agmerlin Posted June 30, 2013 Share Posted June 30, 2013 Help! I'm trying to work out what the union sizes are on the 3HW oil tank? I need to know what it should be for the breather on the top of the tank and also the sizes of the pipe unions that join the pipes to the bottom of the tank. I suspect that at some point mine has had different unions fitted because the new filter union outlet union does fit the existing pipe union. Andy Quote Link to comment Share on other sites More sharing options...
wdbikemad Posted June 30, 2013 Share Posted June 30, 2013 Should be BSP, but also maybe Whitworth.....? Quote Link to comment Share on other sites More sharing options...
Ron Posted July 1, 2013 Share Posted July 1, 2013 (edited) Not sure what you mean by pipe unions for the oil lines? The Triumph oil pipes are just pushed onto tube spigots with ferrules to keep the rubber pipes tight. The breather on top has an acorn nut (I guess 1/4 BSP) and a thin pipe 3/16" OD that is poked in the hole at the top of saddle tube......Helps to stop the frame rusting from the inside out!! Pictures shown are a 5SW, But they're all about the same. Threaded unions would be post war I guess? Ron Edited July 1, 2013 by Ron after thought Quote Link to comment Share on other sites More sharing options...
Stefano Posted July 1, 2013 Share Posted July 1, 2013 You've probably got a postwar oil filter on there. Instead of the feed pipe slipping over the filter exit (as on Ron's bike) the postwar bikes had a filter that ended in a threaded union (BSP) with a nut and spigot on the pipe - it made it easier to clean the filter. On the return line however all should be exactly the same as pictured Quote Link to comment Share on other sites More sharing options...
Ron Posted July 1, 2013 Share Posted July 1, 2013 Stefano. I think the post war modification is for the better! The Triumph oil pipes are always a sod to remove/replace. The nuts will be 1/4 BSP. and the solder on nipples for 5/16 copper tube. All available here:- http://www.vintagecarparts.co.uk/categories/vintage-car-parts-taps-pipe-and-fittings-fittings Ron Quote Link to comment Share on other sites More sharing options...
agmerlin Posted July 2, 2013 Author Share Posted July 2, 2013 Thanks for the help guys, it looks like Stefano is right in that the pipes on the bottom of the tank have been modified to accept unions. Can't really tell if they are recent mods or if they were done many years ago. If you zoom in on the attached photo you will see what I mean. many thanks Andy Quote Link to comment Share on other sites More sharing options...
agmerlin Posted July 2, 2013 Author Share Posted July 2, 2013 One thing I forgot to say was that when I took the main union out of the tank, the filter had obviously been broken off at some point. Hopefully it's not still in the tank :-( Andy Quote Link to comment Share on other sites More sharing options...
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