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Old 02-10-2021, 06:39 PM   #21
johnneilson
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Default Re: Pics for your review/ comment.

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Originally Posted by Kurt in NJ View Post
those oil grooves curving around the front thrust surface are factory, they are cast in when the bearing was poured, I have both finished and unfinished NOS caps showing that detail
Kurt,

to your point, the grooving done in your picture is correct.
This will not cause rear seal leakage.

Have not seen one for a while, John
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Old 02-10-2021, 11:05 PM   #22
CWPASADENA
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Default Re: Pics for your review/ comment.

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those oil grooves curving around the front thrust surface are factory, they are cast in when the bearing was poured, I have both finished and unfinished NOS caps showing that detail
I just was looking at the how they cut the oil groves. I know the Model A blocks originally did not have the oil groves extending all the way onto the thrust surface which I always thought was to keep oil from running out the rear main. May be by the time they made the diamond block they were able to get away with it and still have the rear main leak under control. It appears that this would give better lubrication of the rear thrust surface.

I have a Diamond "B" block in the shop that is all apart, I will have to look at the groves in the rear main.

Chris W.
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Old 02-11-2021, 12:43 AM   #23
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Default Re: Pics for your review/ comment.

Maybe my eyes are trick'n again but those grooves don't appear to go all the way to the back of the bearing.
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Old 02-11-2021, 02:33 AM   #24
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Default Re: Pics for your review/ comment.

Back in the earl '50s, my Dad bought a '31 AA that had only 10K original miles. The vehicle spent most of the time parked all those 20 years. Inspection of the crank showed that the mains were OK, but the rods needed to be spruced up. He did all this with the engine in the vehicle. To "polish" the rod journals, he used Crokus cloth wrapped around the journals and spun the crank while holding the cloth tightly to the journals. At only 9 years old, I had the job of pressing the starter switch while my Dad tended to the under vehicle duties. One of the great times I had with my Dad working on cars, and probably the driving force behind why I ow a Model A today.
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Old 02-14-2021, 02:06 AM   #25
hardtimes
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Default Re: Pics for your review/ comment.

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Originally Posted by Kurt in NJ View Post
those oil grooves curving around the front thrust surface are factory, they are cast in when the bearing was poured, I have both finished and unfinished NOS caps showing that detail
Hey Kurt ,
Thanks for the pic and info !
That is duplicate od what I’m looking at.
So, in your opinion, this is an original...to this engine... bearing ?
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Old 02-14-2021, 09:20 AM   #26
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I would try just polishing the crank journal with some extra fine emory cloth and oil. Then mike the journal diameter and consider bearing inserts rather than rebabbit. They used babbitt only because they didn't have inserts back then, if my memory is correct. Then again, you can use babbitt to compensate for an undersize journal if needed.
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