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06-03-2013, 09:51 PM
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Join Date: Nov 2010
Location: West Linn, Oregon
Posts: 1,351
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Just had this happen to me on my left tank. Anyone happen to have one of these tools made up and sitting around?
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CharlieWaffles - But you can call me " Mark"
RV-10
N928MT
Flying - AKA Still Tinkering
Build Project Site
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02-27-2014, 05:50 AM
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Join Date: Apr 2005
Location: Indepenence, Oregon
Posts: 342
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I hate to bring this old thread to life, but my -10 has developed a leak in the right tank vent line. The wings were quick built. It appears that the interior vent fitting nut is loose.
The tank was filled completely when I did my fuel tank level calibration, but I did not see it then. After the first two flights, the tank vent is leaking. The tank is at about 20 gallons so the only two possibilities are a hole in the tubing or the "B" nut has loosened up.
Called Vans and Sterling came up with this thread. Not only that, he is going to fabricate a tool like the one in the first post and send it to me. After I use it, I will send it back to Vans and they will have it in case the issue comes up again.
Won't stop the flight test program, I can put a plug in the vent when on the ground an loosen the filler cap. Will report the results in a few days. I have to miss a couple of days of testing for another reason.
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Bruce Patton
Rans S-20 Raven 796S flying since 2019 (slowly)
RV-6A 596S flying since '99 (Sold)
HP-18 5596S flying since '89
RV-10 996S flying since 2014, quick build wing and slow build fues., - dual Skyviews with complete system, two radio and not much else. Interior completely finished with Zolatone. CF plenum. 1624 lbs, FLYING after a 21.5 month build.
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02-27-2014, 06:25 AM
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Join Date: Apr 2009
Location: USA
Posts: 1,499
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Quote:
Originally Posted by bpattonsoa
Won't stop the flight test program, I can put a plug in the vent when on the ground an loosen the filler cap. Will report the results in a few days. I have to miss a couple of days of testing for another reason.
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And do what to it when you are test flying?
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Good judgment comes from experience, and a lot of that comes from bad judgment.
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02-27-2014, 10:15 AM
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Join Date: Nov 2010
Location: West Linn, Oregon
Posts: 1,351
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I found it took me less than 2 hours to remove the tank, cut a hole in the bulkhead, tighten the B-Nut, apply some proseal and seal the tank back up. If you use the B 1/2 Proseal ( http://www.vansaircraft.com/cgi-bin/...roduct=proseal), it has a 30 minute working time and was completely cured in 24 hours. I waited 48 just in case. A much smaller issue than I had feared. Just be sure to clean out all the debris from cutting the hole.
__________________
CharlieWaffles - But you can call me " Mark"
RV-10
N928MT
Flying - AKA Still Tinkering
Build Project Site
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02-27-2014, 11:40 AM
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Join Date: Apr 2005
Location: Indepenence, Oregon
Posts: 342
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Quote:
Originally Posted by Wayne Gillispie
And do what to it when you are test flying?
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Left out, will remove the plug and put in the fuel filler cap. Will leak slightly while flying, but is not an issue.
Charlie ... That was my immediate reaction, but I will try the tool and see if I can avoid taking the tank off the wing. I think they ought to have the QB factory proseal the fitting. Then they would more than likely check to see if it is tight, so you get a double fix. When I was a Nuclear Power Plant manager, that nut would be a specific line check in the Q.C. program.
__________________
Bruce Patton
Rans S-20 Raven 796S flying since 2019 (slowly)
RV-6A 596S flying since '99 (Sold)
HP-18 5596S flying since '89
RV-10 996S flying since 2014, quick build wing and slow build fues., - dual Skyviews with complete system, two radio and not much else. Interior completely finished with Zolatone. CF plenum. 1624 lbs, FLYING after a 21.5 month build.
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02-27-2014, 01:16 PM
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Join Date: Aug 2007
Location: Zuerich, Switzerland
Posts: 147
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Build it yourself
Hi Bruce,
I had exactly the same issue, I built the tool myself in the most basic form and it worked well to tighten the nut. It takes some tries to really catch the nut and you might only be able to turn it a bit by each attempt but all together I was done in 4 hours if I recall correctly.
If you stay below 20 gal it shouldn't be a problem.
Good luck
Michael
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RV-10 builder (flying)
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Last edited by Michael Wellenzohn : 02-27-2014 at 01:17 PM.
Reason: correction
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02-27-2014, 02:35 PM
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Join Date: Nov 2010
Location: West Linn, Oregon
Posts: 1,351
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Quote:
Originally Posted by bpattonsoa
Charlie ... That was my immediate reaction, but I will try the tool and see if I can avoid taking the tank off the wing. I think they ought to have the QB factory proseal the fitting. Then they would more than likely check to see if it is tight, so you get a double fix. When I was a Nuclear Power Plant manager, that nut would be a specific line check in the Q.C. program.
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In my case, I had prosealed the nut as well, but it wasn't quite enough to counteract the loose nut. Admittedly if I had either tightened MORE or added MORE proseal the issue wouldn't have happened.
__________________
CharlieWaffles - But you can call me " Mark"
RV-10
N928MT
Flying - AKA Still Tinkering
Build Project Site
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03-03-2014, 12:27 PM
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Join Date: Mar 2007
Location: Denver, CO
Posts: 211
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Alternate approach
I had a similar problem with a dripping vent in my 10's QB tanks. I tried a different approach, and poured quite a bit of that green locktite (forget the number) used in fixing weeping tank rivets through the vent line with the line inverted, lightly blowing through it to keep it from pooling and blocking the line until it had dried (which isn't but a few minutes), then flipped the vent back to normal to further ensure it drained any excess. Fixed it, no issues since.
Dwight
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RV-10 #40762 - 100 hrs+
Denver, CO
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03-03-2014, 08:56 PM
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Join Date: Apr 2005
Location: Indepenence, Oregon
Posts: 342
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I finished the repair today (I hope). Mark, you were dead on, I could have removed the tank, punched the hole in the back and had it back together in about half the time.
Ended up with three cut down wrenches, all with different clocking. Put one on (not easy) and pushed it with my thumb as far as possible. Then remove the wrench (not easy when using the modified box wrench). Then put the wrench just used on the mockup and move it to its end position to set the mockup nut to its current clocking. Now check on the mockup which wrench will have its handle in the hole in the tank and repeat again.
It took about 1.5 turns to get the nut tight, about 1/6 turns per hour! I thought the seat support bracket was bad!
The nut was hard to turn at the start, just like a tube nut where things are not lined up.
__________________
Bruce Patton
Rans S-20 Raven 796S flying since 2019 (slowly)
RV-6A 596S flying since '99 (Sold)
HP-18 5596S flying since '89
RV-10 996S flying since 2014, quick build wing and slow build fues., - dual Skyviews with complete system, two radio and not much else. Interior completely finished with Zolatone. CF plenum. 1624 lbs, FLYING after a 21.5 month build.
Last edited by bpattonsoa : 03-04-2014 at 08:15 AM.
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03-07-2014, 04:20 PM
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Join Date: Apr 2013
Location: Southeast
Posts: 663
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What size wrench is it.
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