Truck carb linkage.

[pflaming]

I have two Carter single barrel downdraft carbs. I think there is a linkage from the lower section to the upper butterfly section. Yet I do not see that in all carbs. Question: Does someone have a good side view picture of the Carter BB carb, single throat for the B1B small block engine? I also notice that auto carbs connect accross the top of engine, while truck connect (to the foot pedal) down the side of the block. I put on a new fuel pump, got the engine to backfire, but the carb now needs atttention. So much detail in getting things correct.

[Merle Coggins]

The "upper butterfly", as you refer to it, is the choke. There should not be any linkage between the throttle linkage and the choke linkage on a truck carb. The truck carbs use a manual choke with dash mounted cable. They also have a "Throttle" cable that can be used as a manual fast idle.

Many of the cars have an automatic choke. These will have a linkage from the choke butterfly to a coil that operates the choke. They may also have a link to a fast idle cam next to the throttle linkage that will raise the idle until the choke opens.

Merle

[pflaming]

Merle, thank you! Now we can proceed. There is a small spring in that choke mechanism, one about 1/2 inch long about the size of a pencil. Is that a hard spring to find; is it critical?

Again, Thank you.

[Merle Coggins]

I dont recall any springs in my choke linkage

[John-T-53]

Is it this one? The spring serves as a shock absorber between the choke cable and butterfly, preventing the cable from being pulled out of the adjusting block. It allows movement in the cable if the choke is all the way closed and the driver is still pulling on it.

[pflaming]

That is the spring. Thankyou for the valuable information. Little things, lots of little things, things not written down in books. Thank you.

[grey beard]

Hey Paul,

If your engihe is still out of the truck, you may want to pay special attention to the accelerator pedal linkage that goes across the back of the block. It goes between the accelerator pedal in the cab to the long link up to the carb on the passangers' side.

This piece is only accessable with either the floor boards out or the engine out of the truck. I know because I had to work on mine. Allan Parkhurst helped me out with parts I needed. Mine was completely worn out and fell apart while I was driving. Had to travel home with only the hand throttle - quite a thrill . . . . . .

[pflaming]

Thank you for the reminder. I recall your post on that problem. Mine is solid. This truck must not have been used hard. Not much of it is worn, just old, rusty, and dirty.

Question: I had a small water leak at first, tightened up the radiation hose and problem solved. Two days later, RUST!. I am wondering what would be the long range effects if I clear coated the entire engine? That would give an 'orginal' look but would not get rusty.

Question #2": Is a gasket required between the 3-speed tranny and the clutch housing? There wasn't one when I removed the tranny?

Got the little spring in the carb, going to try to start this afternoon. Putting a space heater on the manifold / carb for a couple of hours to warm it all up.

PF