Home > VansAirForceForums

- Donate yearly (please).
- Advertise in here!

- Today's Posts | Insert Pics

Old 06-13-2019, 07:12 AM
DanH's Avatar
DanH DanH is offline
Join Date: Oct 2005
Location: 08A
Posts: 8,809

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.

Dan Horton
Barrett IO-390
Reply With Quote
Old 06-13-2019, 12:28 PM
Piper J3's Avatar
Piper J3 Piper J3 is offline
Join Date: Nov 2014
Location: Hinckley, Ohio
Posts: 1,526

To find leaking rivet try this...
and this...
Jim Stricker
Hinckley, Ohio (1OA2)
EAA #499867
PPL/ASEL 1970 - Sport Pilot since 2007
80 hrs Flying Aeronca Chief 11AC N86203
1130 hrs Flying 46 Piper J-3 Cub N6841H
RV-12 E-LSA #120058 AWC July 2012 N633CM
RV-12 Bought Flying Oct 2015 with 48TT - Hobbs now 511

LSRM-A Certificate 2016
Special Thanks... EJ Trucks - USN Crew Chief A-4 Skyhawk
MJ Stricker (Father & CFI) - USAAF 1st Lt. Captain B-17H

Last edited by Piper J3 : 06-13-2019 at 01:46 PM.
Reply With Quote
Old 06-13-2019, 05:59 PM
jdmunzell jdmunzell is offline
Join Date: Jun 2005
Location: Hamilton, VA
Posts: 419

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!
-8 wings, finishing up
-8 QB Fuse just arrived!!!
Reply With Quote

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump

All times are GMT -6. The time now is 02:49 AM.

The VAFForums come to you courtesy Delta Romeo, LLC. By viewing and participating in them you agree to build your plane using standardized methods and practices and to fly it safely and in accordance with the laws governing the country you are located in.