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Autoline carb C-907 #1311460 Wed May 22 2019 01:10 AM
Joined: Apr 2019
Posts: 122
J
JD1 Offline OP
Shop Shark
I have a 51 chevy 3100 that is new to me. I am trying to get the carb setup properly.
The motor is a 235 and has an autoline carb C-907 on it.

I have a few questions.
The throttle cable just hooked under the throttle linkage and looks a little odd. Is that how it is supposed to be hooked up?
The choke butterfly sticks wide open at the top of the adjustment. If I nudge the butterfly, the choke cable works as expected. There is a spring on the choke linkage, that doesn't seem to be doing anything.
Does anyone has a picture of a working carb linkage and throttle and choke cables hooked up or an original diagram?

Once I know how it's supposed to work, I can adjust it so I don't have to manually do it on each start.

Thanks,
JD

Attached Files
IMG_5020.JPG (227.35 KB, 170 downloads)
IMG_5022.JPG (189.06 KB, 168 downloads)

1951 Chevy 3100 1/2 ton (1957 235, 4 speed, 411 rear)
Re: Autoline carb C-907 [Re: JD1] #1311462 Wed May 22 2019 01:23 AM
Joined: Nov 2005
Posts: 5,484
3
3B Offline
Master Gabster
Hy JD1, it's hard to tell from the pictures, but I don't think the choke cam is installed correctly on the choke shaft. Is there a screw holding the choke cam to the choke shaft? If there is a screw, try removing it and see if you can turn the cam over and reinstall it so the piece with the spring tries to keep the choke open. Hope that helps.

Re: Autoline carb C-907 [Re: JD1] #1311473 Wed May 22 2019 02:59 AM
Joined: Apr 2019
Posts: 122
J
JD1 Offline OP
Shop Shark
I'll check for the screw tomorrow. I'll get a better picture of the choke linkage as well.
Thanks for the suggestion.


1951 Chevy 3100 1/2 ton (1957 235, 4 speed, 411 rear)
Re: Autoline carb C-907 [Re: JD1] #1311475 Wed May 22 2019 03:05 AM
Joined: Mar 2014
Posts: 1,065
J
Jon G Offline
Shop Shark
I had one of these set up correctly but sold it. If you can show a side image (showing the choke cam) I can tell you if it is correctly set.


Jon

1952 1/2 ton with 1959 235
T5 with 3.07 rear end
Re: Autoline carb C-907 [Re: Jon G] #1311579 Thu May 23 2019 02:06 AM
Joined: Apr 2019
Posts: 122
J
JD1 Offline OP
Shop Shark
Originally Posted by Jon G
I had one of these set up correctly but sold it. If you can show a side image (showing the choke cam) I can tell you if it is correctly set.

Here is a side view of the choke. I pulled the choke cable tight and it's better, but the choke sticks wide open. If I want the choke to engage, I have to take off the air cleaner and nudge it down 1/8" (then the cable works fine).

The throttle cable is just bent under the linkage, that can't be right can it?

Attached Files
IMG_5030.JPG (164.11 KB, 121 downloads)
Last edited by JD1; Thu May 23 2019 02:08 AM.

1951 Chevy 3100 1/2 ton (1957 235, 4 speed, 411 rear)
Re: Autoline carb C-907 [Re: JD1] #1311688 Thu May 23 2019 08:34 PM
Joined: Aug 2015
Posts: 15
Y
YCgoat Offline
New Guy
JD1, I put a cable stop installed below the throttle linkage; mine was bent around the linkage when I got it.

Re: Autoline carb C-907 [Re: YCgoat] #1311722 Fri May 24 2019 12:55 AM
Joined: Apr 2019
Posts: 122
J
JD1 Offline OP
Shop Shark
Can you post a link or pic of that stop?


1951 Chevy 3100 1/2 ton (1957 235, 4 speed, 411 rear)
Re: Autoline carb C-907 [Re: JD1] #1311849 Fri May 24 2019 11:15 PM
Joined: Jul 2000
Posts: 638
G
Gord&Fran Offline
Shop Shark
That's a Rochester Model B carb. You need to know that when it's time to get a rebuild kit. Also lots of info on the 'net about the Rochester including some YouTube videos.

If you have the factory assembly manual, you can see how the throttle and choke cables are connected - see section 6, sheet 5.01. If you don't have the manual, you should get one. Amazon and parts suppliers have them e.g. https://www.amazon.com/1947-1954-Chevrolet-Factory-Assembly-Manual/dp/B00BGB7FXC

Step on the gas pedal and pull the choke knob out. The cable will turn the fast idle cam. The choke should close as there is a spring which makes the fast idle cam and choke move together. You can poke the choke plate with your finger and it should open and spring back afterwards.

Since you have to close the choke with your finger, either the spring is broken or not installed properly or there is something else hindering the smooth movement of the choke.


Gord
----
1954 1/2 ton 235 4 speed
Re: Autoline carb C-907 [Re: Gord&Fran] #1312030 Sun May 26 2019 10:41 PM
Joined: Apr 2019
Posts: 122
J
JD1 Offline OP
Shop Shark
Thanks Gord, your comments helped. I ordered the assembly manual last week, and it just arrived yesterday.
I do have a couple questions about that diagram.
The screw 121749 listed on that page. Does that screw into the accelerator lever rod? The accelerator rod has a hole for the throttle cable, but not for a screw. Or is that a cable stop like YCGoat stated above?

I think the spring on the choke itself is broken. I see the one end of the choke spring but where does the other side rest against.

Thanks again for the help.


1951 Chevy 3100 1/2 ton (1957 235, 4 speed, 411 rear)
Re: Autoline carb C-907 [Re: JD1] #1312044 Mon May 27 2019 01:33 AM
Joined: Jul 2000
Posts: 638
G
Gord&Fran Offline
Shop Shark
Here's what the spring should look like (and where you can get a new one if needed): https://www.carburetor-parts.com/Rochester-B-Fast-Idle-Lever-Spring_p_1124.html

If the spring is not broken, you have to wind it so it closes the choke.

The screw goes into the cable stop. The throttle cable slips thru the accelerator rod so you can press the gas pedal and override the throttle setting. BTW, I don't have the throttle cable. Don't see any good reason to have it.


Gord
----
1954 1/2 ton 235 4 speed
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