Carburetor question

Jiles · Mar 21, 2018

I have done mechanic work for over fifty years. I specialized in carburetion, automatic transmission and air conditioner.
I have rebuilt many hundreds of carburetors and there is one thing that always puzzled me.
I have replaced worn throttle shafts on aluminum bodied carbs and the brass shaft would be worn out and the carb holes would be virtually same as new with no noticeable wear.
I guess the aluminum is better lubricated then the brass shafts with [i:50d878f532]gasoline? ?[/i:50d878f532]

steve_in_mo · Mar 21, 2018

The aluminum is a relatively hard alloy.
The brass is soft. It's easier to replace
a shaft than a carburetor body.

Bob M · Mar 21, 2018

Carburetor throttle bodies are usually cast from a "hard" aluminum alloy like A390 or similar. This alloy is harder than the soft brass typically used for throttle shafts. Thus a brass throttle shaft will wear faster than the aluminum throttle bore it runs in.

Gene Davis (Ga.) · Mar 21, 2018

Costs less to replace the shaft than the carburetor body also.

JF in MI · Mar 22, 2018

I would not have thought about it had you not mentioned it but now thinking about it I can't remember ever seeing a brass shaft. All I can remember is steel.

Carburetor question

Jiles

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steve_in_mo

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Bob M

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Gene Davis (Ga.)

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JF in MI

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