Hi stovies This fettle is a first in two ways one this burmos21 touring stove is my first ever win using a bidding tool on ebay the one what trevor uses IE biddingscedular.com.The second is it is the first time in all the stoves and blowlamps i have fettled that i have had to remove the pump. The above pic shows the condition as it came the tin is in good condition and so are the instruction's as they are quite often torn in some way or have been soaked in spilt paraffin sadly the windshield and spirit bottle and pre heater are missing On with the usual all round inspection the pump cup had to be replaced and the filler cap washer was rock hard in fact it was one of the hardest washers i have come across it felt like Bakelite so that was replaced and the NRV seemed fine as air was pumped into the tank with no problem and no Viagra effect so it was stripped down for a clean up polish and burner decoke as it has become the norm for me to do even if it needs it or not so it is like a brand new burner with the heat resistant washers replaced so the it was then reassembled so now it was on to firing it up but once lit it soon died made sure the jet was clear that was fine so then realised there was a air loss some where so i emptied it out took of the burner assembly screwed down the plug where the burner goes and closed the air screw an then pumped about 20 strokes of air in the tank and then immersed in in the sink full of water and then noticed a stream of bubbles coming from the top of the pump the nrv was obviously faulty even though the new leather pump cup pumped air into the tank perfectly it was unable to hold it back so out came my home made NRV tool what has removed some of the most stubborn NRV's but the NRV was well screwed in and i could not get a purchase on it the more i tried just made it worse so i gave up on it and decided to remove the pump and the base of the pump where the NRV is screwed in which I have seen in the fettling masters class. I would carry this out the next day. The next two above pics show the pump removed from the tank and the base of the pump desoldered so i can get to the NRV out how i removed it was by first of all taking out the pump rod then take off the leather cup and then screw the fittings that hold the cup on the pump rod and then screwed it back into the pump so i can pull on it when the solder is melted so that the pump will come out of the tank.I used the gas micro torch again for this job i did place a wet cloth under the tank just in case it melted the base in no time the pump was out the base of the pump being quite thick thicker than the wall of the pump took a lot more heat to melt the solder so i used my trustee old parasene half pint lamp for that You can see how the NRV is rounded off i put the NRV the part where the removal tool goes into a small vice and carefully with a pair of pliers unscrewed i. Here is the pump cleaned and ready to be soldered the solder used is just normal resin core solder and the flux is Fry's fluxite i used the wet and dry to clean and prepare the joint as well as the wire brush what is for cleaning in side of copper plumbing fitting's to clean in side of the pump just to be on the safe side Here is the pump soldered back together again And now the pump is soldered back into the tank i used the micro torch again for that i heated the bottom of the pump with the micro torch placing the solder wire on top as soon as the solder melted and flowed around the joint the heat was removed that way no other part IE the leg near the pump became loose And hear it is put back together and polished what i like about the burner on here there is a screw that can be removed so a straight jet removal tool can be used what makes jet removal so easy there are a few British stove makers that used that idea burmos and if memory serves me right RM used that as well And now it is fired up and burning with the famous cherry red a fantastic little stove as good as the 210 such a shame there are no lettering on the tank or even a decal sorry about the quality of this last pick but at least you can see the auto lighter i fitted to the burner
Hi Brian, you've done a wonderfull job on this Burmos! I too had to remove the pump on my Burmos 21 because the nrv could not be removed, infact there's a second Burmos 21 waiting for the same treatment! The resoldering is done very well, looks much better than mine . Again, great job! Regards, Wim
Many thanks Wim sounds like a common fault if possible with the burmos NRV's thread probably a coincidence im will look forward to seeing yours finished
nice one Brian looks a very tidy job any chance of a pic of your micro torch you mentioned please and a link to the ebay seller you mentioned that you got your polisher from as i can't find the link at the mo it was cheaper than most i have found irc atb Bill
Many thanks bill for your allways great feed back i will show the micro torch tomorrow as it is in the shed at the moment here is the seller of the buffing wheel Link i am pleased with mine i have three cotton mops and three grades of buffing wax in fact i polished this stove with it
nice one Brian i am determined to have a pop at this soldering malarkey and have bought a sievert torch but i'm filling my pants at the idea of using it so a smaller more controllable one might be best to start with i have to learn and you lot keep just getting on with it and i'm starting to feel like a bit of a numpty for being so scared/petrified 8-[ i thought you had been at your stove with the polisher i'm looking to get one, i was going to take the plunge today but just blew my wad on a nib 111c about ten minutes ago well i needed another 111 as i haven't had a new one for a week or two now btw i'm well impressed with your and Den's handy work, inspiring stuff keep it up mate
Hi Bill here are a couple of pics of the micro torch used for soldering the pump back into the stove tank I bought from machine mart for about £15.00 I used the paraffin lamp to desolder and solder the bottom of the pump where the NRV is screwed in this part is a lot thicker than the pump wall it was taking ages for the solder to melt when i was dismantling it with the micro torch so the above was used to dismantle and resolder if i whould have used the blow lamp to resolder the pump back into the tank then i would of had to take more steps in stopping any other soldered part IE the nearest leg as mentioned comming undone
nice one Brian i'll get one ordered as soon as i have sold a few more bit's on the bay, I might even try one of those little blue pencil torches as well as they are only a couple of quid and will be laugh to play with do you reckon the micro torch would be hot enough to do a small amount of silver soldering as i have a 111t that has a small leak inside the top, under the inner cap around the seam where the tube that takes the meths restrictor joins the burner head and i read that they can be repaired i also have a 111 that has a small leak where one the tubes joins the plate at the top and when switched off you can see a tiny flame coming from there, it acts like a pilot light if I switch the stove back on after a minute or so they are both already useless until fixed so i don't have anything to loose by trying and i can't keep on hoping on favours or posting stuff all over the place when i should be able to do it myself atb Bill
Your welcome Bill i very much doubt the micro torch would be hot enough for silver soldering it would melt the solder but to get the parts hot enough for the solder to flow is another matter the paraffin lamp just managed to silver solder that burner basket on the stem of that primus71 i had where the thred had gone on the basket and i had to solder it As it could not continue to conduct enough heat to keep the fuel vapourised
thanks again i'll get a micro torch and get a bit of practice in on my wrecked No5's and see how i fair and then when and if i feel confident i'll try out either the optimus blowlamp i have or bite the bullet and use the Sievert propane one, but i'm twitchy as hell about using that bad boy as i can see myself with a pile of parts where a stove used to be
