<VV> (no subject)

[shortle]

Bob, I also have never heard this version before. The closest I came to hearing this was in your book regarding "the thumpers". I will digress more on this before saying anything else. And I hope to see you and Lon in a couple of weeks in Palm Springs. And Matt.
Timothy Shortle in Durango Colorado 81301


-----Original Message-----
>From: Mark Durham <62vair at gmail.com>
>Sent: Oct 7, 2013 3:25 PM
>To: "BobHelt at aol.com" <BobHelt at aol.com>
>Cc: Virtual Vairs <virtualvairs at corvair.org>
>Subject: Re: <VV> (no subject)
>
>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
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