[modeleng] Re: Rough Running
- From: The Sheppard Residence <peter@xxxxxxxxxxxxxxxxxxx>
- To: modeleng@xxxxxxxxxxxxx
- Date: Sat, 15 Jan 2005 08:18:05 +0000
Hello Terry, Jesse and Allen,
Thanks for the ideas:
Lock up, probably not - it is slide valves and the drain cocks were wide
open.
It ran briefly, then got very stiff, eventually it would only turn the
wheels approximately 90 degrees. (I was more concerned about one of the
safety's not lifting at the time!)
I suspect it's dissimilar materials. As I bought it as a rolling
chassis, I haven't investigated the materials in the pistons and
cylinders yet. That will be tomorrow's job. Off with the end covers!
The fact that it runs fine on air,leads me to think its an expansion
problem. It certainly ran freely enough without any steam in the cylinders.
Fortunately it doesn't need to move for the boiler test!
Cheers
Peter
Terry Lane wrote:
> sure it's ot just a simple hydraulic lock up Pete
>
> sorry - this keyoard's o the way out
>
>
>>Approximately 4 months ago, I tried my Elidir on compressed air and she
>>ran fine.
>>
>>Tonight (for the first time!) she was fired up, apart from one safety
>>refusing to lift, everything was OK, except when we opened the regulator
>>as the whole motion had become extremely stiff! So stiff that it too
>>two of us to move the wheels.
>>
>>Admittedly, we had her on blocks for the steaming, but would that cause
>>such a mechanical lock up?
>>
>>After we had steamed down we put her on her wheels again (no steam
>>pressure) and she moved freely.
>>
>>So, is it being off the suspension that is causing the problem (and if
>>so, why didn't it happen with compressed air) or is the steam causing
>>something to expand (pistons?) causing a lock up, or something else -
>>valve timing?
>>
>>I'm puzzled and would appreciate advice as to what to try first.
>>
>>My gut feel is pistons expanding in the cylinder.
>>
>>Cheers
>>
>>Peter
>>
>>
>>
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