Water hose O Ring?

[colb]

Found a weeping water hose connection at the bottom of the coolant expansion tank
https://www.realoem.com/bmw/enUS/showpa ... Id=17_0249

Question is Is there a O ring inside the fitting at the end of the hose and if there is what size is it?
O ring not shown in OEM parts listing, is it included in a new hose?

Would like to just put a new O ring in as the pipe itself still in good order. I do have a set of assorted O Rings but holding off taking it apart to see if I have one that fits, would rather have bought a replacement O ring from BMW if they had listed it.

[patriot66]

Hi Colb. I fitted a new radiator last year and from memory and this photo there were no o-rings fitted on the bottom or top hose connection, so must be inside the hose fitting itself. No idea what size though

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[patriot66]

None on the male fittings on the bracket that locates in the bottom of the expansion tank either

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[Z4Mariner]

Hi Colb, yes, there is an O-ring in the hose fitting, and I don't THINK it is sold separately by BMW. I couldn't find a listing on RealOEM or with two reliable US vendors.

I wish you well . . . O-rings should be so simple, but the combinations of size and material can be really frustrating.

[smorris_12]

I bought a box of assorted O-rings on a whim thinking it would come in useful for the many and varied things I do.

Nope.

Out of a couple of dozen attempts to find a replacement in this box, I think I've managed one. The only other instant win was when I was machining something that needed an O-ring so got to dimension its groove accordingly.

Bloody things. Grr.

[bunk58]

I've just put a new expansion tank on and replaced a few hose connector o rings.
Previously I'd bought this https://www.screwfix.com/p/hilka-pro-cr ... -pcs/27385 .
I'm pretty sure it was the R18 size on the main hoses.

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[colb]

Had another look today not the O ring leaking small crack in tank runs down onto hose fitting will be putting a replacement in after holiday

[bunk58]

Exactly what happened to me, I was convinced it was leaking from the hose connector towards the bottom of the tank, but when it was hot I managed to look up and see the faintest trail of water from about half way up the expansion tank on the nearside.
Good luck with the swap.

[colb]

Exactly the same as you bunk58, once warmed up I spotted a thin trickle of coolant comming down the side of the tank and dropping on the lower hose connector which had misled me into thinking it was the O ring in the quick connect that was failing.
I can confirm O Ring R18 in those kits of O rings fits in the quick connect on that lower hose.

[bunk58]

As I already had the o rings I thought I'd replace them.The old ones weren't leaking but looked a little flat compared to the new ones, also if they new ones leaked it's a quick job to swap them over.

[colb]

Pack of 10 22 x 3.5 Nitrile O-Rings here for £2.30 then you won't be left with a box full of rings you will never use.
https://www.turbonoz.co.uk/metric/TNTORNIT22X3D5.html

[bunk58]

That may help other but, I have already committed to the future usefulness of all those 400 o rings

[smorris_12]

That's the box I've got; probably had it 15 years. I've thrown more away when I can't be arsed to put them back in the box than I've found jobs for!!

[bunk58]

The reality is most of them will never be used but it's a sort of comfort blanket, knowing I have them means I'll never need them.

[smorris_12]

I occasionally feel I should bin the lot to save my blood pressure and just buy ones when I need them, but I'm an optimist. I wonder if these boxes are put together by o-ring manufacturers from all the left overs they make but never sell to industry?!!