Re: Allan in NE-carb photo

Posted by Allan in NE on November 25, 2004 at 05:11:03 from (148.78.243.24):

In Reply to: Allan in NE-carb photo posted by Paul Shuler on November 24, 2004 at 22:04:18:

Mornin' Paul,

That carburetor is Edlebrock's remake of the old Carter AFB.

Now, maybe it is just the picture or maybe I just can't make it out, but it appears that you have some external linkage missing. This is a good thing; makes for an easy fix!

I've marked the pump plunger with a green arrow and this is the little guy that is dealin' you fits.

As the throttle shaft is rotated, that pump plunger has to move down in it's bore to give a 'squirt' of fuel at the nozzles, which are located in the primary bores just under the choke flap.

I've also marked the power valve assemblies in red. This type never gives any trouble unless you have to lift that lid off to replace the accelerator pump plunger. In this case, you need to remove these two assemblies as a first step and replace them last.

They consist of two delicate little metering rods, which are threaded down into the main metering jets. They are each attached to a little piston, which works with engine vacuum against a little spring. If you have to take 'em out, don't loose that little spring inside the piston (looks like the spring out of a ball point pen).

Vacuum holds the piston down (against it's spring) and the metering rod down into the main jet. When under acceleration, the engine vacuum drops and the spring pressure forces the piston up, pulling that metering rod out of the main jet and allowing more fuel to flow thru it.

But like I say, this just looks like trouble over with the pump plunger and that missing external linkage. Find that missing actuator rod and I think your problems are over.

If the linkage is in fact there and the actuator cam is indeed rotating with the movement of the throttle shaft, then the pump plunger has to be replaced. (Hollar back on this, as there is a little test to see if the check balls are all in place)

Sure hope this helps,

Allan

Follow Ups:

• Re: Allan in NE-carb photo Paul Shuler 14:41:28 11/26/04 (0)
• Re: Allan in NE-carb photo Ron in Nebr 08:57:30 11/25/04 (0)
• Re: Allan in NE-carb photo Paul Shuler 08:22:33 11/25/04 (0)
• Re: Allan in NE-carb photo Paul Shuler 08:10:00 11/25/04 (0)

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