Seeking replacement gas cap o-ring seals

[TravelVeteran]

I was told i should replace these blue o-ring seals annually.  Anyone know where to buy them?  My A&P said there's someone on this forum that sells them.

Shaw Aero Devices Part number: 457-1015-12 ?? Not sure exactly.  Tried contacting them with no luck.

1965 MOONEY M-20C
MARK 21
N5673Q
SN 3035
TYPE CERT 2A3
PROD CERT 201

[jaylw314]

Here you go

 

[DonMuncy]

It is my understanding that the gas cap O-rings must be inspected yearly. Most A&Ps just replace them, as the cost to inspect makes the O-ring cost miniscule. However, the blue ones last FAR longer than one year.

[Ragsf15e]

57 minutes ago, TravelVeteran said:

I was told i should replace these blue o-ring seals annually.  Anyone know where to buy them?  My A&P said there's someone on this forum that sells them.

Shaw Aero Devices Part number: 457-1015-12 ?? Not sure exactly.  Tried contacting them with no luck.

1965 MOONEY M-20C
MARK 21
N5673Q
SN 3035
TYPE CERT 2A3
PROD CERT 201

The other place I’ve got them (the original black ones) is lasar.  They generally have the old version in stock.  Lasar in California, they are an msc.

[LANCECASPER]

1 hour ago, TravelVeteran said:

I was told i should replace these blue o-ring seals annually.  Anyone know where to buy them?  My A&P said there's someone on this forum that sells them.

Shaw Aero Devices Part number: 457-1015-12 ?? Not sure exactly.  Tried contacting them with no luck.

1965 MOONEY M-20C
MARK 21
N5673Q
SN 3035
TYPE CERT 2A3
PROD CERT 201

The blue ones are the best. They need a visual inspection and if there are no cracks there's no reason to replace. When I was using the black ones I replaced them every year. Either of them are cheap enough that if it makes you feel better, replace them every year.

[TravelVeteran]

1 minute ago, LANCECASPER said:

The blue ones are the best. They need a visual inspection and if there are no cracks there's no reason to replace. When I was using the black ones I replaced them every year. Either of them are cheap enough that if it makes you feel better, replace them every year.

that makes sense.  mine look perfectly fine.  someone told me to clean em and put some vaseline on em. 

[OSUAV8TER]

The Shaw 457 are generally not a serviceable fuel cap from my understanding. You already have a special fluorosilicone ring installed so if it isnt giving you trouble, fly on! 

[LANCECASPER]

Just now, TravelVeteran said:

that makes sense.  mine look perfectly fine.  someone told me to clean em and put some vaseline on em. 

Not sure how petroleum jelly would react with them, you might check with @OSUAV8TER

[Hank]

I got a set from @OSUAV8TERthey almost two years ago. There's no visible aging or cracking, and my newest IA didn't mention them at annual in the spring.

[EricJ]

47 minutes ago, TravelVeteran said:

that makes sense.  mine look perfectly fine.  someone told me to clean em and put some vaseline on em. 

 

45 minutes ago, LANCECASPER said:

Not sure how petroleum jelly would react with them, you might check with @OSUAV8TER

Petrolatum (aka petroleum jelly) is a decent lubricant for most types of O-rings, including buna-n/nitrile, neoprene, and fluorosilicone.   If you disassemble the cap to replace the small o-ring, a healthy slathering of petrolatum in there will help keep things happy.   Likewise smearing some on the large o-ring helps keep it happy.    The petrolatum is also compatible with the fuel should some of it fall in the tank.

https://www.applerubber.com/src/pdf/table-h.pdf

[David Lloyd]

I've got the same 457 caps and could not find the large o-ring.  Not a circular cross section, it might be available from Shaw.  On mine, the large o-ring was in good shape, it was the small o-ring in the center that was leaking.  The small o-rings are standard rings.  Viton is available too.

[Hank]

15 minutes ago, David Lloyd said:

I've got the same 457 caps and could not find the large o-ring.  Not a circular cross section, it might be available from Shaw.  On mine, the large o-ring was in good shape, it was the small o-ring in the center that was leaking.  The small o-rings are standard rings.  Viton is available too.

@OSUAV8TER carries both sizes in blue fluorosilicone, which last much longer than butyl and viton.

[JimB]

On my aircraft there is an Airworthiness Directive 85-24-03 mandating compliance with SB 20-229a and the SB specifies specific PNs for the O-rings, I use those O-rings. PNs MS29513-338 (small center o-ring) and MS29513-010 (outer larger o-ring). I'm sure the blue fluorosilicone are better and last longer 

https://rgl.faa.gov/Regulatory_and_Guidance_Library/rgAD.nsf/AOCADSearch/9C93312CAD9E7AAB86256A4D00490B41?OpenDocument

https://cdn2.hubspot.net/hubfs/4147179/technical_documents/service_bulletins/sbm20-229a.pdf

[Guest]

Those caps appear to be the type used with O&N fuel bladders.  The seals can’t be replaced to my knowledge.

Clarence

Edited November 5, 2020 by M20Doc