extraction of broken Venturi

Brubaker

Brubaker

Well-known member
By using heat, how difficult is it to get a broken Venturi out? Best(fastest) to go straight for an extraction tool? Thanks
 

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You can easily burn out both sections with a torch. The material melts quite easily. Be sure to wear eye protection as the material sizzles and pops.

If you are going to be doing a lot of Zeniths you might want to consider making an extracion tool

Tom Endy
 

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Or, carefully peck it out. Once you tap a chunk out the rest will fall out. However, use a very small pick or drift and tap, tap, tap. Too much force and you can break the cast iron.
 
I did it a couple of times as follow with a Heat torch and melted the out, no damage to the carb body .
 
As others have said, use enough heat to melt the venturi, it's beyond repair anyway so it doesn't matter if it's in one piece or not. By just heating the carb up without melting the venturi will not loosen it. The material that the venturi is made of expands a greater amount per unit of heat than the carb body, so it will become tighter in the bore because it will expand out against the body. Or you could use an extractor if you have one. Or you could carefuly cut the inside of the venturi with a hacksaw in about 2 or 3 places and then pick out the pieces.
 
Don't really know what you guys are experiencing -- mine fell out when I turned the carb over.:D
 
i just soaked mine in muratic acid for a few hours,or what ever it takes to dissolve it
,then soaked it in baking soda and water for a day or so
the acid ate it right out
 
I went the hacksaw route. That puppy was in there good but once I got it cut almost through I used a small punch to free it from the walls. The slice was just enough to get the separation process going. I went slow towards the end of the cut so I wouldn't dig into the wall of the carb. Good luck
 
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Here is the excellent tool that Don Turley made to a remove broken venturi.
Hi Tom,
Attached to this email are photos of the very simple tool that I made to remove a broken venturi from the bottom half of a Zenith Model A carburetor.

The body of the tool is a piece of 1-1/2" inside diameter pipe or tubing x 1-3/4" long. The ends of this piece of pipe are faced so that they are square to the axis of the pipe. On top of the piece of pipe is a piece of 1-3/4" diameter steel bar, 1/2" thick with a 17/32" hole drilled in the center. This piece is welded to the top of the pipe.

The puller plate is 1/2" thick with a 1/2" NF thread in the center. The large diameter is 1.182". The small diameter is 3/4". Shoulder is 1/4" thick.

The bolt is 1/2" NF x 3-1/2" long. If you can not easily obtain a NF bolt, then I guess a NC one would work, but just make sure the thread in the puller plate matches the bolt.

You have permission to post or publish the photos and details, if you so wish. If you do, please credit the source as Don Turley. Thanks.

With the exception of my cell phone number, you can find all of my contact information on my web site, www.donturley.com
 
A torch is the best way to just melt out the old venturi; wear eye protection as the pot metal has air bubbles and will pop and splatter. The heat doesn't due any damage to the cast iron housings. Muriatic acid can damage the jet threads and must be nuteralized immediately; not the best way to clean up a carburetor.

Ron
 
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