Intrigued?

batman1

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• Jun 26, 2022

• #1

I’m intrigued to know what the skinny little black o-ring is for that comes with a airhead oil filter kit?

 

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DrFarkoff

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• Jun 26, 2022

• #2

Depends if you have an Oil cooler fitted

 

batman1

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No oil cooler on my bike, so does that fit under the oil cooler take-off casting?

Thanks Doc

 

DrFarkoff

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• Jun 26, 2022

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batman1 said:

No oil cooler on my bike, so does that fit under the oil cooler take-off casting?

Thanks Doc

Click to expand...

Yes basically seals the filter so the oil goes out the port and back in via the other port rather than bypassing by taking a shortcut

its just beside part 14 in the diagram

https://www.realoem.com/bmw/enUS/showparts?id=0427-EUR-03-1982-2474-BMW-R_100_RS&diagId=11_1756

 

batman1

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• Jun 26, 2022

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Much obliged Doc!

 

dogshome

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• Jun 29, 2022

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In the pic, where is the $1,000 O ring and shim? Or is that gasket a new fangled bit of kit with something built-in?

 

tuftywhite

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• Jun 29, 2022

• #7

dogshome said:

In the pic, where is the $1,000 O ring and shim? Or is that gasket a new fangled bit of kit with something built-in?

Click to expand...

It's the one sitting on the gasket that you can't quite make out. Mentioned in some books (e.g. Haynes) as a white O ring, however, they all seem to be black now.

 

Gelandestrasse

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• Jun 29, 2022

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dogshome said:

the $1,000 O ring

Click to expand...

I'd make that a £2000 o-ring.... price for new big ends and mains and everything else you might replace at the same time.

I once fitted a white o-ring (new) that was ø3.5mm section - I thought it was the correct one, being in my oil filter spares box and being the absolutely correct major dimensions. After 20 miles I realised I had an oil leak - a serious one! I shut down and got recovered home. I bought a new oil filter change kit and found the o-ring was ø4mm in section. No leaks after that. I measure them all now, whatever colour they are!