Fusing Aluminum to Bronze

[Doms]

I have a carb off of a Yamaha Grizzly 600 that I need to repair. The float bowl over flow tube (1/8” brass) broke off of the float bowl (aluminum) when it was accidentally dropped. I would like repair it but I’m not sure how to go about sealing it. I thought about taping the float bowl and threading the brass overflow into that with the aid of some petrotape (a Teflon tape that will stand up to petrochemicals).. I’ve also found a solder that it supposed to work with brass/aluminum but I don’t want to buy a pile of it for a one time repair. Do you guys have any other ideas?

*Title is supposed to say brass.. brain fart.

 

[Milton Shaw]

Most of the time those tube are just pressed into the housing. I would try pulling it out with a sheet metal or dry wall screw. If it is brass into aluminum then that has to be pressed in and not threaded.

 

[LXCam]

I certainly wouldn’t use any type of teflon tape in a carb. All it’d take to make your life miserable would be one tiny piece coming off and clogging the idle circuit or whatever. If you don’t have the means to correct a mechanical fit I’d use a rated adhesive such as this.

https://m.autozone.com/sealants-glu...ube-gas-and-oil-resistant-adhesive/417319_0_0

Or search loctites site for the appropriate product (that’d be my first choice)

 

[kelpaso1]

You're likely going to need a new float bowl. If that brass tube broke off flush to where it is pressed into the bowl and you manage to get that piece out and press the remaining tube back into the bowl, the tube will be too short and will leak out the over flow tube.

 

[Doms]

I actually found a pretty good thread outlining exactly what I need to do in this scenario.

https://cx500forum.com/forum/genera...l-overflow-tube-raplacement.html#/topics/7662

I have all the tools he used so I’ll pick up some brass today and give it a go. I was worried that a press fit wouldn’t seal but it looks like that’s all it is. I’ll update with how this turns out.

 

[bugman53]

A warning, Alot of the carbs have a high zinc content to the aluminum, It melts at a lower temperature than other alloys of aluminum. I have tried the aluminum solder and ended up melting the carb. It can be done but it is real easy to melt the carb. Probably best to make a new one and press it in.

 

[bonneyman]

A warning, Alot of the carbs have a high zinc content to the aluminum, It melts at a lower temperature than other alloys of aluminum. I have tried the aluminum solder and ended up melting the carb. It can be done but it is real easy to melt the carb. Probably best to make a new one and press it in.

Why do you think that is? Zinc is more resistant to chemical additives in gas than aluminum?

 

[bugman53]

I do not know, My guess would be it is easier to die cast cast than an aluminum like A356. I just read that zinc alloys are less prone to porosity than aluminum that could have something to do with it. I would bet they are a Zamak alloy But i do not know for sure which alloy.