O Rings for Shaw Bladder Fuel Caps

[Marauder]

Does anyone know the correct part numbers and where to buy the blue fluorosilicone O rings for the older style Shaw fuel caps?

 

 

 

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[Mooneymite]

"Someone" sent me this....caveat emptor:

 

https://www.amazon.com/gp/product/B0055E1RLM?psc=1&redirect=true&ref_=oh_aui_detailpage_o00_s01

 

[kortopates]

The amazon link is not based on the correct standard, (M25988), and therefore is not really a legal "standard parts" without the proper standard #. Also its just the big one.

Anyway, for the Shaw 431/531 cap you'll need (I am not sure what model that is with the notches around it):

• M25988/1-338 – big o-ring
• M25988/1-010 – small o-ring
• MS24665-298 – cotter

Cheapest I have found them is Skygeek.com - however they show the wrong color but correct standard (image mistake?) http://www.skygeek.com/military-standard-m25988-1-338-o-ring-fluorosilicone-70a.html

0-rings Inc used to have great prices on these, but no longer: https://oringsusa.com/catalog/product_info.php/cPath/21_90_94/products_id/94000338

All have the the small -010, which  is very cheap and also available at Spruce as well as the above two places

Edited July 6, 2017 by kortopates

[carusoam]

See if this is any good...  might be complete fake.

http://www.ebay.com/itm/Complete-O-Ring-Kit-for-Shaw-Aero-431-531-Flush-Fuel-Caps-/131260200460

Makes a great picture.

Best regards,

-a-

[Delta]

O&N Bladders on my M20C have Shaw 457-370 fuel caps.   As far as I can tell, two o-rings are used:

PMA Products CA38241 and Parker MS25913-110.   (Other brands may apply...)

For the CA38241 information, go to PMA Products website, then click on "Other Parts", then Mooney "M20 Series".  Or, here is the link to the PMA Product document:

http://www.pmaproducts.com/supplements/CA38241  

 

 

Edited March 6, 2018 by Delta

[LANCECASPER]

On 7/6/2017 at 11:16 AM, kortopates said:

The amazon link is not based on the correct standard, (M25988), and therefore is not really a legal "standard parts" without the proper standard #. Also its just the big one.

Anyway, for the Shaw 431/531 cap you'll need (I am not sure what model that is with the notches around it):

• M25988/1-338 – big o-ring
• M25988/1-010 – small o-ring
• MS24665-298 – cotter

Cheapest I have found them is Skygeek.com - however they show the wrong color but correct standard (image mistake?) http://www.skygeek.com/military-standard-m25988-1-338-o-ring-fluorosilicone-70a.html

0-rings Inc used to have great prices on these, but no longer: https://oringsusa.com/catalog/product_info.php/cPath/21_90_94/products_id/94000338

All have the the small -010, which  is very cheap and also available at Spruce as well as the above two places

For the 431/531 caps this still seems like the best deal around.   https://www.beechtalk.com/forums/viewtopic.php?f=44&t=130666

[jetdriven]

Those won't fit the mooney bladder fuel caps. I've already done that the hard way. 

[Marauder]

Those won't fit the mooney bladder fuel caps. I've already done that the hard way. 

The Beechtalk ones?


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[jetdriven]

yes the beech fuel capo-rings won't fit. After you cut off the old o-ring is not the time to find out. But 110$ for the o-rings from O&N and 30$ for overnight freight made it alright again 

[Mooneymite]

My bladder (original style) Shaw caps are from 1991....the O rings have never been replaced.  Last time I over-nighted the plane was in a horrendous dowpour...not a drip of water in either sump.

Obviously, nothing lasts forever, but these O rings seem to last well.

[LANCECASPER]

McFarlane has the outer rings for $43.20 each 

https://www.mcfarlaneaviation.com/products/product/CA38241/