There has been lots of talk over the years about poor performance when using the 'O' ring pump rod in a 111. Anyway, today, I went to use a 111T, 'O' ring type and the ring had failed. I have used the stove many times and kept the ring lubed with silicone paste and its served me well, so the question is, was I just lucky, or, with a little silicon, are these rings OK after all? I don't have a replacement ring, but I did have a new rod with pump leather so the stove is up and running again.
Hi rik_uk3 I've had good and bad experiences with the o-ring pump rod for my 111T. I experimented with a few o-rings i found at the auto parts store and i found one that was a micro millimeter larger in diameter than the original (which was crap) ,i could barely fit into the pump tube but eventually got it in. The pumping action felt tight,rough and not smooth at all even lubed up.But let me tell you with about 40 strokes or so i could boil 1 L of water in about 3.5 Min!! I kept this setup for awhile then i saw a leather pump rod from an old primus stove listed on e-bay and i figured what the hell i'll put in a bid and won. I installed it and emediately noticed how nice and smooth it was and build up awsome pressure. I find those o-rings too tempermental some work okay others are crap,if i placed my original o-ring and the one i bought on a white sheet of paper laying flat you wouldn't tell the difference but the original (worn out) one wouldn't build proper pressure even if you pumped the stove 100 times! I highly recommend a leather pump rod for this gem ,turns a great stove into an awsome stove! Take care
I've got one of those O-ring jobbies on an Optimus 00 stove. At best I could describe the pumping action as lumpy and prone to sticking. I used 2 Optimus 00 stoves at the week end, the other one has a traditional pump leather, and the difference in the action is quite obvious. What I need is a handy fettle to replace the 0-ring with a leather bucket assembly, I don't want to lose the storage location for the transport cap on the end of the pump handle. Anyone got any ideas?
I got the spare pump rod/leather included in this lot http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=170182433653 The NRV's have a big diameter but the spring and plug fit the standard 111 type NRV OK
I agree that a leather bucket is a better design than an o-ring for this purpose, as eg. lack of lubrication will wear down an o-ring rather quickly. That being said, if kept lubricated the o-rings in my two 111s work very well. Also, o-rings are cheap, weigh nearly nothing and are easily replaced. If I come across the proper parts I will rebuild the pumps to leather buckets, but in the mean time the o-rings work well enogh for me. Knut
You need to find a spare bucket carrier, and a mate with a lather to turn the shaft down a little, and then cut the appropriate thread . . . .or use a die. It might be easier to look out for a junk stove with a decent pump rod.
' I had poor performance on these O-ring pumps until I got some very fat and sticky silicone. Rubber and silicone is OK - but it must be of the very sticky type. But - there are nothing better as "sefa" pump leather.
Cheers Keith, Oddly enough, I have a spare pump rod from a 111B ( .. how did that happen .. ) but I lose the option to secure the transport cap on the pump handle if I use this. Hmmmmm , where might I find a spare #00 or #45 pump rod ? The truth, and nothing but the truth!
Yes with a lathe and some brass ....................... I have done it on several of my 111's. But with a spare brass "holder" for the "sefa" leather cup, you only has to make some threads on the lower end of the pump rod and secure with a nut. But after I got this sticky fat silicone I don't need to do this modifying anymore.
OK, got a Q, are the pump leathers from pressure stoves and that (and the O rings) of the 111s the same diam?
If I understand your Q. correctly, leather pump buckets for #96 stoves are different to those for #00 are different to those for #111 etc.etc.etc. (actually, maybe those for a #00 & #111 are the same size. ) Sefa does a selection of sizes ( alliteration overload ) all of top quality.
that's basicly what I was asking; if the pump leathers of a 00/210/21 etc wld work w/ a 111X. Sounds like it will.
but, it seems the other way wld do it? Neil was using the pump rod and leather on his 111T til I needed it for the 00/210 it came from. I guess cuz the leather can "squish" up a bit?
I don't know one way or the other. I do know that as soon as everything comes together I going to be making some pump rods and they are to be made to work for Sefa's leathers. The 111 is just to fine of a stove to put up with this "O" ring trouble. Folks, life is to short to have to put up with the "O" ring problems. If there was enough demand, I would do this as a CNC project and do hundreds in a an afternoon.
