I recently had the need to replace the brass tubes which screw into the aluminium head that the water hoses connect on to. It was discovered that the thread on this head was 1″ x 24 TPI,
Brian Marshall pointed out that he had heads with 20 TPI threads so check carefully before embarking on cleaning out threads, making or purchasing new tubes.
I had great difficulty in purchasing a 1″ x 24 TPI as I needed to tap the thread deeper in one of the holes (not the through hole) in order to give me a better thread into which I could fit the new tube I had made, as the upper portion of thread was almost stripped when the old tube was removed.
Well I purchased a tap & would like to make it available to any Scott owners club members that have the same need as I had. Please feel free to contact me if you need a loan of this non standard tap.
regards Keith Parker
Brass in aluminium — BAD idea! The brass, (in fact the copper in the brass), and aluminium are too far apart on the galvanic scale and the aluminium, being the more reactive, will be the one to suffer.
Make the tube out of wrought aluminium or stainless steel it’ll be a lot safer and kinder to your cylinder head and maybe preserve the last of your threads.
Dissimular metals + water – a whole area of research in its own right!