Can anyone tell me please is there any other way that is quicker to fill an upright Norton gearbox than doing it through the filler hole and having a cuppa between each miniscule amount or removing the end cover.Thanking you in anticipation. DAVE.
Officially they applied straight SAE 50, identical to the stuff to use in the engine.
Nowadays an SAE80 or SAE90 type is OK but be sure it is of the GL4 type, definitly not of the GL5 type!!!
GL5 will ruin the bronze bushes due to the additives in it.