Just to introduce myself Modelworks 9F restauration project.

[peterdebeus]

Good afternoon,

I have a question for the experts around here,

After i have run the engine on the rolling road, i have discovered that there is a load of steam leaking out when i open the regulator, and it looks like its not passing by the valve but behind the brass bushing that is pressed into the cilinder block.
Also i am not really sure about the valves if they seal like they should and if the timing will be ok.
The ports that feed the cilinders are also really small so i think there is not much steam going towards the cilinders.

Dous anyone know an expert company or simular where i can send my cylinder blocks and valves to get them inspected and probably make new valves or machine things to the right dimensions?

Hope someone can help.

Peter

[Cro]

Peter,

Drop me a personal message and we'll chat, I have had the same issue's on my 9f.

Adam

[cplmickey]

Adam, Peter, I've got the same issue with steam bypassing too. Can I join in the discussion please (but after I come back from holiday in a couple of weeks. Thanks, Ian.

[Cro]

I've sent you both a message

Adam

[dem132]

I'm interested to learn how to overcome this issue? As I believe my Black Five may have the same issue, when I finish replacing the boiler.

[ejparrott]

I've asked Peter to pop a few photo's on, I'm not too sure what he's referring to

[Cro]

Essentially modelwroks and winson didn't make the liners to a good enough tolerance so they are a slide in fit in the bores and they expected loctite to take up the gap and seal them in place - no no no! They also used a strange brass that expands at an extrodinary rate so if you used solid bobbins they then jam up - damn! lastly becasue the tolerances were cra the liners never lined up concentrically and the bobbin would be offset either end SO!

You need to remake the liners again, as far as I am aware, or it was in my case, dimensionally they are correct for the ports and so on but they just need to be made and fitted better. Simples!

Adam

[flyingfox]

Greetings to you all, I understand that it is possible to machine a grove to take a O ring in the back of the liner, and seal them that way.
I was lucky, mine sealed OK.
regards
brian

[peterdebeus]

Yes thats exactly the problem... bad fitting liners.... now need to fin someone who could solve this...

[peterdebeus]

First I need to find out how to get them out pfff....

[peterdebeus]

Heated the cilinder blocks, then pushed the liners out... now at the machine shop to make 3 grooves to fit o rings! Hopefully that helps.

[Roger]

Oct 13, 2015 18:01:46 GMT peterdebeus said:

Heated the cilinder blocks, then pushed the liners out... now at the machine shop to make 3 grooves to fit o rings! Hopefully that helps.

If the 'O' rings have to pass over any ports, you'll need them to be as large cross section as possible else they will get sheared off like mine did. I ended up also making a little insert to fit into the exhaust port to help compress them as they went past.

[cplmickey]

I think I need a little help understanding this O-ring solution. If the liners are a sliding fit in the bores (we are saying there's a gap that Loctite can't fill) and we fit O-rings to seal the gap between the liner and the bore, aren't the liners then effectively floating on O-rings and so able to move a little. If so then isn't there the possibility of the 2 halves not being perfectly aligned albeit only a thou or two, but then the possibility of problems with the valve rings snagging on the joint?

[Cro]

Oct 13, 2015 21:29:25 GMT cplmickey said:

I think I need a little help understanding this O-ring solution. If the liners are a sliding fit in the bores (we are saying there's a gap that Loctite can't fill) and we fit O-rings to seal the gap between the liner and the bore, aren't the liners then effectively floating on O-rings and so able to move a little. If so then isn't there the possibility of the 2 halves not being perfectly aligned albeit only a thou or two, but then the possibility of problems with the valve rings snagging on the joint?

This is how I saw it when I did mine so decided to redo mine from scratch so that they were a good hand press fit sealed and fixed with loctite, no issues since

[Bluff Chuffer]

I acquired a Winson 9F No. 030, in May 2014, and have rebuilt it, making many mods as I saw fit, as well as from reading about the adventures of others. No. 030 has been running since April this year and I am very pleased with it. There are still things to improve, but it has been a good runner on various tracks here in South Africa. I did strip the chassis to its basic non moving parts stage, and rebuilt up from there. The list is long! I can enumerate in more detail if required. I kept it as much a Winson kit as I could, changing only that which had to be changed. I am busy compiling a Youtube video of it running at various tracks.

I wish you every encouragement in your efforts - you won't be disappointed with the loco if its correctly re-worked.

[ejparrott]

I've been chatting to Peter about this over the last few weeks, the Winsons manufacturing is shocking to say the least. There is a variance of size between the liners and the block of size-for-size to a couple of thou clearance. The halves could be lying anywhere anyway!

[peterdebeus]

I will see how this works out, for now its the only option I have, and can do myself, if I need someone to re make the liners its going to cost me a lot... ill tty this, if it doesn't work, I can think of making new parts in the mean time its still play time with the big ones, last few weekends....