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  #1  
Old 03-25-2021, 06:34 PM
Tracer 10 Tracer 10 is offline
 
Join Date: Mar 2011
Location: Oregon
Posts: 141
Default Usher Fuel Cap O-Rings?

RV6 Kit completed in 1994 and has Usher Fuel Caps with Black O-Rings. Does anyone have the AN Or MS number for these O-Rings?
VANS Parts Website says they are no longer available and to buy new fuel caps.
They may not be currently manufactured, although Ill bet they can be found with a little sleuthing on the internet.
Thanks for you help.
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  #2  
Old 03-25-2021, 06:38 PM
Radioflyer Radioflyer is offline
 
Join Date: Nov 2009
Location: Boston
Posts: 164
Default

Usher does have a website and a parts list from which you can order. Don't have it handy, but google something like "usher machining" or "manufacturing". Also, I think acs sells the oRings.
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  #3  
Old 03-25-2021, 07:11 PM
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Funguy Funguy is offline
 
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Location: Toronto, ON
Posts: 102
Default ACS

ACS: https://www.aircraftspruce.com/catal..._flushCaps.php

There is a diagram at the bottom of the page with all the part numbers.

Cheers, Sean
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  #4  
Old 03-26-2021, 12:42 AM
dcl dcl is offline
 
Join Date: Mar 2012
Location: UK
Posts: 43
Default O rings

https://www.aircraftspruce.com/catal...s/05-02146.php
https://www.aircraftspruce.com/catal...s/05-02147.php
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  #5  
Old 03-26-2021, 07:59 PM
Tracer 10 Tracer 10 is offline
 
Join Date: Mar 2011
Location: Oregon
Posts: 141
Default From Vans Aircraft Website.

Two styles of O-rings have been supplied in RV kits. They are not interchangeable. They are easily identified by color: older O-rings are black, newer ones are brown. The brown O-rings are generally auto fuel resistant, but their tolerance for the newer oxygenated auto fuels is unknown. The older (black) O-rings are no longer available. Upgrading to the newer O-rings requires replacing the fuel cap. New fuel caps with brown O-rings are available and fit all thereceptacles installed in the tanks.
The O-Rings now provided by VANS, Aircraft Spruce are the newer Viton O-Rings and Vans clearly states that they are not compatible with older Usher Fuel Caps.
Thus my dilemma and question about the AN or MS Number for the original Black O-Rings.
Thanks.
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  #6  
Old 03-27-2021, 06:43 AM
BillL BillL is offline
 
Join Date: Sep 2007
Location: Central IL
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Quote:
Originally Posted by Radioflyer View Post
Usher does have a website and a parts list from which you can order. Don't have it handy, but google something like "usher machining" or "manufacturing". Also, I think acs sells the oRings.
Here is the contact page for Usher.

They can certainly tell you if it is a dimensional difference or design difference that the new o-rings won't fit.

You can download the parts diagram for the later caps it has the part numbers.

Please post what you find. And use Krytox 205 for lubricant.

Click image for larger version

Name:	UD-3 Fuel Cap copy.pdf
Views:	13
Size:	1.97 MB
ID:	10484
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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.

Last edited by BillL : 04-16-2021 at 04:35 PM.
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  #7  
Old 03-27-2021, 11:07 AM
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pjc pjc is offline
 
Join Date: Apr 2012
Location: Tampa, FL
Posts: 199
Default

Quote:
Originally Posted by Tracer 10 View Post
RV6 Kit completed in 1994 and has Usher Fuel Caps with Black O-Rings. Does anyone have the AN Or MS number for these O-Rings?
VANS Parts Website says they are no longer available and to buy new fuel caps.
They may not be currently manufactured, although I’ll bet they can be found with a little sleuthing on the internet.
Thanks for you help.
They are Std oring size 326

I bought Viton replacements here:
https://www.oringsandmore.com/viton-fkm-black-o-rings/

If your particular about MS or AN specs, you can pay a little more and get (BUNA not Viton) here:
https://www.aircraftspruce.com/catal...AN6227B-29.php

And I strongly endorse Bill’s suggestion to lubricate with Krytox. Stuff’s not cheap, but you don’t need much.

Peter
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Last edited by pjc : 03-27-2021 at 11:10 AM.
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  #8  
Old 03-30-2021, 10:20 PM
Tracer 10 Tracer 10 is offline
 
Join Date: Mar 2011
Location: Oregon
Posts: 141
Default Thanks for the information.

I really appreciate finding what actual p/ns are for older usher fuel caps.
Thank You.
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A&P: I pay double dues (it's worth it)
Restored L2-M; flown 7 years & sold.
Flying Oregon RV-6
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  #9  
Old 03-31-2021, 08:51 PM
Tracer 10 Tracer 10 is offline
 
Join Date: Mar 2011
Location: Oregon
Posts: 141
Default Small diameter O-Ring for center shaft on Early Usher Fuel Cap.

Quote:
Originally Posted by Tracer 10 View Post
I really appreciate finding what actual p/ns are for older usher fuel caps.
Thank You.
Peter,
Since you came up with the part number and source of supply for the large O-Ring. Any chance you have the part number for the small center shaft O-Ring?
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CW4 (Retired) U.S. Army
A&P: I pay double dues (it's worth it)
Restored L2-M; flown 7 years & sold.
Flying Oregon RV-6
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  #10  
Old 03-31-2021, 09:25 PM
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pjc pjc is offline
 
Join Date: Apr 2012
Location: Tampa, FL
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Quote:
Originally Posted by Tracer 10 View Post
Peter,
Since you came up with the part number and source of supply for the large O-Ring. Any chance you have the part number for the small center shaft O-Ring?
The small one is size 011. (Same size as used in the fuel drains typically).

Also available at oringsandmore.com (in BUNA or Viton).

Peter
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Last edited by pjc : 03-31-2021 at 09:28 PM.
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