[Public-List] Manifold petcock Atomic 4

[John Boor]

Since it is a drain port you don't need a bottoming tap.

John Boor

> If you can find a bottoming tap of the correct size, it has far less
> taper than the normal tapered tap. You might want to compare it with a
> plug tap to see which might suit you best. I imagine you will have to go
> to an industrial supplier who carries an open line of tools to find them.
> Don #528
>
> On 5/19/2012 8:27 AM, Ronald Walker wrote:
>> The engine is the old Atomic-4.Its my understanding that all Albergs
>> were originally powered by them.I believe the petcock is brass and the
>> manifold is some type of steel. As I said the threads are there, just
>> flattened out. I'm going to try some J.B.Weld. Don't know what else to
>> do.
>>
>> --- On Sat, 5/19/12, Glennb<brooks.glenn at comcast.net>  wrote:
>>
>>> From: Glennb<brooks.glenn 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: Saturday, May 19, 2012, 1:18 AM
>>> What kind of engine/manifold do you
>>> have, and what material is the petcock made of?  sounds
>>> like the petcock corroded off, leaving part of the threaded
>>> portion in the manifold.
>>>
>>> If so, try going in with a very small drill bit, maybe
>>> slightly larger than the ID of the hole, then run a series
>>> of increasingly larger taps to ream out the old material to
>>> match the original ID and thread.
>>>
>>> just did this on my steam engine, took about an hour to
>>> replace the broken nipple. But it was brass and the boiler
>>> is steel.
>>>
>>> Glenn p
>>> dolce 318
>>>
>>>
>>> Sent from my iPad
>>>
>>> On May 18, 2012, at 12:47 PM, Ronald Walker<rwpsw at sbcglobal.net>
>>> wrote:
>>>
>>>> Maybe someone can help me with a small problem I
>>> discovered during the spring start-up procedure.On the aft
>>> part of the manifold there is a petcock. Its is for draining
>>> the manifold water jacket. As I began to close the petcock I
>>> noticed it was loose. I tried to tighten it but it ended up
>>> falling off in my hand. After a good close look I saw that
>>> the threads were all buggered up.On the petcock as well as
>>> the hole. I thought about running a tap in to maybe sweeten
>>> up the threads but the recess is way to shallow. Any advise
>>> would be appreciated.
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