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Help with FC connecting rod part numbers?
Posted by: SteveInMarietta ()
Date: October 15, 2017 03:40AM

Can anyone help identify the original part numbers for the FC steering connecting rod (goes from the Pitman arm to Boomerang arm)? I'm trying to determine the individual part numbers for the forward and rear rods GM P & A catalogs (such as shown below), and I think I see numbers for the full assembly (e.g. 3772027) and the longer forward rod (e.g. 3782920), but I do not see the shorter rear rod listed. Also, was the two rod plus adjusting sleeve assembly replaced in 64 & 65 with a single rod with ball sockets on both ends?

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Re: Help with FC connecting rod part numbers?
Date: October 15, 2017 06:50AM

Steve,
Here is P&A 30C (9/1971) diagram on the layout and group guide numbers



The adjusting sleeve is 3854805 for all Corvair applications in group 6.232
The long and short "end assembly" for all is group 6.233 F.C. Short: 3826596 long: 3827117
Note that the 6.233 end assembly group is the same for both the relay rod and the tie rod sections in view A & B
Don't know about a single unit Relay rod for later F.C. but I'd suspect not.
I'd ask Craig Nichol - he was a 33rd degree Parts guru in a past segment of life.




Dan Davis ~ Pierce County, WA ~ CORSA Western Director + Corvairs NW + North Cascades Corvairs + Corvanatics
1966 Corsa Turbo coupe ~ ~ 1966 140 Corsa ~ ~ 1965 Monza 140/4 'Vert Sierra Tan/Fawn ~ 1964 Monza 'Vert (SOLD) ~ 1960 Monza Ermine White/Red PG ++ ~ 1965 Monza 140/4 Evening Orchid w/ ivory/black interior ~ 1962 Monza Wagon 102/4 ~ 1963 Rampside/Scamper ~ 1963 Red/Greenbrier ~ 1969 Ultra Van #468

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Re: Help with FC connecting rod part numbers?
Posted by: SteveInMarietta ()
Date: October 17, 2017 06:31PM

The steering connecting rod part numbers are
short rod end=3757564
long rod end=3782920

My confusion seems to have come for the mysterious descriptions of the rod ends in section 8.70, which gives the length of 3757564 as 13 7/16" beginning ~1965 (as shown in my first post above). Furthermore, subsequent P & A catalogs refer to the two rod ends as "First" and "second" designs (see below). The length of 3757564 is only correctly stated a 3 7/16" in earlier P & A catalogs (I found it correct in 61 - 63 catalogs).

Assuming my interpretation is correct, is this really just confusion on the part of the compiler of these P & A catalogs carried forward year after year?
Steve

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Re: Help with FC connecting rod part numbers?
Posted by: Pedigo ()
Date: October 17, 2017 07:12PM

My guess is a simple typo,Steve.

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Re: Help with FC connecting rod part numbers?
Posted by: SteveInMarietta ()
Date: October 18, 2017 12:30PM

It looks like it started as a typo whereby "(3 7/16" became "13 7/16".

But it seems that someone later made the arbitrary decision that 3782920 @13 3/4 must be the "1st design" and 3757564 @ 13 7/16 must be the "2nd design", which was perpetuated forward.

. . . and like the beat of a butterfly's wings, this small error may be the actual root cause of the demise of our beloved Corvair!
Steve

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Re: Help with FC connecting rod part numbers?
Posted by: junkman ()
Date: October 18, 2017 06:54PM

The parts books are full of errors. Who in their right mind, would have put an exhaust part into the carburation group? They did that with one pipe that is part of the turbo on the Spyder. It is no wonder that the guys behind the counter at the dealerships were usually grumpy. I worked at a Chevrolet dealership parts department one summer while in college. You couldn't make ups some of the mistakes that came into the parts orders. Order a part that cost 35 cents, and they would send a $75 part with the wrong part number on it. The part number was what we ordered, but the part was wrong. The parts manager would keep the part, and say to order another. It was 50/50 if you got the correct part, or the same wrong part. It is called human error for a reason!!

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Re: Help with FC connecting rod part numbers?
Posted by: ROD ()
Date: October 18, 2017 07:40PM

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Re: Help with FC connecting rod part numbers?
Posted by: SteveInMarietta ()
Date: October 29, 2017 06:09AM

I finally completed an illustration showing the original GM and NORS (Moog & TRW) part numbers for the FC steering linkage. Granted, the original GM part numbers may not be of much use any more, but at least it sorts out a lot of confusion in the P & A catalogs. You can find the diagram with the other exploded views on the Corvanatics Manuals web page.
Steve

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