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Leaking tanks

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jef.vervoortw(at)telenet.
Guest

Posted: Sat Apr 15, 2006 5:11 am Post subject: Leaking tanks

Testing my tanks, air is coming out at the inboard ribs around the outer

side of T-408 cover plate mounted with the T-407 cork gasket.



On one tank at two places between two screws, on the other almost all

around.



 



I assembled following Vans instructions, but adding a very thin layer of

sealant on both sides of the cork around the inner opening.



 



I suppose it's not a good solution to just put some sealant or Locktite on

the outer edge of the cover plate + cork to end rib as assembled now.



 



I would plan to unscrew and clean it, and re-assemble the cover plate

without cork gasket but with a normal layer of sealant?



 



Should I re-use the screws?



 



Suggestions or thoughts most welcome.



 



Jef Vervoort 91031.

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aurbo(at)ak.net
Guest

Posted: Sat Apr 15, 2006 6:15 am Post subject: Leaking tanks

Jef,



How long did you wait before you tested the tanks with air pressure? How 

much air pressure did you use? If the leaks are only in that area where you 

describe your solution to take the plates off and reseal them with out 

gaskets would work, just use plenty of sealant and give it time to cure.



Yes, you should probably use new screws, or better yet can some stainless 

steel cap screws.



Mike Ice

RV-9 91013

---

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rvlist(at)rv9a.deru.com
Guest

Posted: Sat Apr 15, 2006 7:17 am Post subject: Leaking tanks

Jef Vervoort wrote:

 	  Quote: 	
		   Testing my tanks, air is coming out at the inboard ribs around the outer

 side of T-408 cover plate mounted with the T-407 cork gasket.

..
	


 	  Quote: 	
		   I would plan to unscrew and clean it, and re-assemble the cover plate

 without cork gasket but with a normal layer of sealant?


	


I put my cover plates on with NO cork gasket - just a liberal amount of 

proseal.  No leaks after 1 year of flying.



Recommend you remove the covers, remove all the old proseal, and reseal 

with no cork gasket.  When you put the screws back in, dip them in 

proseal first.  Wait at least a week to 10 days before retesting.



Don't use Loctite on a problem that can be "properly" fixed by 

resealing, especially if you still building.  If the leak is 

substantial, it is doubtful the Loctite would do much good anyway.



If you haven't already seen Van's service bulletin on the pick up tubes, 

be sure to do this before reassembly.

-- 

Tim Coldenhoff

N194TC - 2.5L Egg Subaru powered RV9a

http://rv9a.deru.com

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rv9ralph(at)flash.net
Guest

Posted: Sat Apr 15, 2006 9:42 am Post subject: Leaking tanks

Do not eliminate the cork gasket. If you have to reopen the tanks after

the sealant sets, the cork gasket is the sacraficial element to open. If

you seal metal to metal with sealant (proseal or Permatex Aviation Form

A Gasket Fuel Tank Sealant) you will not be able to open the tank

without damaging metal.



Ralph - wings (tanks) - fuse in the box

Livermore, CA

Do not archive



[quote] --

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