<VV> (no subject)

[Mark Durham]

Thanks, Bob, I had heard that before but it was too hard to dig it out of
the catacombs, it came back when I started reading your comments. As I said
before, I saw no adverse wear anywhere on the bearings or the old 145
crankshaft. I'm really busy at the moment. I'm one of those furloughed
government workers and my honey do list is large! Fall is approaching
unusually fast this year, and I have tons of stuff to do before it gets
cold, not to mention removing the front suspension and gas tank from my 62
to do the front of the car this winter!!
Regards
Mark Durham


On Mon, Oct 7, 2013 at 3:29 PM, <BobHelt at aol.com> wrote:

> **
> Hi Mark,
> Apparently you are not aware of the story, so here is a reasonable repeat
> of what happened.
>
> In About April 1962, the Tonawanda engine assembly plant discovered that
> their bearing supplier had supplied some #1 main bearings with "mis-matched
> flange" thicknesses. So production engineering studied the situation and
> found that those bearing couldn't be used as is, BUT production had to
> continue. So they issued a Tech Bulletin stating that only one half of the
> flanged bearing would be used and the other half would be the same as the
> #2 and #3 main bearings. Thus, production continued until the supplier
> could supply the correct #1 bearings.This correction happened toward the
> end of 1962.
>
> But unfortunately, this problem and the solution got announced to the
> bearing industry manufacturers and suppliers. So the bearing industry
> started manufacturing replacement bearings with this combination of half
> flanged #1. The whole industry converted. And they NEVER went back to the
> original configuration. But Chevrolet DID. So there are STILL many main #1s
> being made and sold with the half-flange.
>
> The good news is that the half-flange works perfectly well. It just looks
> strange.
>
> HTH
> Regards,
> Bob Helt
>
>
>
>
>  I fully intend to check the clearances using
> full flanged bearings.
> Brian, that is all you can do. Maybe some blocks were machined differently
> for some reason and they did the half flange to prevent it from being too
> tight. Do check for that, my engine was at the inner limit with two flanged
> halves in there.
>
>


-- 
Mark Durham
Hauser, Idaho
62 Monza coupe Red/Red 4 speed