Accelerator Rod

[Stuart F.]

Re: Accelerator Rod

Tim;

What I don't understand is why I have slightly different adjustments from one AFB to another, i.e. 3461S vs. 3731SB. They seem to measure the same from center of primary throttle shaft to center of throttle rod hole. But there are subtle differences because I can not use the same number of idle screw turns to get the same idle speed, same goes for the two mixture screws. It can't all be the idle tube jets, can it? (.035" vs. .037").

I've found out a number of other unique characteristics of the 3461S I'll share with you in a PM soon.

Stu Fox

[Wayne P.]

Re: Accelerator Rod

May I add another question about the accelerator rod. The one on my car was shortened. I ordered another one . The thread length is not the same. Was the original threaded most of the way down the shaft ?
Thanks for all the info.

[John D.]

Re: Accelerator Rod

May I add another question about the accelerator rod. The one on my car was shortened. I ordered another one . The thread length is not the same. Was the original threaded most of the way down the shaft ?
Thanks for all the info.

Wayne, Can't give you a measurement but no the original thread was not all way down on the shaft.

Story: GM made a one that fits all accelerator rod. It was a couple of feet long and 3/4 of it was threaded. Had a 90 degree end. So you bought it and bent it to shape and cut it off. End result was no cigar. John

[Michael H.]

Re: Accelerator Rod

Michael -

My '67 has the dark plated swivel with two circumferential grooves. The rod and swivel threads are 1/4"-36.

Thanks John. The swivel on my 66 is the older style, zincad with no grooves. I wonder if 67 was the first year for the new black one with two grooves?

The part number in the 66 AIM is 3758592.

[David L.]

Re: Accelerator Rod

Pictured on the left is the original 3758592 swivel from my 1966 Corvette. It measures 1.08" O.L. with 1/4"-36 threads.
The 0.43" dia. section measures 0.50" long and the 0.25" dia. section measures 0.58" long.

The NOS swivel on the right side is GM # 3711199 used on 55-62 Corvettes 8 cyl. w/P.G. as per my 1963 Chev. parts catalog.
It has a black coating. I bought a package of 5 in the 1980's from my local Chevrolet dealer.
O.L. = 0.90", 0.50" @ 0.43" dia. and 0.40" @ 0.25" dia.

I do not have a 3892880 swivel that was used on the 1967 Corvette.

Dave

[Michael H.]

Re: Accelerator Rod

Pictured on the left is the original 3758592 swivel from my 1966 Corvette. It measures 1.08" O.L. with 1/4"-36 threads.
The 0.43" dia. section measures 0.50" long and the 0.25" dia. section measures 0.58" long.

The NOS swivel on the right side is GM # 3711199 used on 55-62 Corvettes 8 cyl. w/P.G. as per my 1963 Chev. parts catalog.
It has a black coating. I bought a package of 5 in the 1980's from my local Chevrolet dealer.
O.L. = 0.90", 0.50" @ 0.43" dia. and 0.40" @ 0.25" dia.

I do not have a 3892880 swivel that was used on the 1967 Corvette.

Dave

Thanks... The 3758592 is exactly what I would expect to see on 63 through at least 65 and likely all of 66 too. Zincad instead of black and no grooves.

I was hoping that someone would posted a picture of the 3892880 swivel used for 67.

[David L.]

Re: Accelerator Rod

Thanks... The 3758592 is exactly what I would expect to see on 63 through at least 65 and likely all of 66 too. Zincad instead of black and no grooves.

I was hoping that someone would posted a picture of the 3892880 swivel used for 67.

Michael,

My 3758592 swivels DOES have a single groove on the 0.43" dia. section about 0.04" from top end as shown in the photo. You can just barely see it in the photo. I have another 3758592 swivel from a 1966 Chevrolet 283 in a box somewhere in my garage. I will check to see if there is a single groove on it.

Dave

[Joe L.]

Re: Accelerator Rod

Thanks... The 3758592 is exactly what I would expect to see on 63 through at least 65 and likely all of 66 too. Zincad instead of black and no grooves.

I was hoping that someone would posted a picture of the 3892880 swivel used for 67.

Michael-----


The GM #3758592 was discontinued from SERVICE in April, 1967 and replaced by the GM #3892880. The latter was discontinued several years ago.

I have several of the 3892880. If I can find them, I'll post a photo later.

[Joe L.]

Re: Accelerator Rod

Pictured on the left is the original 3758592 swivel from my 1966 Corvette. It measures 1.08" O.L. with 1/4"-36 threads.
The 0.43" dia. section measures 0.50" long and the 0.25" dia. section measures 0.58" long.

The NOS swivel on the right side is GM # 3711199 used on 55-62 Corvettes 8 cyl. w/P.G. as per my 1963 Chev. parts catalog.
It has a black coating. I bought a package of 5 in the 1980's from my local Chevrolet dealer.
O.L. = 0.90", 0.50" @ 0.43" dia. and 0.40" @ 0.25" dia.

I do not have a 3892880 swivel that was used on the 1967 Corvette.

Dave

Dave-----


The GM #3711199 remains available from GM to this very day. So, here we have a part originally released about 1956 that's still available in SERVICE 55 years later!

[Michael H.]

Re: Accelerator Rod

Michael,

My 3758592 swivels DOES have a single groove on the 0.43" dia. section about 0.04" from top end as shown in the photo. You can just barely see it in the photo. I have another 3758592 swivel from a 1966 Chevrolet 283 in a box somewhere in my garage. I will check to see if there is a single groove on it.

Dave

I missed the single groove. Guess I should just admit that I need reading glasses.

The groove in yours isn't typical of the location of two grooves seen on the 67 swivel.

[Michael H.]

Re: Accelerator Rod

Michael-----


The GM #3758592 was discontinued from SERVICE in April, 1967 and replaced by the GM #3892880. The latter was discontinued several years ago.

I have several of the 3892880. If I can find them, I'll post a photo later.

Thanks Joe. I know I ordered several of these decades ago but I have no idea where they are or if I still have them.

I wonder if the 67 AIM shows a mid production change from the 3758592 to the 3892880? The 880 almost sounds like a late 66 (model year) part number, numerically.

[Joe L.]

Re: Accelerator Rod

Thanks Joe. I know I ordered several of these decades ago but I have no idea where they are or if I still have them.

I wonder if the 67 AIM shows a mid production change from the 3758592 to the 3892880? The 880 almost sounds like a late 66 (model year) part number, numerically.

Michael------


Yes, GM #3892880 does imply a late 1966-released part number and, yes, the 1967 AIM does indicate a change in the part number of the swivel from 3758592 to the 3892880. The date of the change is 11-14-66, so the 3758592 was likely used for the first 3 or 4 months of 1967 production.

[Michael H.]

Re: Accelerator Rod

Michael------


Yes, GM #3892880 does imply a late 1966-released part number and, yes, the 1967 AIM does indicate a change in the part number of the swivel from 3758592 to the 3892880. The date of the change is 11-14-66, so the 3758592 was likely used for the first 3 or 4 months of 1967 production.

Thanks Joe.

[David L.]

Re: Accelerator Rod

My 1966 Chev. 283 swivel (GM # 3758592) is identical to my 1966 Corvette swivel with the single groove. In the same box I found a package of 2 NOS 3892880 swivels that were used on the 1967 Corvette. They each measure 1.08" in O.L. with the 0.42" dia. section measuring about 0.44" in length and the 0.25" dia. section measuring 0.64" in length. These dimensions are slightly different when compared to the 3758592 swivel.

The 3892880 swivels also have 2 grooves spaced about 0.12" apart in the center of the 0.42" dia. section and the coating is black (photo below).

Dave

[David L.]

Re: Accelerator Rod

I missed the single groove. Guess I should just admit that I need reading glasses.

The groove in yours isn't typical of the location of two grooves seen on the 67 swivel.

I just posted a photo of a pair of NOS 3892880 swivels.

Dave