Carb ID & Troubleshoot

[Nick1966]

Hello,
I'm not sure what the ID for the carb I have is. I know it one of the carbs that is labeled Motorcraft but is made by Holley. It's a single barrel. That about sums up the ID part.

Recently i've been having trouble getting the car to run right. So I "rebuilt" the carb. I put that in quotes because i'm not a mechanic and am pretty sure I screwed it up. I had a mechanic friend of mine from work come take a look at it and he seems to think I am missing a part. I don't know the proper names for the pieces it supposed to be connecting so I took a picture. He says it supposed to connect point A to point B. Any additional information you can offer on this would be greatly appreciated. Thank you in advance.

Nick

 

[bubba22349]

can you take a picture back a little bit to see the carbs top too?

 

[Nick1966]

Here are all the pictures I took during the "Carb Rebuild" from a few weeks ago:

http://www.facebook.com/media/set/?set= ... 956&type=3

 

[bubba22349]

Looks complete to me. To answer your question before there would be no other rods connecting A to B. B is choke pull off and A is the fast idle cam and linkage. Do you have the choke cover installed right and set to spec?

 

[Frankenstang]

Hmmm...I believe B is actually the accel pump and A is the fast idle cam/choke unloader. Not real familiar with the Holley 1940, but I know some others here run 'em...hopefully they'll chime in. I think the odd rod on the opposite side of the carb may be WOT power valve type setup...but this is where my recollection gets hazy

EDIT: bubba2249 might have transposed his letters, or I just did Good luck

 

[bubba22349]

Hmmm...I believe B is actually the accel pump and A is the fast idle cam/choke unloader. Not real familiar with the Holley 1940, but I know some others here run 'em...hopefully they'll chime in.

The accelerator pump is internal on the Holley 1940's, follow the rod linkage on choke side and through the top of the carbs cover it connects to the Accel pump

 

[Frankenstang]

Hmmm...I believe B is actually the accel pump and A is the fast idle cam/choke unloader. Not real familiar with the Holley 1940, but I know some others here run 'em...hopefully they'll chime in.

The accelerator pump is internal on the Holley 1940's, follow the rod linkage on choke side and through the top of the carbs cover it connects to the Accel pump

My bad...thanks bubba

This might help...
http://c777913.r13.cf2.rackcdn.com/holl ... manual.pdf
EDIT: From this site...'Mike's Carburetor Parts'
http://carburetor-blog.com/?page_id=335/

 

[Nick1966]

What is a Choke Cover and where is it located?

1940 Holley Carb, exploded view
http://imageshack.us/photo/my-images/18 ... 3.jpg/sr=1]

 

[Nick1966]

This might help...
http://c777913.r13.cf2.rackcdn.com/holl ... manual.pdf
EDIT: From this site...'Mike's Carburetor Parts'
http://carburetor-blog.com/?page_id=335/

Didn't notice that the first time, Thanks!!

 

[Nick1966]

Ok I spoke with Larry (mechanic friend who took a loot at it with me the other day) he said that it's running too lean. That when the choke flap is nearly closed it runs strong but when the flap is open it sputters, backfires and chokes out. Whatever is supposed to open and close the choke is not working correctly. Thats why he had suggested that it may have a missing connector rod (which we have established it does not)

So, what makes the choke open and close? Thats seems to be the piece in question... Suggestions?

 

[bubba22349]

The choke closes and opens by spring pressure working with temperature change (hot air) drwn into the choke housing, the stove pipe is hooked up right? Hot air reacting on the bimetallic spring in the choke housing causes the chokes butterfly to open is that happening when it warms up? When the choke is closed the fast idle cam and linkage is supposed to be set so that the engine is running at a higher RPM spec. If it is doing all those thing correctly than the choes is working as it should. The manual that Frankenstang posted is very detailed and will have all the details of the choke settings to make it work right. However if the choke is working and when its warmed up its off and your

"still getting sputters, backfires and chokes out"

than there is a completely different problem. Start by varying the float level is set correctly also did you clean all the internal passages with carb cleaner during the rebuild? Also check to make sure the throttle shaft dose not have excessive wear. Good luck

 

[Nick1966]

Thanks Bubba I will consult the manual and check all the things you have suggested and get back to you!