[Public-List] Manifold petcock Atomic 4

[John Boor]

About 10 yrs ago I replaced all of mt pet cocks on 380 and after
purchasing the proper NPT thread tap I had no problems chasing out the
cast iron block and manifold.

John Boor


> Thanks so much.
> One thing for sure, this isn't going to be an easy fix. I think you're
> right. Have to take my time. Work slowly. The enging is over 50 years old.
> The cast iron is not as stable as it once was. Just have to be careful.
> Got to love it!
> Ron #292
>
> --- On Sun, 5/20/12, crufone at comcast.net <crufone at comcast.net> wrote:
>
>> From: crufone at comcast.net <crufone at comcast.net>
>> Subject: Re: [Public-List] Manifold petcock Atomic 4
>> To: "Alberg 30 Public List -- open to all"
>> <public-list at lists.alberg30.org>
>> Date: Sunday, May 20, 2012, 6:58 PM
>>
>>
>> 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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