[Public-List] Manifold petcock Atomic 4

[Glennb]

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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