Just rebuilt a set of SUs for a 3.5 litre engine. I am familiar with SUs on MGTs & Big Healeys where the jet is sealed with two cork washers. On the Jag the top of the jet is sealed with a cork washer #37 but nothing below. I am finding petrol is leaking out of the adjusting screw jet #34. I know that the cap nut #45 washer has fiber washer to stop this. Does this mean when adjusting the carby mixture you have to put up with this petrol leak? Also no matter how tight I tighten the nut #44 the bearing jet #41 turns when you tighten the cap nut #45, is this normal? Looking at the diagram it appears that the nut #44 doesn’t lock the bearing jet #41 & the bearing jet is only secured by the spring #39?
I’ve used new washers & seals in the rebuild.