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If you have a good hardware supply they should carry graphite impregnated stem packing for faucets. Hi Heat resistance, easy to form and leak proof. Comes in various diameters to make your own rings. Paul B
No, the reason they aren't there is because they have turned to ash and thence to dust and have been blown out and disappeared! Never in the history of exhausts has there been such a stupid idea as trying to seal a joint that will regularly see temperatures upward of 400*C with a nitrile O-ring!Pete
I recently had the exhausts off my LM2 and the 'O' rings had partially disintegrated although there was enough left to seal. I bought some replacements from a bearing/seal supplier. I got 4mm cross section, 36mm ID and they are a perfect fit, I got Viton as they are better with heat than Nitrile, they're only rated to 200 degrees C but Nitrile only to 120 C.I bought a pack of 10 because I know they'll need replacing if I ever remove the pipes again...UK supplier but these are what I bought; https://simplybearings.co.uk/shop/p514223/4mm-Section-36mm-Bore-VITON-Rubber-O-Rings/product_info.html?backstep=1
Quote from: 80CX100 on Today at 04:21:25 AM The model you've given with a cross section size of 4mm definitely looks like a better fit for the recess in the female flange,,, but the 36 mm id would be a tight fit for my 38 mm balance pipe,,, that might be a good thing.>
The model you've given with a cross section size of 4mm definitely looks like a better fit for the recess in the female flange,,, but the 36 mm id would be a tight fit for my 38 mm balance pipe,,, that might be a good thing.
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It is a good thing, if they were bigger I doubt you'd get the balance pipe into the flange. Mine are tight and need a little lubrication to go in, the 'O' ring is a nice snug fit on the pipe and the end of the pipe is lightly tapered to get it in. Then it's a nice tight fit once in.
Of course they'll burn/melt away again due to the heat (as previously mentioned, who would spec an 'O' ring in an exhaust?) but at least it started out in there.
I had to remove my exhausts again a month or so ago as the flange on the (Agostini) header pipe broke off (they really were very poorly welded, plus the right side is not quite in-line so is under tension when fitted) and there was still some 'O' ring left in both sides.
I did previously fit some Nitrile 'O' rings (the first time the flange broke off) and they had completely disappeared when the flange broke again.
Slightly O/T but (in case you're interested) the first time the header flange broke off it left a 'jagged' edge which I rewelded but it didn't hold so the next time I got some rings laser cut from 2mm steel (originals were 1.5mm) and made a clean repair which seems to be holding up so far but I'm not impressed with the original Agostini welding...