Runtoeat Posted April 12, 2012 Report Share Posted April 12, 2012 Tip, if you've got a couple of the "O" rings, I'll buy 2. Let me know the total and I'll send you payment with self addressed stamped envelope to use for sending the rings back to me. You can just post here or send me an email. reh3335@yahoo.com. Thanks. Kurt, I'm not familiar with Krytox grease. Would a light coating of Mobile 1 synthetic grease work? Link to comment Share on other sites More sharing options...
chanik Posted April 12, 2012 Report Share Posted April 12, 2012 Not for any length of time. Any other grease will soften and dissolve in gasoline. Krytox 240AC is what I use but any of the thicker ones will work. There's always a bunch of sellers on ebay. I replaced my seals in the Tuff-jugs too since those O-rings were going bad and the outer plastic filler neck needs to seal well but also slide against the inner part. I haven't had to re-grease it even a year later. Link to comment Share on other sites More sharing options...
wlfpckrs Posted April 12, 2012 Report Share Posted April 12, 2012 I run E10 almost exclusively. Can't say I've seen any problems except the gas cap o-rings. It's also worth changing the fuel filter every 100hrs instead of 200hrs I think. Could have just been age, but anyway I replaced them with VITON style rings: Product ID: ov-75-222 Product Name: Fluorocarbon 222 Size O-ring Quantity: 2 Unit Price: $0.64 from http://www.superiorseals.com/ I want to make sure we are talking about the same thing. The part listed above, I believe, is for the CTLS. I am looking for o-rings for the CTSW. They don't carry the same gas cap o-ring. Link to comment Share on other sites More sharing options...
Runtoeat Posted April 12, 2012 Report Share Posted April 12, 2012 Kurt, thanks for the grease info. Link to comment Share on other sites More sharing options...
gisurvey Posted March 10, 2014 Report Share Posted March 10, 2014 Hello everybody, Could anyone give me the exact dimensions for O-rings please? I'm looking for 222 size and seems to be too small (37.70mm ID) compared with the real dimensions of fuel cap o-ring seat (cca.53mm). Can anyone confirm that is 222, with 37.70mm ID? Also, what is the original size for the small O-ring under the axle,under the nut? Thanks, Alec PS I think will be better if admin will move this topic to maint section. Link to comment Share on other sites More sharing options...
Jim Posted March 10, 2014 Report Share Posted March 10, 2014 CTSW maintenance manual calls out a 38mm x 3mm O-ring. Mcmaster-Carr stocks them in Buna-N and Viton. Link to comment Share on other sites More sharing options...
coppercity Posted March 10, 2014 Report Share Posted March 10, 2014 Hello everybody, Could anyone give me the exact dimensions for O-rings please? I'm looking for 222 size and seems to be too small (37.70mm ID) compared with the real dimensions of fuel cap o-ring seat (cca.53mm). Can anyone confirm that is 222, with 37.70mm ID? Also, what is the original size for the small O-ring under the axle,under the nut? Thanks, Alec PS I think will be better if admin will move this topic to maint section. The LS has a larger flush SPRL cap. I think this is the oring kit for it. http://www.aircraftspruce.eu/newton-sprl-cap-o-ring-kit.htm Link to comment Share on other sites More sharing options...
Roger Lee Posted March 11, 2014 Report Share Posted March 11, 2014 The Viton CTSW and LS "O" rings can be found at many Ace Aviation stores. I have them here at ours. Link to comment Share on other sites More sharing options...
gisurvey Posted March 11, 2014 Report Share Posted March 11, 2014 Thanks for your answers. Sorry, I've forgot: it is a CTLS 2008 with SPRL 65mm. I've tryed some different orings with 53x3/3.5mm, but the fuel continue to drip. With the correct/original size in hand, I can find the replacement faster locally , and cheap (btw, the transport from US is 40usd - the lowest one, and about 4 weeks freight time). Link to comment Share on other sites More sharing options...
gisurvey Posted March 13, 2014 Report Share Posted March 13, 2014 Maybe someone else will need the info below. OH kit SPRL 65mm fuel cap (CTLS 2008), info from Rob, original designer http://www.newtonsprl.co.uk/: 57x3 and 6x2 Viton. 10.32 nuts. Link to comment Share on other sites More sharing options...
FlyingMonkey Posted March 13, 2014 Report Share Posted March 13, 2014 Not for any length of time. Any other grease will soften and dissolve in gasoline. Krytox 240AC is what I use but any of the thicker ones will work. There's always a bunch of sellers on ebay. I replaced my seals in the Tuff-jugs too since those O-rings were going bad and the outer plastic filler neck needs to seal well but also slide against the inner part. I haven't had to re-grease it even a year later. Really, $205 for 2oz of that grease?!? http://www.skygeek.com/dupont-lubricants-grease-240ac-2-oz-tube-240ac2oz.html?utm_source=googlebase&utm_medium=shoppingengine&utm_content=dupont-lubricants-grease-240ac-2-oz-tube-240ac2oz&utm_campaign=froogle&gclid=CKaIvPfWj70CFUNo7Aodsg8Abw Link to comment Share on other sites More sharing options...
Doug G. Posted March 13, 2014 Report Share Posted March 13, 2014 Krytox 205 is only $27 here. Not sure what the difference is. http://www.amazon.com/gp/aw/d/B004568IC2 Link to comment Share on other sites More sharing options...
chanik Posted March 16, 2014 Report Share Posted March 16, 2014 too thin at higher temps. Plus that tube is just 1/2oz. Amazon has the 240AC foe $124 Link to comment Share on other sites More sharing options...
Doug G. Posted March 16, 2014 Report Share Posted March 16, 2014 What kind of high temps see you talking about on an O-ring for the fuel filler? Link to comment Share on other sites More sharing options...
chanik Posted March 16, 2014 Report Share Posted March 16, 2014 240AC goes from 800 to 270 20C to 38C http://www2.dupont.com/Lubricants/en_US/assets/downloads/H-58519-7_Krytox_Aero_Grade_Oils_and_Greases.pdf 205 is sort of OK at 160 cSt but 204 or thinner is like a thin oil at 40C. http://www2.dupont.com/Krytox/zh_CN/assets/downloads/H58510_1.pdf For comparison 160cSt is about the viscosity of 40W motor oil at 40C Link to comment Share on other sites More sharing options...
Doug G. Posted March 17, 2014 Report Share Posted March 17, 2014 I must be reading that second chart wrong. I am seeing a useful range of -33 to 400 F and a viscosity of 160 at 40 degs. C under the 205 column. What am I missing? Link to comment Share on other sites More sharing options...
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