[modeleng] Re: Valve Problem
- From: "Phill Smith" <steam@xxxxxxxxxxxxxxxxxxxxxx>
- To: <modeleng@xxxxxxxxxxxxx>
- Date: Sat, 30 May 2009 21:26:08 +0800
Bede,
The valves and piston rings/seals are the only areas that can cause this
sort of problem.
I hope you find it quickly, and it's an easy fix.
Cheers,
Phill.
----- Original Message -----
From: <bede@xxxxxxx>
To: <modeleng@xxxxxxxxxxxxx>
Sent: Saturday, May 30, 2009 9:07 PM
Subject: [modeleng] Re: Valve Problem
> 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
>>MODEL ENGINEERING DISCUSSION LIST.
>>
>>To UNSUBSCRIBE from this list, send a blank email to,
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>>line.
>>
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