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  #11  
Old 06-13-2019, 07:12 AM
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DanH DanH is offline
 
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Quote:
Originally Posted by Carl Froehlich View Post
Like Larry said, build new tanks. Find a local builder to assist. I offer that this is just the first indication of a host of problems.
Agree 100%. Obvious craftsmanship issues are a red flag. There will probably be more.

For example, clean away the proseal at the countersunk rivet line along the rear flange. Gauging the diameter of the countersinks tells the depth. The tank skin thickness is already at the minimum for an MS20426-3 countersink. Can't un-cut a countersink. The only fix is to replace the skins.



Take a good look at all the rivet heads. Use a 10x magnifier. An oversize countersink means the outer perimeter of the head is unsupported when the rivet is squeezed or hit. Here are two examples; note countersink diameter compared to rivet head, and the cracks.





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  #12  
Old 06-13-2019, 12:28 PM
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Piper J3 Piper J3 is online now
 
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To find leaking rivet try this... http://www.vansairforce.com/communit...2&postcount=28
and this...http://www.vansairforce.com/communit...1&postcount=30
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Last edited by Piper J3 : 06-13-2019 at 01:46 PM.
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  #13  
Old 06-13-2019, 05:59 PM
jdmunzell jdmunzell is offline
 
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It sounds like you now already own these tanks. In that case, good luck with all the repairs mentioned above. If you DO NOT yet own these tanks, I would wonder in general about the entire construction quality. Not cleaning up all that proseal on the exterior of the tanks just seems like sloppy workmanship to me. Not to mention the number of leaking rivets!
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