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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Petrol tap corks and Ethanol
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<blockquote data-quote="oexing" data-source="post: 127459" data-attributes="member: 1493"><p>The cone type taps all got same problem: You cannot run same material in itself, brass in brass will seize, like plain steel in plain steel or alu in alu. You´d have to do a mod either by plating one component - the cone here - or find a grease that will last with fuel, so no seizures then. </p><p> I went for ss cone in brass body because I can do it all at home. A great alternative may be hard chroming the cone and lap it afterwards but costs will rocket I guess. </p><p> As to fuel resistant grease I have no idea. Does anybody have a truly long time experience with that kind of stuff and in what application ? </p><p> The typical plain seal/gaskets of fuel taps with two or three holes in the gasket were made from rubber type material which is no longer fuel resistant. I changed them with home made cork gaskets, delicate to do but work allright then, cork has no problem with alcohol, but possibly water and biological life in fuel . </p><p> . Once the seal in those is leaking you can do the cork mod. Big drawback with cork is you´d have to drink several bottles of quality wine or brandy to get suitable corks for making tap seals from them - oh well, you will accept some sacrifes in life and will have done so in the past I guess . . . .</p><p> Coincidentally I had to overhaul both taps on the 1935 Guzzi GTV yesterday for the MOT. The springs in the 1/8" pipe thread taps were very strong so the soft cork was pressed so much till the two cast-in tubes got proud and kept the mating faces apart, leaks then. Made softer springs and new corks so this should do longer than one year as with last corks and hard spring.</p><p></p><p> Vic</p><p></p><p>[ATTACH=full]37239[/ATTACH]</p><p></p><p>[ATTACH=full]37240[/ATTACH]</p><p></p><p>[ATTACH=full]37241[/ATTACH]</p></blockquote><p></p>
[QUOTE="oexing, post: 127459, member: 1493"] The cone type taps all got same problem: You cannot run same material in itself, brass in brass will seize, like plain steel in plain steel or alu in alu. You´d have to do a mod either by plating one component - the cone here - or find a grease that will last with fuel, so no seizures then. I went for ss cone in brass body because I can do it all at home. A great alternative may be hard chroming the cone and lap it afterwards but costs will rocket I guess. As to fuel resistant grease I have no idea. Does anybody have a truly long time experience with that kind of stuff and in what application ? The typical plain seal/gaskets of fuel taps with two or three holes in the gasket were made from rubber type material which is no longer fuel resistant. I changed them with home made cork gaskets, delicate to do but work allright then, cork has no problem with alcohol, but possibly water and biological life in fuel . . Once the seal in those is leaking you can do the cork mod. Big drawback with cork is you´d have to drink several bottles of quality wine or brandy to get suitable corks for making tap seals from them - oh well, you will accept some sacrifes in life and will have done so in the past I guess . . . . Coincidentally I had to overhaul both taps on the 1935 Guzzi GTV yesterday for the MOT. The springs in the 1/8" pipe thread taps were very strong so the soft cork was pressed so much till the two cast-in tubes got proud and kept the mating faces apart, leaks then. Made softer springs and new corks so this should do longer than one year as with last corks and hard spring. Vic [ATTACH type="full"]37239[/ATTACH] [ATTACH type="full"]37240[/ATTACH] [ATTACH type="full"]37241[/ATTACH] [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Petrol tap corks and Ethanol
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