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Fuel tank leak: Update

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GrummanDude

Joined: 15 Jan 2006
Posts: 926
Location: Auburn, CA

Posted: Fri Jun 20, 2008 10:10 pm Post subject: Fuel tank leak: Update

The most important lesson I've learned on this repair is that the lo-adhesion sealant, PR 1428, is VERY difficult to remove.  It's rubbery and the surface is slick.  The correct sealant, PS 890, will scrape and tear off in chunks.  The 1428 is like silly putty; it'll stretch and then slip out of the needle nose pliers.  So far, I've got 30 hours in cleaning out the old sealant.   

 

  I'm having a helluva time getting the 1428 out from between the spar and the wing skin.  It's globbed in and I can't get it out.  The really bad part is that the 1428 closes off 90% of the gap, lengthwise between the ribs, between the spar and wing skin.  The 1428 completely fills the gap and is about 1/2 inch thick along the spar.  

  

 

  Any ideas?  

  

 

  I've tried thin scrapers.  I can't get the scraper more than about 1/8 inch before the scraper gets stuck.  

  

 

  I tried a hacksaw blade to see if I could cut it down.  It won't cut.  

  

 

  I'm going to try dental floss to see if I can cut it away from the spar.  

  

 

  Safety wire?

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Gary
AuCountry Aviation
Home of Team Grumman

Discover

Joined: 26 Feb 2007
Posts: 429

Posted: Sat Jun 21, 2008 4:04 am Post subject: Fuel tank leak: Update

Punt.....Remove wings skins...take about an  hour with a good heat gun.....install new wing skins....probably take less time  than more scraping and will give plenty of access room to reseal tanks.. Garner  has new wing skins already bent or you can bend your own like this:

  

 http://bd-4.org/wings_steere14.html

 and next page

  

 While your at it get STC to put Yankee leading  edge on Tiger wing!

  

  

 [quote]   ---

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greg(at)ketell.com
Guest

Posted: Sat Jun 21, 2008 7:39 am Post subject: Fuel tank leak: Update

An off-the-wall idea: how about a "hot wire" knife like they use to  

cut foam?  Try it outside the tank first.  



GK

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