O ring size and suitability...

[Bill]

I'm getting an intermittent fault since one end of my Yeti's head breather popped off (after not engaging the clip properly...). When I give that end a wiggle it moves quite freely and there's evidence of a little oil oozing.

A new part is £23 and a few days away in the post so I'm wondering about just replacing the o ring.

My biggest question is whether an o ring bought from a plumbers merchant would be up to the job?? It's the engine end so will get hot.

And the other is the size...





16mm seem right?

[lufbramatt]

Plumbers merchant o ring unlikely to be the right type of rubber for oil resistance and high temps. Loads of fkm or viton rubber o rings on eBay.

[Jakg]

lufbramatt said:

Plumbers merchant o ring unlikely to be the right type of rubber for oil resistance and high temps. Loads of fkm or viton rubber o rings on eBay.

^ this ^

As a temporary measure, maybe, but it won't last.


I've had great success getting O-Rings off eBay for a fraction of the genuine price but you have to be able to measure them exactly with a caliper.

[shtu]

Bill said:

My biggest question is whether an o ring bought from a plumbers merchant would be up to the job?? It's the engine end so will get hot.

Take the old one in to the trade counter and get them to match it. It would do as a stopgap, and also let you know the size. Then order one in a more suitable material.

[Bill]

shtu said:

Take the old one in to the trade counter and get them to match it. It would do as a stopgap, and also let you know the size. Then order one in a more suitable material.

Nothing close there unfortunately, so I'm looking at a trip to GSF or Euro car parts anyway. :/

[Tymb]

As a temporary measure worth trying one of the assorted ‘O’ ring boxes you can get. I picked up a 419 set from Lidl the other day for £3.99 when passing as I remembered I needed a small non critical o-ring on a machine in my shed. Screwfix and Toolstation also do some sets.

[Bill]

Much as I hate it Amazon have a box of 500 that will arrive tomorrow...

And they're nitrile so should be permanent.

[Jakg]

Bill said:

And they're nitrile so should be permanent.

Nitrile is as good with oil / temps as viton/FKM.

[E-bmw]

Bill said:

Much as I hate it Amazon have a box of 500 that will arrive tomorrow...

And they're nitrile so should be permanent.

I bought one of these kits several years ago & it has saved me many times.

I even managed to make a much larger (temporary) "wiper" type seal for our coffee machine (when the reservoir seal failed & was waiting for a replacement) using 3 O-rings with 2 large & 1 smaller to fill the required gap.