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02-18-2024, 08:07 PM | #1 |
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Join Date: May 2010
Location: Oregon
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Carb Disassembly Tips
I'm about to clean and rebuild several Zenith Model A and B carbs and looking for a better approach to removing the choke and throttle plate screws. This has been previously problematic because repeated efforts to turn out the screws ends in buggered up screw heads and zero movement of the screws.
I have used releasing agents like Kroil and Free-All, mild application of heat, turning the screws in slightly before backing out, as well as increasing levels of profanity, all too often without success. What tips or tricks have worked for you folks? Thanks! |
02-18-2024, 08:39 PM | #2 |
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Location: Western North Carolina
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Re: Carb Disassembly Tips
I am not sure if this would not damage the shafts, but I have used an impact screw driver for stubborn screws. Maybe back up the shaft with a heavy weight.
another option is to drill out the screws, clean up the threads in the shafts, and then buy new screws. https://www.amazon.com/CRAFTSMAN-Imp...s%2C353&sr=8-5
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A is for apple, green as the sky. Step on the gas, for tomorrow I die. Forget the brakes, they really don't work. The clutch always sticks, and starts with a jerk. My car grows red hair, and flies through the air. Driving's a blast, a blast from the past. |
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02-18-2024, 09:44 PM | #3 |
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Re: Carb Disassembly Tips
Use hollow ground screwdrivers that exactly fit the screw slot width and length. They apply a lot of torque without “camming out” of the slot.
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Jim Cannon Former MAFCA Technical Director "Have a Model A day!" |
02-18-2024, 10:38 PM | #4 |
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Re: Carb Disassembly Tips
"Use hollow ground screwdrivers that exactly fit the screw slot width and length".
That’s the ticket.
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Ray Horton, Portland, OR As you go through life, keep your eye on the donut, not the hole. |
02-18-2024, 11:35 PM | #5 |
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Re: Carb Disassembly Tips
Took a few apart today……
Heat the screws first, i have used a handheld solder torch or carefully w/a very small tip with my victor torch set. Use a good screwdriver using as much down pressure as you can muster. If the screw begins to strip -stop & use a thin Dremel cutoff wheel to re establish the slot. Have not had to drill or dissect one since using heat…
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Tim Downtown, Ca |
02-19-2024, 12:50 AM | #6 |
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Re: Carb Disassembly Tips
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02-19-2024, 12:54 AM | #7 |
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Re: Carb Disassembly Tips
Be very careful with the disassembly. A lot of good Zeniths have been destroyed during disassembly. The attached document should guide you through it.
http://www.santaanitaas.org/wp-conte...etor-11-07.pdf Tom Endy |
02-19-2024, 10:56 AM | #8 | |
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Re: Carb Disassembly Tips
Quote:
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02-19-2024, 10:47 PM | #9 |
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Re: Carb Disassembly Tips
Hollow Ground screw drivers are also known as gunsmith’s screwdrivers
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02-20-2024, 11:05 AM | #10 |
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Location: Charlotte, NC
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Re: Carb Disassembly Tips
Urus
I've taken about 25 - 30 carbs apart in the past month and came up with a unique (I think) way to get the jets and screws out. The cap jet's are broken off and are 5m.75 pitch which is small and I heated them in the throat and then took a long piece of wax and melted it around the jet and took a really small easy out 1/8 and gently tapped it in and they screwed right out. I did it on the early GAV's that have the jet at the bottom, now that was a trick because someone had already mess up the screw driver slot, but after a little heat and wax they screwed right out. I put a little heat on the throttle plate and then touched the screws with wax and a screw driver that was a little bigger than the screw and so far everyone has come out. I was shocked and don't know what possessed me to think of it but 85% of the time the part comes loose. Hope this helps |
02-20-2024, 12:49 PM | #11 |
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Re: Carb Disassembly Tips
Bruce, will have to give that a try.
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