These little petcocks are made from unobtainium. They are used in the early Kingstons, some of the Holleys and a few others. Most often the need is for the early Kingston 4 ball with the short inlet -- the one with the inlet half way up the chamber. They are always missing, broken or leak.
They are 1/16 NPT pipe thread. I have never been able to find drain cocks in this size and have wasted all sorts of time trying to get old ones to not leak. So Saturday night I made some.
First photo shows where they fit in the Kingston 4 Ball.
Made some petcocks
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Topic author - Posts: 979
- Joined: Mon Jan 07, 2019 5:42 pm
- First Name: Stan
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Re: Made some petcocks
Answer: I grind the tips on my valve grinder, which is an old Snapon that I have made adapters for the smaller sizes needed for these sizes.
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Re: Made some petcocks
Thank you Stan.
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Re: Made some petcocks
Nice work, Stan.
I have two four-ball carburetors and one is threaded for the 1/16 pipe drain... which I do not have. However, I did found these:
https://www.deboltmachine.com/products/1-16-drain-valve. They are not correct, but I am sure they are functional. I have not ordered one yet as I am still looking, hoping to find an original, and/or keeping my options open. I like yours better.
: ^ )
I have two four-ball carburetors and one is threaded for the 1/16 pipe drain... which I do not have. However, I did found these:
https://www.deboltmachine.com/products/1-16-drain-valve. They are not correct, but I am sure they are functional. I have not ordered one yet as I am still looking, hoping to find an original, and/or keeping my options open. I like yours better.
: ^ )
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Topic author - Posts: 979
- Joined: Mon Jan 07, 2019 5:42 pm
- First Name: Stan
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Re: Made some petcocks
Thanks,
I've seen a couple of those like you show. IMNSHO ( in my not so humble opinion =) ) the problem with them is that they are intended to seal with tapered thread but there is no hex to get a wrench on to tighten with so you are using a pair of pliers to tighten them.
Ah, I checked them out on the website and it looks like they have 7/16 flats to tighten them.
I think they are made for Model Engineer projects in England and they wanted about $25 each plus shipping. Anything tapered thread is expensive.
On the other hand, you can't lose the plug which you could do with the ones I made. With enough time I could make them so the plug would be retained even when loose.
I made some with drain holes on the side and and some with no drain hole. Guess why?? So you can whittle a little wooden plug if you by chance lose the drain plug.
I've seen a couple of those like you show. IMNSHO ( in my not so humble opinion =) ) the problem with them is that they are intended to seal with tapered thread but there is no hex to get a wrench on to tighten with so you are using a pair of pliers to tighten them.
Ah, I checked them out on the website and it looks like they have 7/16 flats to tighten them.
I think they are made for Model Engineer projects in England and they wanted about $25 each plus shipping. Anything tapered thread is expensive.
On the other hand, you can't lose the plug which you could do with the ones I made. With enough time I could make them so the plug would be retained even when loose.
I made some with drain holes on the side and and some with no drain hole. Guess why?? So you can whittle a little wooden plug if you by chance lose the drain plug.
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Re: Made some petcocks
Can't help it: COOL thread! 'Scuse me, wonderful thread.
Bless you all that who see that small! Dang. A valve grinder to taper. Too simple but who would've thought.
Brass get jambed up/embedded in the stone?
I know you could come up with the tooling to retain the plug. Hmmm, perhaps a non threaded portion near the handle and form or punch the body after install... ?
Too bad the drain on an M-3 is 1/8" else I'd be beggin'.
Thank you
Bless you all that who see that small! Dang. A valve grinder to taper. Too simple but who would've thought.
Brass get jambed up/embedded in the stone?
I know you could come up with the tooling to retain the plug. Hmmm, perhaps a non threaded portion near the handle and form or punch the body after install... ?
Too bad the drain on an M-3 is 1/8" else I'd be beggin'.
Thank you
Since I lost my mind mind, I feel more liberated
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Topic author - Posts: 979
- Joined: Mon Jan 07, 2019 5:42 pm
- First Name: Stan
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Re: Made some petcocks
There are lots of ways to retain the plug but I used 1/4 - 32 threads which should tighten up very well and not unwind themselves. It is also easier to whittle a plug if you do lose the turn plug and easier to send out a replacement.
Yes, the brass loads up the stone, even with a big glob of goop and a steady stream of coolant on the contact surface. I have the surfacer for the stone and a couple new stones so it will probably all outlast me.
Back to the shop. Back to the shop. Only 4:30 Saturday. Back to the shop.
Yes, the brass loads up the stone, even with a big glob of goop and a steady stream of coolant on the contact surface. I have the surfacer for the stone and a couple new stones so it will probably all outlast me.
Back to the shop. Back to the shop. Only 4:30 Saturday. Back to the shop.