P11 Gas Tank O-ring

elefantrider · Jan 2, 2020

I replace these at a rate of 1 every year. I picked up a thicker one from an early Commando but it is too small. I guess it is difficult to make a rubber o-ring which doesn’t crack and break in today’s atmosphere.

Junglebiker · Jan 2, 2020

Where have you been getting them from?

AgentX · Jan 4, 2020

I got frustrated and used some elastic shock cord tied into a loop when mine broke most recently. (Purchased loose at REI by the foot for outdoor stuff...) So much nicer, IMHO.

mdt-son · Jan 4, 2020

elefantrider said:
I replace these at a rate of 1 every year. I picked up a thicker one from an early Commando but it is too small. I guess it is difficult to make a rubber o-ring which doesn’t crack and break in today’s atmosphere.

Durability shouldn't be a problem if you choose an O-ring made of the proper material. Remember, there is not _one_ type of rubber polymer. Much crap is being made in Asia nowadays.
Be sure to ask for branded O-rings made of EPDM.
https://o-ring.info/en/materials/epdm/

-Knut

elefantrider · Jan 5, 2020

I got my o-rings from the usual suppliers, Waldridge, AMC spares or Andover.
Where can I buy just one or two EPDM o-rings?

mdt-son · Jan 7, 2020

elefantrider said:
Where can I buy just one or two EPDM o-rings?

If an O-ring fixing failed which was sourced from AN, you should complain to them. Maybe they need to review their supplier and the material spec.

There are specialist suppliers of O-rings who will supply any kind of size and quality. I am sorry not being able to name a stateside supplier (I am in Europe). What's the size of the genuine O-ring p/n 027137 which you pictured in #1 I guess? Please state rubber cord diameter and O-ring diameter.

-Knut

vercu · Jan 7, 2020

I use a 110x5. It is a good fit on my P11. I have the standard NBR one which needs also regular replacement. Please report back if the EPDM one works better.

A quick search:
https://www.ebay.com/itm/Dichtring-...hash=item239ccec6b7:m:mrH8K5YC_mkgmKgV6aKG8QA

Peter

mdt-son · Jan 7, 2020

Elefantrider:

You may want to try this supplier: https://www.allorings.com/Metric-O-Ring-Size-Chart

While EPDM has very good strength and UV resistance properties, it doesn't like fuel spills, so if you can't avoid spills (jumping with your P11, are you? ) I would select a fluorelastomer material such as Viton. It's a bit expensive though.

-Knut

P11 Gas Tank O-ring

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