VansAirForceForums  
Home > VansAirForceForums

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

- Today's Posts | Insert Pics


Go Back   VAF Forums > Main > RV Ongoing Maintenance Issues
Register FAQ Members List Calendar Search Today's Posts Mark Forums Read

Reply
 
Thread Tools Search this Thread Display Modes
  #31  
Old 12-30-2018, 11:17 AM
deek deek is offline
 
Join Date: Mar 2013
Location: Flathead Lake Montana - 8S1
Posts: 334
Default

Quote:
Originally Posted by BillL View Post
Having tried many of the lubes listed herein the easiest was a drop of 100LL every time the cap came off. Grease, EZlube and others washed off after 4-5 flights and back to dropping fuel. So . . .

I did a little research on the solubility of DC-4, DC-2, EZlube, Lubriplate Lithium, and many others in 100LL. All were soluble in gasoline

I finally found a pure PTFE product called Krytox GPL-205. It claimed not to be soluble in gasoline so I cleaned the caps and o-rings then applied the Krytox. Three BB sized balls and worked it around. A tiny smear on the pivot too.

8-9 flights and three fills to tip top and it the operation is still butter smooth. If this works, a small tube will last till TBO.

BTW - a 0.5 OZ tube was over $20, so not the cheap solution but hopefully it is lasting.

I think I need better bait. It's clear many people don't read past the first sentence. With this lube, the cap does not stick and need the press after lifting the tab.
The EZ community has been using Krytox for their fuel cap O-rings and fuel valves for 30+ years. Krytox 205 was originally developed for the cargo bay door hinges on the Space Shuttle Orbiter - it doesn't outgas in the vacuum of space. As stated, crazy expensive but I've been using my tube of Krytox since 1983... and still have some left. I'm now using blue fluorosilicone O-rings; the Krytox is compatible with them per the manufacturer.
__________________
'83 LongEZ - N888EZ 3,671 hours
'89 LimoEZ - N26EZ 686 hours (sold)
A couple of Glasairs and a Lancair 320...
Next: a RV14 need something to build

Last edited by deek : 12-30-2018 at 11:20 AM.
Reply With Quote
  #32  
Old 12-30-2018, 11:37 AM
gasman gasman is offline
 
Join Date: Mar 2007
Location: Sonoma County
Posts: 3,821
Default

Quote:
Originally Posted by skylor View Post
THIS is the best tip in this entire thread. Lift the lever to the vertical unlatched position then while holding the lever in the vertical position, push it straight down "into the gas cap". I tried this for the first time yesterday and it worked like a charm! The cap then comes out of the tank with zero resistance!

Skylor
This works because the cone drops away from the big O ring. If the tab needs to be pushed down, the shaft O ring is dry and holding it from dropping.

The lube problem comes into play when you install the cap and need the O ring to expand and slide up the cone. If it does not slide easily, the pin takes the excess load till it fails. The cap should never be adjusted so tight that you can't lift the tab with your finger.
__________________
VAF #897 Warren Moretti
2019 =VAF= Dues PAID
Reply With Quote
  #33  
Old 01-01-2019, 11:16 AM
SuperCubDriver SuperCubDriver is offline
 
Join Date: Feb 2011
Location: Germany
Posts: 443
Default

Quote:
You probabably know this but I picked up a helpful tip here on the forum. With the lock lever flipped up, push it down . Then rotate/lift the cap out. I use EZ turn and this procedure makes it very easy to remove caps.
Huh...did not know this and tried it today and this really works. Very cool!
__________________
RV-7 flying, IO-375 w. P-Mags, 200RV Prop

RV-8 flying, IO-375, P-Mags, 74RV Prop

Last edited by SuperCubDriver : 01-01-2019 at 11:19 AM.
Reply With Quote
  #34  
Old 01-04-2019, 11:44 PM
mbauer mbauer is offline
 
Join Date: Nov 2015
Location: Nikiski, AK
Posts: 413
Default Thank You!

Just wanted to say thanks to all who posted.

Used LPS2 to clean the "glue" off of the O-rings. Lots of rubbing, once clean, lubed and re-installed. What a difference. The big help was the push the shaft down to help free the o-ring.

Best regards,
Mike Bauer
__________________
Mike Bauer
N999SN 1998 Syd Nelson RV-6 (purchased 2017)
UTC -09:00 Alaska
Reply With Quote
  #35  
Old 01-05-2019, 06:47 AM
BillL BillL is offline
 
Join Date: Sep 2007
Location: Central IL
Posts: 5,516
Default

Quote:
Originally Posted by mbauer View Post
Just wanted to say thanks to all who posted.

Used LPS2 to clean the "glue" off of the O-rings. Lots of rubbing, once clean, lubed and re-installed. What a difference. The big help was the push the shaft down to help free the o-ring.

Best regards,
Mike Bauer
You forgot the Krytox 205. The lubricity is persistent and the shaft does not need to be pushed in because the o-ring slides and drops the lower cone. If you must push the center, it is the first indication that the lubrication has failed.

You started a good thread.
__________________
Bill

RV-7
Lord Kelvin:
“I often say that when you can measure what you are speaking about,
and express it in numbers, you know something about it; but when you
cannot measure it, when you cannot express it in numbers, your knowledge
is of a meager and unsatisfactory kind.”
Reply With Quote
  #36  
Old 01-30-2019, 08:46 AM
mbauer mbauer is offline
 
Join Date: Nov 2015
Location: Nikiski, AK
Posts: 413
Default

Quote:
Originally Posted by BillL View Post
You forgot the Krytox 205. The lubricity is persistent and the shaft does not need to be pushed in because the o-ring slides and drops the lower cone. If you must push the center, it is the first indication that the lubrication has failed.

You started a good thread.
Thank you Bill.

We use Krytox at work, safe around Oxygen use. We use it for lubricating items located near welding oxygen cylinders.

The LPS works great for the gas cap.

Best regards,
Mike Bauer
__________________
Mike Bauer
N999SN 1998 Syd Nelson RV-6 (purchased 2017)
UTC -09:00 Alaska
Reply With Quote
  #37  
Old 01-30-2019, 11:49 AM
RV7A Flyer's Avatar
RV7A Flyer RV7A Flyer is offline
 
Join Date: Jul 2013
Location: US
Posts: 2,251
Default

Quote:
Originally Posted by deek View Post
TI'm now using blue fluorosilicone O-rings; the Krytox is compatible with them per the manufacturer.
Do you have a part number/supplier, or dimensions for these?
__________________
2019 Dues paid!
Reply With Quote
  #38  
Old 01-30-2019, 01:16 PM
RWoodard's Avatar
RWoodard RWoodard is offline
 
Join Date: Jan 2005
Location: Brighton, Colorado
Posts: 393
Default

My fuel caps were a little sticky so I took a few minutes the other day and showed them a little love.

I ordered a small tube of Krytox 205 lube off of Amazon. I bought the $42 tube because I was afraid I would outlive the $20 tube and I was fairly certain I wouldn?t use the 8 ounce $136 tube. I?m very practical this way.

The end result is that I now have very smoooooth gas cap release mechanisms. I?m not sure, but I suspect hitting all the moving parts with a Scotchbrite wheel was as effective as the magical lube.

I?m probably good for another 20 years! Seriously though, this is the kinda stuff that people do who really care about their airplanes. I?ve looked at 3 Christen Eagles, a Pitts S2A, a 7AC, a GCBC Citabria in the last month and I can?t believe how people [don?t] care for their aircraft.

And no, I won?t be selling Chuck?s RV-3!
__________________
Rod Woodard
Brighton, Colorado (CO12)
RV-3 N87CT (Thanks Chuck!)
Glasair 1RG N388DM
RV-3 N99RV sold 01/2000
F1 MkIII empennage?arrived 08/22/2018--collecting dust
Reply With Quote
  #39  
Old 01-30-2019, 02:15 PM
RV6_flyer's Avatar
RV6_flyer RV6_flyer is offline
 
Join Date: Jan 2005
Location: NC25
Posts: 3,508
Default

Quote:
Originally Posted by RWoodard View Post

--- snip ---

I ordered a small tube of Krytox 205 lube off of Amazon. I bought the $42 tube because I was afraid I would outlive the $20 tube and I was fairly certain I wouldn?t use the 8 ounce $136 tube. I?m very practical this way.

--- snip ---

Just looked on Amazon and the 2 Oz $40 tube is out of stock.

Looking for your opinion on how many caps you think the 0.5 Oz $20 tube will do?

How long do you think the cap(s) will go before they need another coat of lube?

I am ready to buy some. Your reason for the 2 oz tube would be the same logic I would use to get it so am asking if the 0.5 oz size may last 20 or 30 years.
__________________
Gary A. Sobek
NC25 RV-6
Flying
3,400+ hours
Where is N157GS
Building RV-8 S/N: 80012

To most people, the sky is the limit.
To those who love aviation, the sky is home.
Reply With Quote
  #40  
Old 01-30-2019, 02:45 PM
gasman gasman is offline
 
Join Date: Mar 2007
Location: Sonoma County
Posts: 3,821
Default

If Krytox 205 lube holds up as well as EZ Turn then yes, it will last 20 years. You are only rubbing on a small film on the "O" rings.
__________________
VAF #897 Warren Moretti
2019 =VAF= Dues PAID
Reply With Quote
Reply


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 09:11 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.