How do I remove the Venturi? The gasket looks like it should go on before the Venturi as it does not go over it very well. Can someone tell me if I am supposed to remove it and if so, how I remove it. I do not want to damage anything. Thanks
Maybe if you submerge it in carburetor cleaner it may loosen it up and flush it with hot water and see. Frenchy
This is a hard job and the venturi is easy to damage... You will need to build a puller. Do NOT Try heat!! Amazingly easy to melt! Start with a washer EXACT biggest size that will fit above the V. This means a washer that is too big to start...low tech reduction can mean hours of filing or putting the thing onto an old screwdriver and letting a grinding wheel spin it...somewhat dangerous, crude, dangerous, fast, and dangerous. Get the washer RIGHT. A little undersize and it will gouge hell out of your venturi. Strengthen the washer with a stack of slightly smaller washers above it. Make a receiving cup to go over the bottom of the V...some sort of pipe cap with a hole drilled in the middle, short piece of pipe and more washers...must be big enough to not hit or jam the V. Drop a long bolt or piece of all thread through...add oiled thrustwashers...tighten. Obviously this stuff can all be done more easily, much better, and more safely if you have acces to a lathe or a friend with such. I have done this on an A with just a quick trip to the harware. Fortunately, i've never had to do it on a B, where the stakes are higher due to rarity of parts and lack of repros of many things. My B's have all come apart easily. Some heat cycling may help...freezer, very low oven, repeat til wife throws you out of the kitchen. Do not go high on heat...I can show you a shiny puddle that was once an A venturi!
Just did one in a small heat treat chamber, but sure an oven will work. Heat ***embly up to 450° F. Remove from the oven and use a small dampen clothe applied to the inside and top of venturi only. Small clothe, cooling the venturi only and at the same time pull turn with the venturi using clothe and your hand protected of course. Do not use a tool you will mar the venturi. Works for me, came right apart. Using a small heat treat chamber it was fast to heat up almost too fast with the fire bricks. Oven should be more forgiving. Use judgment start with short time period. The venturi material has a quick transition from solid to liquid. Let the ***embly & venturi set and cool down of their own accord.
We have been using CONTROLLED heat for years. We bought a cheap electric toaster oven (keeps the brownie baker happy, not using her oven). For zinc alloy, we use a setting of 400 degrees F. (slump temperature is supposed to be about 550 degrees F. but I like a safety margin). Have not melted one yet, and have removed many. Jon.
Be conservative on the temp...oven controls are not necessarily precise, and there isn't even a bad repro of even the standard size venturi for B's, I don't think. I pulled a super-stuck one out of an A...I actually just made a trip to Home Depot and spent about half an hour in the hardware section, examining everything round, strolled to the iron pipe section for a cap and ****** of some sort, and with just a drill I was able to ***emble a crude but successful venturi puller. I have not done a similar search for the B, since all of mine came apart with only a little cursing, including on of the secret "Boss 200.4" 26 MM ones. The only precise fit needed is the washer above the venturi...if it is too small, it will go down the taper and start digging in. Eveything else can be right on or too big and work fine. If you cannot move it by finger or light heating/freezing cycles, you can try again with extra leverage by taping the protruding bit and putting on a hose clamp, which will give you a better grip for twisting. If all of these won't move it, off to the hardware store! Do not be tempted by violence, hammers, and tongs!
Thanks guys! I put that part of the carb in the oven at 400 degrees and got it nice and hot. Then I pulled it out and ran a little cold water over just the venturi. I did need to use channel locks to turn it out, but it did not hurt it and it actually turned out easily.
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