Zenith secondary well jet-How to remove???

Fred K-OR

Fred K-OR

Well-known member
I have an old Zenith carb that I am trying to rebuild but am having problems with the secondary well jet. The problem is that the threads look kind of rusty above it and it will not move with the screwdriver. I did try the heat from a propane torch and the cold water but it has not moved.

Any other ideas? Or can I drill this out and not mess up the threads to much? Thanks for ideas.
 
these are either easy and turn right out or tough and need drilled. Someone may know of an easier way, but I have tried easy outs, they wont work, i set up in my drill press and drill most material out, then work out the remainder. When drilling keep in mind not to drill thru the bottom of the carb body.
 
As Steve says I too have found that it's either easy or very hard. I would try soaking in Kroil or equivalent penetrating fluid and just be patient. Drilling is sometimes required and best done in a press. Use the depth gauge or tape on the bit to make sure you don't go to deep. Good Luck!
 
Fred, before you drill it out and take a chance of messing up the Threads. Try heating it again a little longer, then quench with Penetrating Oil w/straw in Nozzle. If that don't work, heat & water again. Some times it takes 2 or 3 times before it will finally give up. I use Mapp Gas, which is hotter than Propane, but then you need to buy a Mapp Torch, which is a good small $ investment for the next job where you will need extra Heat.
 
I have started using Evaporust on carbs...removes the rust, absolutely does not attack anything else including the venturi if it's stuck too. It has some limited penetrating power, and so helps a bit on stuck threads and throttle shafts. It will at least give you a flying start on attacking the thing.
 
Thanks guys. Will try again with the heat. May use my welding torch next time to get a little more heat.
 
I once broke a lower Zenith housing in half trying to remove a secondary well with a spiral ease out and adjustable wrench. After watching the video carburetors and carbohydrates I can take any Zenith apart, no matter how rusty. A propane torch won't get it hot enough. I use an acetelene torch and heat the housing dark cherry red in the affected area and drop it in a bucket of water.
 
I am a big fan of this product.

Bruce Lancaster said:
I have started using Evaporust on carbs...removes the rust, absolutely does not attack anything else including the venturi if it's stuck too. It has some limited penetrating power, and so helps a bit on stuck threads and throttle shafts. It will at least give you a flying start on attacking the thing.
Click to expand...
 
1st I bead blast the threads so there is no more rust and junk in the way. Then I use my rose bud tip on my oxy acte torch heating the casting just short of red and dunk in water, then I spray it with any light oil, and normally it turns right out.
 
I have yet to run across one I could not get out with heat and cold water. You want to heat it really good around the whole area of the secondary well. I use a welding torch and get it so the casting glows red, then I quickly submerge it into a pail of cold water. It usually just unscrews then.

Tom Endy
 
Steve Wastler said:
these are either easy and turn right out or tough and need drilled. Someone may know of an easier way, but I have tried easy outs, they wont work, i set up in my drill press and drill most material out, then work out the remainder. When drilling keep in mind not to drill thru the bottom of the carb body.
Click to expand...

Steve do you happen to remember what size drill you used?
 
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