[modeleng] Re: Valve Problem
- From: <bede@xxxxxxx>
- To: "modeleng@xxxxxxxxxxxxx" <modeleng@xxxxxxxxxxxxx>
- Date: Sat, 30 May 2009 09:07:28 -0400
Thanks all for your responses on this.
I put the engine up on blocks and got the boiler up to working pressure
on air. When I open the reg, the air whooshes out the blast pipe, BUT,
the wheels do spin feebly about 10 or 15 revs before the pressure dies.
So maybe the valves are seating and it's something else? Or one valve
is unseated and the other is doing the work? or could this be piston
ring issues? That would be more incremental it seems, and this problem
occurred all at once.
Any further thoughts as to what to look for as I begin to strip the loco
down?
Thanks as always,
Bede
On 5/26/2009, "bede@xxxxxxx" <bede@xxxxxxx> wrote:
>Hi All,
>
>Looking for help troubleshooting my Martin Evans' "Conway", 3.5"
>gauge narrow gauge 0-4-0.
>
>Tried to steam the loco over the weekend and it raised steam ok to
>working pressure (80psi), but when I opened the regulator/throttle, the
>steam just whooshed directly up the blast pipe, no power to the
>cylinders at all in either direction, tried pushing the loco back and
>forth, but no luck.
>
>I have to admit that I did an idiot thing- the smokebox was full of
>cinders and ash and my steaming buddy and I took the lazy way out and
>tipped the whole engine upright to dump the debris out. I'm thinking
>now that this somehow caused one or both valves to become unseated which
>resulted in the steam just going straight out the exhaust port. This
>loco has outside cylinders with the steam chests inside the frames,
>Stephenson gear with the slide/D valves vertical against the port faces.
> But I can't imagine the valves coming away that easily, esp. as
>they're vertical...
>
>Any suggestions on what steps to take to remedy this, I really hope I
>don't have to strip the loco down...
>
>Thanks,
>Bede in breezy Brooklyn
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