Brian. Looks like neither length is correct here. The length issues I can deal with, we have ways to machine it and I can even handscrape if necessary. Putting material on is tougher, but a spacer or shim on the length would not be fatal.


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