[Public-List] Manifold petcock Atomic 4

[crufone at comcast.net]

Ron, 

If you have access to a bench grinder you can easily shorten a regular tap to make your own bottoming tap.  Begin with the regular tap to begin the work. Then grind off a bit and file the end to remove burrs and place in threaded hole and run in. Keep repeating until you have a true bottoming tap to run in at last. Use thread cutting oil and turn in only a quarter turn before backing out and then in slowly again. I wouldn't use j-b Weld. What if you want to replace the petcock in the future? How about Boat-Life caulk? I have used this in low pressure situations and it worked well to seal the leak ............... and can be more easily removed for future service. 

My two cents worth. 

Michael #133 



----- Original Message -----


From: "Ronald Walker" <rwpsw at sbcglobal.net> 
To: a30240 at earthlink.net, "Alberg 30 Public List -- open to all" <public-list at lists.alberg30.org> 
Sent: Sunday, May 20, 2012 8:08:55 AM 
Subject: Re: [Public-List] Manifold petcock Atomic 4 

Thanks Jim 
I did just as you suggested and poked around in the hole and a good bit of crud came out. If I can't find the proper non-tapered tap I will have to revert to Plan "A".J.B.Weld 
Ron #292 

--- On Sat, 5/19/12, Jim Davis <a30240 at earthlink.net> wrote: 

> From: Jim Davis <a30240 at earthlink.net> 
> Subject: [Public-List] Manifold petcock Atomic 4 
> To: public-list at lists.alberg30.org 
> Date: Saturday, May 19, 2012, 9:15 AM 
> You are right about the petcock, it 
> was for draining the manifold.  The 
> manifold is cast iron and the petcock probably brass.  
> While you have the 
> hole open you might want to poke around up inside the hole 
> with a small 
> screwdriver (jewelers) and see how much crud comes 
> out.  As to replugging 
> the hole I would try cleaning the threads as best as 
> possible with the 
> correct size tap the replace the petcock with a new one and 
> use JB Weld on 
> the threads.  Clean both surfaces well with acetone to 
> be sure there is no 
> oil present. Do not over tighten as the cast iron isn't as 
> strong as it was 
> 30 years ago.  Considering how few people open the 
> petcock you could get 
> away with a plug with the same thread. 
> 
> Jim Davis 
> Privateer Isa Lei 
>   
> "This country has come to feel the same when Congress is in 
> session as when 
> the baby gets hold of a hammer." 
> Will Rogers 
> 
> 
> 
> 
> 
> 
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