Badmoonraising Posted February 28, 2017 Report Posted February 28, 2017 Just wanted to share this with others whom must park their Mooney's outside. The previous owner warned me that water can migrate into fuel tanks so I made this magnetic rain cap. To be honest I copied the idea from an AME on the same field as me. In his case he used a tupperware lid. I couldn't find the same lid so I made my own. I vacuum formed thin polypro over a ceramic magnet purchased at Home Depot. Then I stacked the remaining magnets on the vacuumed magnet. The seal is glued to the plastic. It seems to hold well. I plan to wrap some black tape around the exposed magnets so they are not knocked off when I throw the rain cap in the back of the plane. 3 Quote
Alan Fox Posted February 28, 2017 Report Posted February 28, 2017 I have also seen guys that just take the handles off of toilet plungers... 2 Quote
Hank Posted February 28, 2017 Report Posted February 28, 2017 I can feel Norman smiling down at you! He sold a similar item held down with velcro. 1 Quote
jlunseth Posted February 28, 2017 Report Posted February 28, 2017 That's a great idea. I once sumped about a pint and a half of water/gunk out of a rental Mooney that had suffered that exact failure. Goo lesson in why we always sump. Quote
RobertGary1 Posted February 28, 2017 Report Posted February 28, 2017 I've been outside for two decades. I change the two seals at annual and never found a drop of water in the tanks. Some drops will slip by when you remove the cap but the fuel suspends a certain amount of water anyway (otherwise you'd always have water from internal condensation) -Robert Quote
LANCECASPER Posted February 28, 2017 Report Posted February 28, 2017 On Beechtalk there's a guy that sells the high quality blue Fluorosilicone orings at a good price. Well worth it! https://www.beechtalk.com/forums/viewtopic.php?f=44&t=130666 1 Quote
Mooneymite Posted February 28, 2017 Report Posted February 28, 2017 11 minutes ago, LANCECASPER said: On Beechtalk there's a guy that sells the high quality blue Fluorosilicone orings at a good price. Well worth it! https://www.beechtalk.com/forums/viewtopic.php?f=44&t=130666 Are these the right ones? https://www.amazon.com/gp/product/B0055E1RLM?psc=1&redirect=true&ref_=oh_aui_detailpage_o00_s01 Quote
DAVIDWH Posted February 28, 2017 Report Posted February 28, 2017 Do you have a patent # or trade name yet. (Not sure these will help, but) If not it will soon be manufactured in Chon Ching and sold at Walmart. Well done!! Quote
Andy95W Posted February 28, 2017 Report Posted February 28, 2017 44 minutes ago, LANCECASPER said: On Beechtalk there's a guy that sells the high quality blue Fluorosilicone orings at a good price. Well worth it! https://www.beechtalk.com/forums/viewtopic.php?f=44&t=130666 I'm still a little skeptical about the ability of the material to handle the specific compounds present in 100LL fuel. Also, for that price, I think I'll just keep replacing the o-rings regularly with the standard MilSpec fuel resistant parts. Quote
gsxrpilot Posted February 28, 2017 Report Posted February 28, 2017 I change the O-rings a couple of times a year and have never had a drop of water in the tank. 1 Quote
LANCECASPER Posted February 28, 2017 Report Posted February 28, 2017 12 minutes ago, Andy95W said: I'm still a little skeptical about the ability of the material to handle the specific compounds present in 100LL fuel. Also, for that price, I think I'll just keep replacing the o-rings regularly with the standard MilSpec fuel resistant parts. Quite the opposite - the fluorosilicone handles fuel much better than the standard o-rings. http://www.csobeech.com/fuel-caps.html Quote
LANCECASPER Posted February 28, 2017 Report Posted February 28, 2017 49 minutes ago, Mooneymite said: Are these the right ones? https://www.amazon.com/gp/product/B0055E1RLM?psc=1&redirect=true&ref_=oh_aui_detailpage_o00_s01 They are the ring one for the outside ring but they are also more expensive than getting the kit from the guy on Beechtalk. His kit includes both o-rings and the cotter pin. Make sure you replace the small o-ring inside since water sits in the recess of the center of the cap and can get past a bad o-ring easily. http://www.csobeech.com/fuel-caps.html 1 Quote
Marauder Posted February 28, 2017 Report Posted February 28, 2017 They are the ring one for the outside ring but they are also more expensive than getting the kit from the guy on Beechtalk. His kit includes both o-rings and the cotter pin. Make sure you replace the small o-ring inside since water sits in the recess of the center of the cap and can get past a bad o-ring easily.http://www.csobeech.com/fuel-caps.html I think I asked before. Are these for the non-bladder caps?Sent from my iPad using Tapatalk Pro Quote
RobertGary1 Posted February 28, 2017 Report Posted February 28, 2017 3 hours ago, LANCECASPER said: Quite the opposite - the fluorosilicone handles fuel much better than the standard o-rings. http://www.csobeech.com/fuel-caps.html How many years does it need to last though? Changing annually I've not had fuel get into the tank in 20 years of being outside just using the standard rings. -Robert Quote
Marauder Posted February 28, 2017 Report Posted February 28, 2017 How many years does it need to last though? Changing annually I've not had fuel get into the tank in 20 years of being outside just using the standard rings. -Robert You must be getting great fuel economy if you never needed to add fuel in 20 years. The gaskets on my bladders are fluorosilicon and have been on the plane for a long time. They don't leak and my mechanic told me that they are still fine. Then again, they were $50 each for the big ones and I am sure he made sure they were fine.Sent from my iPad using Tapatalk Pro 1 Quote
Yetti Posted February 28, 2017 Report Posted February 28, 2017 Life time supply for the inners https://www.amazon.com/dp/B00138384I/ref=biss_dp_t_asn 010 is the size. There are two per cap. Good reminder to check my inners. Quote
Bob_Belville Posted March 1, 2017 Report Posted March 1, 2017 6 hours ago, Marauder said: You must be getting great fuel economy if you never needed to add fuel in 20 years. The gaskets on my bladders are fluorosilicon and have been on the plane for a long time. They don't leak and my mechanic told me that they are still fine. Then again, they were $50 each for the big ones and I am sure he made sure they were fine. Sent from my iPad using Tapatalk Pro Do they get lubed at annual? DC4? Quote
Marauder Posted March 1, 2017 Report Posted March 1, 2017 Do they get lubed at annual? DC4? Nope, nothing that I can tell. Sent from my iPad using Tapatalk Pro Quote
1964-M20E Posted March 1, 2017 Report Posted March 1, 2017 10 hours ago, Marauder said: I think I asked before. Are these for the non-bladder caps? Sent from my iPad using Tapatalk Pro I beleive they are the ones for the non bladder tanks. Those of us with bladders have an odd o-ring. 1 Quote
M20F-1968 Posted March 1, 2017 Report Posted March 1, 2017 After reading this thread, I still am not convinced I have good data leading me to replace the MIL spec O-rings. 1) I believe that the fluorosilicone O-rings last longer than the factory originals, but I do not know how much longer than the 1 year recommended change interval is to be expected. Has Mooney chimed in on this making a recommendation? 2) If they could be obtained a 2X the cost, rather than 5-10X the cost, perhaps it would make sense to use them and change annually, thinking that they will be a better product. 3) I have not yet seen any data on what the true replacement part number and dimensions of the new part. It may not be just measuring them as the density/compressibility of the Fluorosilicone must also be considered. 4) Can someone who has used them post the dimensions, part number and source of the Fluorosilicone parts and I'll give them a try? John Breda Quote
mooniac15u Posted March 1, 2017 Report Posted March 1, 2017 1 minute ago, M20F-1968 said: After reading this thread, I still am not convinced I have good data leading me to replace the MIL spec O-rings. 1) I believe that the fluorosilicone O-rings last longer than the factory originals, but I do not know how much longer than the 1 year recommended change interval is to be expected. Has Mooney chimed in on this making a recommendation? 2) If they could be obtained a 2X the cost, rather than 5-10X the cost, perhaps it would make sense to use them and change annually, thinking that they will be a better product. 3) I have not yet seen any data on what the true replacement part number and dimensions of the new part. It may not be just measuring them as the density/compressibility of the Fluorosilicone must also be considered. 4) Can someone who has used them post the dimensions, part number and source of the Fluorosilicone parts and I'll give them a try? John Breda Mooney specifies MS29513-010 and MS29513-338 per Service Bulletin 229A http://www.mooney.com/en/sb/M20-229A.pdf AD 85-24-03 requires compliance with Mooney SB 229A. I don't see how the fluorosilicone o-rings are a legal replacement. 1 Quote
Marauder Posted March 1, 2017 Report Posted March 1, 2017 Does anyone know the part number for the ones on the bladder system?Sent from my iPad using Tapatalk Pro Quote
Yetti Posted March 1, 2017 Report Posted March 1, 2017 http://ph.parker.com/us/en/fluorosilicone-70-durometer-o-ring-blue-mil-aero-lm159-70 Quote
LANCECASPER Posted March 1, 2017 Report Posted March 1, 2017 9 hours ago, M20F-1968 said: After reading this thread, I still am not convinced I have good data leading me to replace the MIL spec O-rings. 1) I believe that the fluorosilicone O-rings last longer than the factory originals, but I do not know how much longer than the 1 year recommended change interval is to be expected. Has Mooney chimed in on this making a recommendation? 2) If they could be obtained a 2X the cost, rather than 5-10X the cost, perhaps it would make sense to use them and change annually, thinking that they will be a better product. 3) I have not yet seen any data on what the true replacement part number and dimensions of the new part. It may not be just measuring them as the density/compressibility of the Fluorosilicone must also be considered. 4) Can someone who has used them post the dimensions, part number and source of the Fluorosilicone parts and I'll give them a try? John Breda https://www.beechtalk.com/forums/viewtopic.php?f=44&t=130666 Quote
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