Stuck Butterfly

[AHa]

I had high hopes for this carburetor but the throttle valve is stuck. So far I have boiled it in water (15 min.), frozen it, heated it with a torch, set it behind the windshield to be heated up, lightly tapped on it, and boiled it in kerosene off and on for two days. I also rigged up a makeshift sonic cleaner and vibrated it and used every type of penetrant known to man, all to no avail. Anybody got any tricks up their sleeve? I have not bead blasted it, which I have found sometimes frees rusted parts. All help appreciated.

[Terry Bond]

I'll bet the pot metal has swollen seizing the shaft. Perhaps one o\f our carb experts can chime in on a possible solution.

Terry

[AHa]

I don't know if it matters but this is not a pot metal carb; it is cast aluminum. As I understand it, aluminum carbs were available from all the major suppliers for race cars. This is a Stromburg.

[carbking]

I do not remember an aluminum or brass one that I could not free using heat.

 

Jon

[AHa]

Jack,

 

Thanks for your sage advice. I don't know the application of the OE 1 but as I understand it, the aluminum bodied carbs were made by order for race cars. I will try your solution.

[Dandy Dave]

Submerge it in Lacquer thinner for a few days. Use a vessel that you can cover so that the thinner does not evaporate.  

[carbking]

A carburetor is a classic example of a Galvanic cell. Two dissimilar metals in the presence of a liquid. Ions flow. The there is probably corrosion molecules between the throttle shaft and the throttle body.

 

Because of the expansion differences of dissimilar metals, heat works best.

 

Jon