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oldstuff
Steam Legend!!
Joined: 31 Oct 2006
Posts: 2530
Location: Detroit, Michigan, U.S.A.
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 Posted: Mon Nov 27, 2006 10:48 pm Post subject: MM2 Safety Valve Repair |
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I got this one today... http://cgi.ebay.co.uk/ws/eBayISAP...6satitle%3D220047206420%26fvi%3D1
The safety valve seems to have broke from its threaded end, threaded bush may be ok apart from having threaded end of valve stuck in it. This is a pre-water level plug version. It looks like only one end cap is removeable-the one farthest away from the w/l plug. Not sure how to approach this repair. 
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Twin-cylinder, CSE-3
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Mamodman123
Steam God!
Joined: 19 Jul 2006
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Location: Midlands, UK
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| Posted: Mon Nov 27, 2006 10:52 pm Post subject: |
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The valve looks fine Chuck! its in the thread and in one piece
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Steely
Hero Steamer
Joined: 19 Jul 2006
Posts: 1721
Location: England
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| Posted: Mon Nov 27, 2006 10:53 pm Post subject: |
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How about take the piece of thread thats stuck in the bush out and see if it's Ok. If it is just get a new safety valve. If not you will have to either take the end cap off, or use that solder paste we have been talking about and solder the thread back on from the outside. 
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Griffin
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Joined: 20 Jul 2006
Posts: 2819
Location: Cheshire, UK
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| Posted: Mon Nov 27, 2006 11:02 pm Post subject: |
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If the thread has stuck in the insert you could get it out with an 'easy out'. This is a bit like a threading tap but it has a left handed twist for extracting the old thread.
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oldstuff
Steam Legend!!
Joined: 31 Oct 2006
Posts: 2530
Location: Detroit, Michigan, U.S.A.
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| Posted: Mon Nov 27, 2006 11:12 pm Post subject: |
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| steely wrote: | | How about take the piece of thread thats stuck in the bush out and see if it's Ok. If it is just get a new safety valve. If not you will have to either take the end cap off, or use that solder paste we have been talking about and solder the thread back on from the outside. |
This might work. Even though the valve threaded end is broke from the valve, the stem with spring is still intact and so it wont come out. If I understand you correctly, you're saying heat from outside to desolder the whole thing...then remove threaded bush, re-install, and buy another s/v. Yes?
Just had a thought, I may be able to snip the valve at stem, then I'd have better access to work the stuck threaded part out, with an easy-out, as Griff says. The stem part would fall into the boiler but should be able to fish it out if I can clear the broken thread from the collar. Bummer, was hoping all I had to do was clean this one.
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Mamodman123
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Joined: 19 Jul 2006
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Location: Midlands, UK
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| Posted: Mon Nov 27, 2006 11:14 pm Post subject: |
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The front end comes off MM2 engines! The thread itself should be ok! Ive never had one "go" on a MM2
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oldstuff
Steam Legend!!
Joined: 31 Oct 2006
Posts: 2530
Location: Detroit, Michigan, U.S.A.
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| Posted: Tue Nov 28, 2006 1:09 am Post subject: |
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| Mamodman123 wrote: | | The front end comes off MM2 engines! The thread itself should be ok! Ive never had one "go" on a MM2 |
Yup, threaded collar is fine! I had to pop off the end cap though...
hope it goes on as easy as it came off.
Need Minor 2 safety valve now...
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Twin-cylinder, CSE-3
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Mamodman123
Steam God!
Joined: 19 Jul 2006
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Location: Midlands, UK
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| Posted: Tue Nov 28, 2006 1:10 am Post subject: |
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| oldstuff wrote: | | Mamodman123 wrote: | | The front end comes off MM2 engines! The thread itself should be ok! Ive never had one "go" on a MM2 |
Yup, threaded collar is fine! I had to pop off the end cap though...
hope it goes on as easy as it came off.
Need Minor 2 safety valve now... |
The safety valves are easy to get Chuck! The Cap should pop on easily enough! then just reheat etc
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tmuir
Steam Supreme Being
Joined: 01 Aug 2006
Posts: 14568
Location: Western Australia
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| Posted: Tue Nov 28, 2006 1:18 am Post subject: |
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| oldstuff wrote: | | Mamodman123 wrote: | | The front end comes off MM2 engines! The thread itself should be ok! Ive never had one "go" on a MM2 |
Yup, threaded collar is fine! I had to pop off the end cap though...
hope it goes on as easy as it came off.
Need Minor 2 safety valve now... |
You can buy safety valves from here, his prices are good and he sends internatonally if you cant find them locally
http://forest-classics.co.uk/mamod_spares.htm
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oldstuff
Steam Legend!!
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Location: Detroit, Michigan, U.S.A.
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| Posted: Tue Nov 28, 2006 1:23 am Post subject: |
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Maybe not so easy on this side of the pond...the one from my minor 1 fits...I'll check local hobby store, maybe get lucky.
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Twin-cylinder, CSE-3
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Mamodman123
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| Posted: Tue Nov 28, 2006 1:25 am Post subject: |
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| oldstuff wrote: | | Maybe not so easy on this side of the pond...the one from my minor 1 fits...I'll check local hobby store, maybe get lucky. |
We don't really have hobby stores over here Well ive never seen one anyway
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oldstuff
Steam Legend!!
Joined: 31 Oct 2006
Posts: 2530
Location: Detroit, Michigan, U.S.A.
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| Posted: Tue Nov 28, 2006 2:26 am Post subject: |
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| Mamodman123 wrote: | | oldstuff wrote: | | Maybe not so easy on this side of the pond...the one from my minor 1 fits...I'll check local hobby store, maybe get lucky. |
We don't really have hobby stores over here Well ive never seen one anyway |
Hmm, the one's over here carry plastic model kits, train sets, rolling stock, science kits,
model rockets, etc. Surely you must...
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tmuir
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SPOKESMAN
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| Posted: Tue Nov 28, 2006 4:54 am Post subject: |
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| Mamodman123 wrote: | | oldstuff wrote: | | Maybe not so easy on this side of the pond...the one from my minor 1 fits...I'll check local hobby store, maybe get lucky. |
We don't really have hobby stores over here Well ive never seen one anyway |
Antics chain of stores? |
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SPOKESMAN
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| Posted: Tue Nov 28, 2006 4:54 am Post subject: |
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| Also I should add there are a number of independent shops - 2 or three in Plymouth. |
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