Majic, Ken, The main point Ken makes is the need for fuel resistant. Majic, re "No worries bout the oring, get it anywhere" is a quote I would think you may want to (soon forget? or ) clarify somehow? An o ring from a hardware store "might" work but Ken's advice is good. As for Harbor freight quality yes and no, they sell ALOT of poor quality (as do many hardware & auto parts stores not as much, yet) BUT imo if it is labeled as fuel resistant it probably is. Let's say you "buy o ring anywhere" FYI before installing at least do one quick check, if gasoline makes it slimy right away do not use it (if it holds up it might be ok). To Ken's point MANY o rings if exposed to gasoline WILL melt right away. thx omc
Must be getting lucky none of my black Orings have melted from fuel. Nope, don't wish to forget or clarify. People are too worried about too many things and always want to sound like experts cause they can find fault with something or another. Life has lots of things that go BANG if you spend your life worrying about all those things you will never get anything done. Thermos used black orings. I really don't know what they were made out of, likely not vitron. Go grab an oring and stick it in there. Does vitron have the same sealing qualities as that OE black oring?? Tis a rather poor design in the first place. Not bad advice to soak it in fuel and see if it softens, bet if I grab a few orings from various places and soak em none of em turn soft.
Hi Majic, +1 w/you [at least] "soak it in fuel and see if it softens". I buy a fair amount of o rings from hardware stores for plumbing. So why not, I grabbed 2 o rings and submerged them in gas for less than a minute. The larger one quickly melted. The smaller one, all I know is it didn't melt right away but after gas bath both left black on my fingers. Both ARE for plumbing. thx omc
They color Orings according to what they are supposed to resist, or something along those lines. I know in the automotive end of things the green Orings are to work better with fuels with alcy in em.
Doing some research: Absolutely. The most common color is black, but brown, green, and rust are also available. Keep understand that changing from a black material to a colored one can reduce the material's compression set resistance and / or physical properties.
More: Buna-N (Nitrile) Standard: 70 Durometer Black Temperature Range: -35ºF to 250ºF Least Expensive / Readily Available Silicone Greases / Oils Water Petroleum Oils / Fuels Ethylene Glycol Fluids
Just gonna link this, but it shows that viton has different mechanical properties than a Buna-n(black) oring.... http://www.marcorubber.com/materialguide.htm
More: Buna/ Nitrile Link to contact us page Link to custom request for quote page Resistant To Oil, Air, Water, Gasoline, Engine Coolant, Silicone Greases, Hydraulic Fluids, & Alcohols. Standard Color is Black. Standard Hardness (durometer) is 70. Operating Temperature Range: Low Temp: -40˚F/C High Temp: 250˚F / 121˚C
You will notice that all the black Orings I have been able to find on-line so far are compatable with fuels....
Hello again Majic, If you are saying no one sells plain old basic "rubber" o rings for plumbing that certainly could be and news to me. We're "always learning something on CCS". Neither of the o rings I dipped in gas were new. It DID react much like our rubber shoes melt when we step in a little gas spilled at the gas pump (fuel instantly eating rubber that many can relate to). So Buna-N (Nitrile) o rings are the cheapest available, ok (and resists Petroleum Oils / Fuels). Just from recall seems, at least to-date anyway, for me most often "fuel" applications are specified be it hoses, seals, gaskets, gaskets sealers, thread sealers... I'm just sayin, that is what jives w/my own past experience. If that is changing and already no longer applies to o rings that is news to me and that truth will be known easy enough. IF? Please don't take offense w/my "IF" as Billy Joel says "I maybe wrong and you maybe right" it all comes out in the wash. thx omc
Depending on the Nitrile, it will last about 1 year to 2 as a fuel cap gasket. I've made gaskets and have used O-rings made of Nitrile. They are fuel resistant for a while, but not as long as Viton. Viton is harder to compress than Nitrile so apply the correct material for the individual job it has to do. sam
"Thermos used black orings. I really don't know what they were made out of, likely not vitron" Considering Thermos stopped making gasolene stoves before viton was invented that is a possibility. They would of been nitrile rubber which used to be the best option available and if you get the same nitrile rubber as was originally used they will be ok although not as good as viton. Trick though is that some manufacturers have less nitrile in there rubber and these are no good and unless you have the manufacturers info there is no way to tell before the inevitable happens and the light you see is yellow and quite big. Never put silicone near fuel The wife did by mistake although she still believes it was my fault. Gat back from a hike late and left her to unpack my gear while I went to work the following day. She emptyed my drink bottles into the sink where a silicone baking dish was When she emptyed the bottle that wasnt drink the dish nearly jumped out of the sink. Luckily no one in the neighbourhood smokes.Once the gas evaporated it returned to normal.
Hi, I have been following this correspondence with interest. However, some of us must have a strong sense of " Been here before": https://classiccampstoves.com/threads/11804 If you work with classic stoves and are renewing safety-critical seals and washers it pays to take care. Even if you take a relaxed view on safety, those around you might not. Best Regards, Kerophile.
That sums it up well Geeves. Finding decent nitrile is hard to impossible, certainly in the UK. Using nitrile undet compression such as in a filler cap opend the rubber up & allows fuel to disolve the non nitrile constituents. I measure washer life in 'Newarks'. With original Tilley or 3rd party washers I would fettle a lamp for or stove to use at the annual Newark gathering. By the following year the seals had turned to mush or cracked due to UV. With Viton I'm up to 3 Newarks & still going strong. Given that most 3rd party offerings are not Viton but cost the same or more they really aren't value for money. The alternative view is the Fettlebox has a terrible business model making seals that last too long! I guess I'm a collector/user first & business 2nd. The whole Fettlebox/Viton thing was born out of my own frustration with poor quality seals rather than a desire to get rich.
Majic, Members feel compelled to comment for safety sake. You have some good input and you HAVE helped gbouwman, you show by example you are part of all the abundant good here. I viewed the helpful links, yours and Kerophile's Nitrile schmitrile, I note page 3. Maybe in this meanwhile your research may have found addl *to-date info (*"...schmitrile is'09, a post I hadn't seen, THANK YOU) if, yes only if, you have found more good details and if you may want to share, I'm learning from you and others here and, seriously, I'd appreciate addl current sources? So i post as 1. I'm thankful for your input Majic. I also post as... 2. Nitrile's limited HEAT resistance hasn't been aired much here (not a factor in your link). So a reminder it's both fuel and heat resistance to consider. Granted w/thermos pump, heat is less a factor than elsewhere, say tank lid seals? 3. O rings dissolve, results in particulates in fuel, particulates in the flow of fuel to the various burners is not good and also not aired much here. (I left the small o ring soak overnight, I saw the particulates dissolved from it, it made fuel cloudy when I disturbed it. thx omc
Hi, Sam: Well I hope the pics show the flame burning on my Old Thermos Camp Stove. The o-ring I found that did the job was 3/8" x 1/4" x 1/16". The original decals that indicated make of stove and instructions were not readable any more so I printed new instructions. (Note the use of Duck Tape)
Bravo! Glad you got her running! Now, just keep a few of those O-rings around and you will be able run that stove for the rest of your life! I _do_ like the flame pattern on those Thermos burners as well. sam P.S.: I have relatives in Graham!
