Can we talk about JB Weld?

[speeder]

Originally Posted by Bob Kontak

JB Weld
There are several spots on the case where an original bonding/sealing agent was placed. These are the places where a factory dowel pin or plug has been inserted into the case. JB Weld is an excellent heavy-duty epoxy that can be used to replace the dabs of factory epoxy that help seal some of these areas of the case and chain housings.

https://www.pelicanparts.com/cgi-bin/wizards/Parts_Wizard.cgi?command=step3&wizard_root=911_engine_rebuild

Thanks. Makes sense in that context. MotorSheister used it to repair cases that had exit holes in them from thrown rods, etc. And sold them to people w no disclosure.

[speeder]

So in the photo I posted of the carburetor, (motorcycle carb, fwiw), what product or method of repair would you guys use?

[Zeke]

Originally Posted by speeder

So in the photo I posted of the carburetor, (motorcycle carb, fwiw), what product or method of repair would you guys use?

You can do the epoxy and monitor it. If it starts to fail for some reason it's not that difficult to reverse the process and have it welded.

[1990C4S]

Originally Posted by speeder

JB Weld? For what situation(s)?

Covering plugs in the case.

Originally Posted by speeder

So in the photo I posted of the carburetor, (motorcycle carb, fwiw), what product or method of repair would you guys use?

I would be very comfortable with JB Weld. I just used it to seal the bottom of a lawnmower bowl. Zero issues.

[dad911]

Is a replacement expensive or un-obtainable?

[Geneman]

devcon 10760.....what dan said.... i have heard peter dawe patch engine block holes with this stuff in a pinch. in my race gear box he fashioned a novel oil entryway for cooling and tap/died it for a high pressure AN fitting. the stuff is unbelievable.

[Bob Kontak]

Originally Posted by speeder

So in the photo I posted of the carburetor, (motorcycle carb, fwiw), what product or method of repair would you guys use?

I'm not sure what you want to do. Is there a part that fell off you want to reattach?

Do you just want to plug the hole? If so, what is the tube's function?

It's not an assembly that I am familiar with.

[speeder]

Originally Posted by dad911

Is a replacement expensive or un-obtainable?

Yes and kind of yes. Used carbs that will work are available but mostly in awful condition or really expensive. Also, my carbs have an unusual and beautiful satin finish from the factory that the earlier ones don’t have. I haven’t found similar carbs or carb bodies in my type for any price.

Originally Posted by Bob Kontak

I'm not sure what you want to do. Is there a part that fell off you want to reattach?

Do you just want to plug the hole? If so, what is the tube's function?

It's not an assembly that I am familiar with.

The hole stays, in fact it would need to be re-drilled after welding or epoxy. The damage is the missing metal chunked off around the hole.

[Shaun @ Tru6]

Originally Posted by speeder

Thanks, I’ll pick one up. I don’t have a compressor here but I have one at home in CA. I’m thinking now that I’ll just repair it w a hand file, really carefully. Here is what I picked up today and the damage:

Can you shape a washer to curve around that tube and then drill to hole size spec? Wave washers are thin and might work, already curved though easy to flatten and recurve. Or McMaster Carr has a huge selection of shims that might work in filling and resizing that hole.

[flipper35]

I think a washer would disrupt the airflow too much in that particular case. I would just JB and be done.

[speeder]

Originally Posted by flipper35

I think a washer would disrupt the airflow too much in that particular case. I would just JB and be done.

Yes, the damage pictured is on a concave surface that would need to be welded or epoxied and then milled down to original contour. A washer would not work.

[Shaun @ Tru6]

That's too bad. I use .1mm (4 thousandths) on up McMC shims when putting Guard LSDs in 915s. Thought that kind of shim thickness might work and be a stronger more permanent repair than JB Weld alone.

[Zeke]

Is there a brass tube that fits in the hole or is that the orifice for a metering needle? I ask because it would be good to understand what forces are given to that hole. Or, how in the world did that break like that?

It very much looks like a slide valve motorcycle carb.

Edit: Sorry, I just saw that you said it was a MC carb in post #42. So, it is the needle hole. Weird break.

[speeder]

Originally Posted by Zeke

Is there a brass tube that fits in the hole or is that the orifice for a metering needle? I ask because it would be good to understand what forces are given to that hole. Or, how in the world did that break like that?

It very much looks like a slide valve motorcycle carb.

Edit: Sorry, I just saw that you said it was a MC carb in post #42. So, it is the needle hole. Weird break.

They broke because some idiot installed the little atomizers in the holes incorrectly, (backwards), and the larger end pushed right through the soft aluminum when I...err...he tightened them down.

I’ll post pictures tomorrow of the offending parts and it will all make sense.

[Bill Douglas]

Denis that was really bad luck the previous owner put a hole in it.

I think it's a very good candidate for JB Weld or one of these greater alternatives.