Quadrajet Problem Solving > Diagnose a Quadrajet carburetor problem

Installed Bottom Plug Kit- now massive vacuum leak

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Cliff Ruggles:
Can't see it all coming but I'll modify the instructions to include a test fit for protrusion before you glue them in place.

Once in a while you'll run into that issue.  I just use a cut off wheel on my die grinder and take a little off the plugs so they don't bottom out against the baseplate and effect sealing of the gasket.

Then I'll apply the Marine Tex and install the plugs. 

Not really a big deal to file or grind them down a tad if you end up too high.

I get carbs in here all the time freshly rebuilt with a big glob of JB Weld on them holding the baseplate away from the main casting.  Even if they don't leak the pressure applied can cause the secondaries to stick or not fully close each time. 

I love JB Weld, doesn't work for chit to seal up leaky bottom plugs and has made me a lot of money over the years pealing it off and doing a better repair in that area.......Cliff

Stripes:
After I cut the plugs flush and ensured it fit flush, I have a huge vacuum leak.
Any idea how warped it can be and the gasket not seal it? I broke, bent, or screwed up something in this process, as it leaks bad now....

Cliff Ruggles:
If the plugs aren't sticking up the main casting and baseplate should easily seal on the gasket. 

It's would be pretty difficult to tighten the screws hard enough to warp one of those baseplates without cracking it first......Cliff

Stripes:
I finally figured my carb issue out. I re-assembled the carb with the longest power piston spring, and didn't realize it was there to be cut to length. I removed the long spring and put the stock power piston spring back in, it runs very well now.

The kits come with 4 springs, and the book really only instructs to use the strongest spring possible to still have the rods down at idle. I never saw one spring was provided to be cut to length, so I selected the wrong spring. Carb idles well, seems great.

tayto:
i believe the black spring should be used for stock or near stock applications

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