Englishmaninwales Posted January 19, 2022 Share Posted January 19, 2022 I'm looking for the correct size o rings for the oil pick up. Note this is the later type bell tank Rover K with a lower pick up fitted through a threaded shoulder on the base of the tank.My notes (not sure where I originally got the information, possibly from this forum) say this should be Viton 1.78mm section x 17.17mm bore, but despite care and lubrication they chew up on fitting.Before I order more/smaller o rings to try (expensive), any info would be useful.ThanksMalcolm(I should add these are obsolete parts for CC parts, although they are looking into it for me). Link to comment Share on other sites More sharing options...
TomB Posted January 19, 2022 Share Posted January 19, 2022 I cant help with your query, but I didn't know the later tanks had this large casting and the oil pick up exposed like that. Whats that all about? Link to comment Share on other sites More sharing options...
Wrightpayne Posted January 19, 2022 Share Posted January 19, 2022 Malcolm,I posted the sizes a while ago when I fitted mine. Let me search! Ian Link to comment Share on other sites More sharing options...
Wrightpayne Posted January 19, 2022 Share Posted January 19, 2022 Here it is....https://www.caterhamlotus7.club/forum/techtalk/k-series-dry-sump-bell-tank-o-rings Link to comment Share on other sites More sharing options...
Englishmaninwales Posted January 19, 2022 Author Share Posted January 19, 2022 Thanks Ian, I think that must be where I got the o ring size from. What's the trick for fitting them, as I've shredded 2 pairs now on trial build, despite using plenty of lubricant?The opening has a 0.45 mm machined step which takes the opening down from 20.8 to 19.9mm, which I think is doing the damage.Malcolm Link to comment Share on other sites More sharing options...
Wrightpayne Posted January 19, 2022 Share Posted January 19, 2022 I experienced exactly the same. I used a 6mm ball shaped cutter in the dremel and carefully blended the edge of the lip. Link to comment Share on other sites More sharing options...
Englishmaninwales Posted January 19, 2022 Author Share Posted January 19, 2022 Thanks Ian blending that edge is the way to go! Link to comment Share on other sites More sharing options...
Wrightpayne Posted January 19, 2022 Share Posted January 19, 2022 (First pic is blended) Link to comment Share on other sites More sharing options...
PROBE2 Posted January 19, 2022 Share Posted January 19, 2022 If it helps this is the part number from Titan for the O ringsSRN-200-017-45-A4 Paul Link to comment Share on other sites More sharing options...
Englishmaninwales Posted January 20, 2022 Author Share Posted January 20, 2022 Thanks Paul, that's most helpful.Malcolm Link to comment Share on other sites More sharing options...
Englishmaninwales Posted January 20, 2022 Author Share Posted January 20, 2022 For future reference: The o ring size for this application is correct as posted by Ian in his link and repeated above.Titan part number SRN-200-017-45-A4 is for a 200-017-4470 o ring. Trelleborg make this o ring 17.16mm ID 1.78mm cross-section in Nitrile.Simply Bearings sell a Viton version (higher temp/oil and fuel resistant) 17.17 x 1.78 mm part number BS017.VIT Link to comment Share on other sites More sharing options...
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