Interesting thread. Old Ferguson tractors have lots of bronze in the gearbox / hydraulic system and we were warned decades ago not to use certain oils as they attacked the bronze. And so I didn’t, nor did I ever use those oils in my motorcycle gearboxes. Yet not so long ago on this forum, some were expounding the virtues of gear oil and chiding us for not using it in our motorcycle gearboxes, almost suggesting those of us who follow makers recommendation and use engine oil were some sort of retard. Where are these guys now?
your quote on ferguson tractors is correct, i see many failures due to people using modern 15w40 engine oils in tea20 ferguson tractors.
the oil question will be my next task as my rebuild is coming along well. tinware is primed, engine barrels machined, working on the sludge trap and timing bush now.
only have pistons plus small end bushes to order now. some chrome and zinc plating and i will be happily tinkering away.
new valves, guides and springs are on the bench. im not doing a 100mph rebuild but im a fussy old bugger and like things to be done right.
ive tried posting pictures but they are too big to post! need to get a teenager to fix that,
my rebuild will slow down for a while as harvest time is near and i will be burning the midnight oil keeping machinery moving.
dave