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View Poll Results: Slosh poll if built before 2000
Didn't use slosh to seal fuel tanks 52 48.60%
Slosh used and no evidence of peeling 25 23.36%
Found evidence of slosh peeling and rebuilt or replaced fuel tanks 13 12.15%
Found evidence of slosh peeling, but haven't rebuilt or replaced fuel tanks 7 6.54%
Slosh used, no evidence of peeling, but had slosh removed or rebuilt tanks 10 9.35%
Voters: 107. You may not vote on this poll

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  #1  
Old 03-11-2012, 07:29 PM
WillyEyeBall's Avatar
WillyEyeBall WillyEyeBall is offline
 
Join Date: Jan 2007
Location: Daleville, AL
Posts: 354
Exclamation Slosh poll

I didn't built my RV-4, but bought it 8 years ago. Going through the builder's log, I found the tanks had been sloshed in 1994 (18 years ago). The week before my conditional inspection, I saw a few white particles for the first time when I drained the gasolator. During the inspection, the A&P found larger and more particles in the gascolator. With a mirror and light, he then found two patches of the peeled slosh in thefuel tanks.
Anyone who has tanks that were sloshed should read these links:
Van's service bulletin: http://www.vansaircraft.com/pdf/sb11-9-13.pdf
http://www.vansairforce.com/communit...ighlight=slosh
http://www.evansaviationproducts.com...ning_slosh.htm
The third paragraph in the evans link- When it does come off, you'll start to see small white particles in your quick drains and gascolator. It could also be red or yellow.
Just another reminder of what it looks like when peeled off.
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  #2  
Old 04-12-2012, 07:24 AM
WillyEyeBall's Avatar
WillyEyeBall WillyEyeBall is offline
 
Join Date: Jan 2007
Location: Daleville, AL
Posts: 354
Unhappy RVs with slosh

There are over 4000 completed RV3,4,&6s, most before 2000. How many of these used slosh in the fuel tanks? We only had 19 responses to the poll from last month. My toy is still down after rebuilding the tanks when it developed an idling/surge problem on the first flights after the tank rebuild. It looked like some of the debris got into the throttle body, and it's being serviced now. If your aircraft has slosh in the tanks, best to diligently continue to check for peeling evidence on the preflights.
Bill McLean
RV-4 slider
Alabama
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  #3  
Old 04-12-2012, 08:59 AM
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JonJay JonJay is offline
 
Join Date: Jan 2007
Location: Battleground
Posts: 4,348
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Quote:
Originally Posted by WillyEyeBall View Post
There are over 4000 completed RV3,4,&6s, most before 2000.
RV-4 slider
Alabama
Hi Bill. Not to be argumentative, but I would bet that most where probably built after 2000, at least for the 6's, which make up the biggest percentage of the fleet. I started mine in 1998, but by the time I was doing my wing tanks the slosh issue had been brought up and people where well aware. I think that skews the numbers a bit.
You still make some very good points. Everyone should visually inspect their tanks to insure they have not been sloshed before it starts to peel and might be too late, even newer models. You never know what a builder may have done.
I am sure someone like Van's has a running record of how many where flying before 2000 and it would be interesting to see. I could be wrong with my assumption.
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  #4  
Old 04-18-2013, 09:26 PM
cmoody cmoody is offline
 
Join Date: Oct 2012
Location: Lusby, MD
Posts: 6
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I just wanted to add myself as another data point on the slosh. I recently finished an early RV6 kit and applied the slosh circa 1991. I had my first flight last October and was aware to keep an eye out. Small flakes indeed started appearing after just a few hours. (I am pretty sure I did not scuff the tanks as I don't think it was called for other than at the proseal seams.) By about 50 hrs flakes were more numerous and bigger and I decided to pull the tanks and have Paul at Weep no More clean them out. Here is a pic of the gascolator screen right after shipping the tanks
On return the tanks looked very good but had slight interference with sealant around the spar since (at least in my case) that was a very tight tolerance fit. After adjusting for that, tanks are back on with no leaks so far and a clear sample cup! I just added myself to the poll.

Chris Moody
N156CM
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  #5  
Old 04-18-2013, 09:43 PM
cmoody cmoody is offline
 
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Location: Lusby, MD
Posts: 6
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trying again to insert the gascolator screen pic...


Chris Moody
N156CM
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  #6  
Old 04-19-2013, 07:06 AM
campi campi is offline
 
Join Date: Jun 2007
Location: Washington, D.C.
Posts: 215
Default Tanks rebuilt here

My 6 was finished in 1997 and was built with slosh. Found the slosh peeling during pre-buy, so we had tanks stripped and resealed. No worries now.

Fernando
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  #7  
Old 04-16-2014, 08:10 AM
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hcccs hcccs is offline
 
Join Date: Apr 2008
Location: Stockholm, Sweden
Posts: 166
Question

Quote:
Originally Posted by WillyEyeBall View Post
There are over 4000 completed RV3,4,&6s, most before 2000. How many of these used slosh in the fuel tanks? We only had 19 responses to the poll from last month. My toy is still down after rebuilding the tanks when it developed an idling/surge problem on the first flights after the tank rebuild. It looked like some of the debris got into the throttle body, and it's being serviced now. If your aircraft has slosh in the tanks, best to diligently continue to check for peeling evidence on the preflights.
Bill McLean
RV-4 slider
Alabama
I inspected my RV4 tanks and found peeling slosh inside. The tanks were built many years ago and haven't yet seen service. I drilled out rivets in one tank to get the back off but I couldn't loosen it and get it off. The Proseal held it firmly in place. How do I get the back off? Would it help with some gentle heat from a heat gun or what?
If I decide to rebuild the tanks how do I get the screw holes to fit those in the wing spar? Any ideas?
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  #8  
Old 04-16-2014, 11:26 AM
Zero4Zulu Zero4Zulu is offline
 
Join Date: Nov 2008
Location: Scio,Oregon
Posts: 299
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Hans, I recently disassembled my fuel tanks to clean out the slosh. I removed the whole rear panel for the best access. After drilling out the rivets I started to use a thin blade to loosen the proseal and soon found it to be very stuck. I knew heat would be the best thing to try but didn't want a flame or heat gun near these used tanks for fear of blowing up... So I heated a piece of steel about 20mm x 40mm and 150mm long just enough to barely start turning blue and layed it on the area where I was going to start prying. Once separation started I moved the steel block along and reheated (with a torch) the block as necessary. This worked very nicely.

For prying, I used a piece of 3/4" alum. angle 3 feet long and cut one side of the angle to taper from the end about 18" back to be shaped like a long wedge and pushed it in behind the back panel from each end of the tank. As I was prying the rear panel off I added small C clamps to hold it away from the ribs and kept heating my block moving to where I wanted to pry. Each tank took about 1/2 an hour to remove the panel after the rivets were removed.

I found a chemical stripping company locally hear in Oregon to strip every thing out of my tanks. I didn't want brain damage from all that MEK it would take to remove the slosh.
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  #9  
Old 04-16-2014, 11:42 AM
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Mel Mel is offline
 
Join Date: Mar 2005
Location: Dallas area
Posts: 11,271
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Much easier to simply cut holes in baffle and install inspection plates.
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EAA Flight Advisor/Tech Counselor, Friend of the RV-1
Recipient of Tony Bingelis Award and Wright Brothers Master Pilot Award
USAF Vet, High School E-LSA Project Mentor.
RV-6 Flying since 1993 (sold)
<rvmel(at)icloud.com>
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  #10  
Old 04-16-2014, 12:09 PM
wilddog wilddog is offline
 
Join Date: Feb 2008
Location: va.
Posts: 682
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I sent my tanks to Paul at Weeps No More. He takes the baffle off after removing the rivets by letting solvent sit on the baffle side overnight to dissolve the Proseal. His work and service are excellent. Kept me updated with emails and pictures of the process, and the inside of the tanks are spotless and everything was done ahead of schedule. i tried cleaning one section of one tank myself by going in through the plate on the inboard side?. that was enough for me. A very unpleasant job but worse is the difficulty inspecting the interior to be sure all the slosh was removed. Actually I doubt it is possible to get it all without removing the baffle.
Bill
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