[Public-List] Manifold petcock Atomic 4

[Jim Davis]

Ron

Sounds like you are on track.  The area where this drain is located is the
low point on the manifold and collects almost all the sediment from the
cooling water and engine crud.  Also it is the hottest part of the manifold.
Every time you shut the engine down stuff settles there and solidifies.  For
our fresh water friends this applies to you as well- just not so bad.  If
the manifold were off the engine I would pickle it with Muriatic Acid, but
with the age of the engines I do not recommend pulling the manifold unless
absolutely necessary, the cast iron has gotten soft and you might have
problems retorquing the studs.   Poke out all you can with out damaging
anything, then use a NPT tap to clean the threads as best you can with
minimal force.  Put in a new petcock or plug and use JB Weld where you would
normally use Teflon tape.

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





-----Original Message-----
From: Ronald Walker [mailto:rwpsw at sbcglobal.net] 
Sent: Sunday, May 20, 2012 08:09
To: a30240 at earthlink.net; Alberg 30 Public List -- open to all
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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