Cap and Comp Jet Helicoil repair

[TinCup]

Originally Posted by CT Jack

Take the jets to a plating shop and have a copper or nickel flash put on the fittings. This will easily add .0002" to the surface of the threads. Make sure you put wax in the orifice of the fitting otherwise it will get plugged.

That was my next thought.

[Russ/40]

If the goal is a good fitting jet, i would tin the threads of the jet carefully with 50/50 solder.
Just don't tighten it too much.

[TinCup]

Originally Posted by Russ/40

If the goal is a good fitting jet, i would tin the threads of the jet carefully with 50/50 solder.
Just don't tighten it too much.

The Challenge was the threads in the bowl were all but gone.

[redmodelt]

I read that 3 times and still miss read it. Sorry about that. Even if you were to install a hel-coil you would still need to drill/tap oversize to install. What about soldering it in place? About the only time it would need to come out again would be full rebuilt.

[Russ/40]

Originally Posted by TinCup

The Challenge was the threads in the bowl were all but gone.

I suggested tinning the jet threads, because I can't imagine getting in there to repair what is left. You wouldn't need much for threads to hold the jet if it's tinned.

[F.M.]

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Originally Posted by TinCup

Both of these are 5mm 75 pitch threads. Checked local auto parts and no luck there. Trying to repair Zenith 3 bottom that I found in a box at an antique store. All I can find is M5 .08.

Ok, Try Brattons, Its in his parts book.. Just as you want..

[redmodelt]

Where is it listed? I looked on line and didn't see any Heli-coils listed only the tap under carburetors. Or is it just in the printed catalog? Do you have a parts number? We too have a couple of bottoms that could use some work, but not as rare as a Z3 so have not been in any rush to fix.

Thanks

[F.M.]

Originally Posted by redmodelt

Where is it listed? I looked on line and didn't see any Heli-coils listed only the tap under carburetors. Or is it just in the printed catalog? Do you have a parts number? We too have a couple of bottoms that could use some work, but not as rare as a Z3 so have not been in any rush to fix.

Thanks

Did not notice he wanted a Heli-Coil, Thought he wanted a Tap..

[redmodelt]

Bummer, would have been easier fix then some of the suggestions so far.

Re my suggestion about soldering it in; if that jet is screwed in without the gasket it can interfere with the well going all the way down. So a spacer under it might be needed.