Mine is an early roarer burner so a bit more pipework and more bends, I was going to soak it for a bit in liquid carb cleaner then have a go with pipe cleaners from both ends. I think that's about as much as I can do unless anyone has any more wisdom. I like the idea of heating it up but I don't think mine is in bad enough condition to warrant that.
Hi @noise_boy Here is a thread discussing cleaning of burners: https://classiccampstoves.com/threads/ultrasonic-cleaning-of-stove-burners.27409/ Best Regards, Kerophile.
Thanks @kerophile that's all good info. My new nrv tool arrived yesterday, however it does not seem to fit the nrv. The nrv is in good condition, I can see it's not rounded but it seems bigger than the end of the tool. The tool fits my jet perfectly though. I asked the seller and they said the nrv and jet are the same size and the tool should fit both, and that my nrv I probably rounded off. But it isn't. Could my valve be non standard? It looks the same shape as the jet and tool but looks bigger!
I've never heard of the jet nipple being the same size as the NRV! Sounds like the seller is unaware of the item they are selling - it sounds like a silent jet/nipple tool as here https://fettlebox.co.uk/nipple-jet-key-for-silent-burners.html (or if it has an articulated end it sounds like https://fettlebox.co.uk/nipple-jet-key-for-roarer-burners.html)
I think the seller makes them, he also makes new valves so you would hope he knows what he is doing! It's Juliands on eBay, sure folks here must know of him.
Hi, this link tells you about NRV operation, and how to make your own removal tool. https://classiccampstoves.com/threads/non-return-valves.6860/#post-64230 If you enter NRV or NRV problems as a search term in the “search” box at the top RHS of this screen you will many links. Best Regards, Kerophile.
Yes, I have bought an NRV tool from Juliands but I found it too big not too small! Certainly it was far bigger than the jet.... Both tools do look quite similar - could it have been a picking error?
Thanks @kerophile I had read that but was holding off making my own as I only have access to fairly basic tools and my metal work experience is strictly limited! I thought I'd try buying one first, looks like I might have to make one after all as basecamp are all out of the cheaper tools and I don't want to pay £30 for a posh one! @Macaroon, I thought it might be a picking error but he said they only do one size as the jet and nrv are the same... So initially I'd like to know if the jet and nrv are in fact the same size, if so then I've got a very non standard NRV in my stove!
@noise_boy I was in the same position as you, not really having the materials and experience for making my own hence I bought a kit from Juliands, I think it was this one: https://www.tilleylampsandstoves.com/product-page/primus-stove-keys-wrench-parts in which you will see the NRV tool is distinctly different - much larger - than the 2 nipple tools (one of which is for the roarer and one of which is for the silent burner). In the pictures, you will also see that the replacement NRV in the kit is larger than the nipple, which is normal. My personal experience is that the NRV tool is a little too large for the NRVs on my stoves but it does work fine as long as the NRV is not stuck. Does this help?
The nrv and the niple should be the same size. All my nrvs has the same size that the nipples of all my Optimus 111 and 8R, Svea 123R and Radius 43. A nrv-key is the easy way to remove the jet from a 111T, and the opposite end of the regulator key of later 111T and 111C was made as nrv- and jet removetool. I just checked a random spare nrv, it was a perfect fit in the nipple hole of the regulator key for Svea 123R.
So.... after a bit of fettling I've managed to remove this NRV. I have access to a basic workshop at work so was able to put the tool in a vice and ream it a bit with a drill. Essentially, the tool was the correct width but too short in the other dimension as I suspected. As you can see from the pics, it's not a slot type tool but one with a hole the same shape as the valve. The first pic is the tool as I received it, then after my mod. It doesn't look much but it made all the difference, maybe half a mm each end and I could feel it bite on the nrv. Once the tool fitted it came out very easily, I'd pre soaked in WD40 all day. A little more fettling means the valve now sits all the way into the tool as opposed to half way as in the pic. So whilst the jet and nrv are the same width, on mine at least the nrv is a little longer. I'm pleased to see the lead washer come out with the nrv! I also note that the pip in mine is in a brass holder but is definitely not viton, seems very spongy and has a big indentation in it. Does this mean its been replaced fairly recently? I have a new brass holder and pip from the fettlebox to refit. Even though it came out fairly easily, I'm tempted to put a dab of copper grease on the threads when I refit - is there anything wrong with that? This means I now have everything in bits. Some of it is now also clean! Unfortunately my opportunities to work on this are very few and far between so it could be a few weeks before it goes back together! Pics of that will of course follow... Thanks for all the valuable advice, it's appreciated.
Hi, I am really pleased that you were able to analyse and fix the problem of removing the NRV. a couple of comments; A small amount of copper grease on the threads of the NRV will not cause a problem and is a good idea. The rubber-type compounds used to make NRV pips typically fail by either.. 1. hardening to the extent that they lose flexibility and the ability to make a leak-proof seal, or 2. Absorbing the fuel, swelling and disintegrating. Ross will have provided a pip made with an appropriate compound, which he subjected to thorough testing. Look forward to seeing your stove in action. Best Regards, Kerophile.
@noise_boy I have had to do the job you’ve done on your NRV remover on a nipple remover for a silent burner. It was slightly short in the same dimension as yours. Good work. Cheers Tony
