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.
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.
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?
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.
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.
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.