Simple when you know how
Having got the Lowlight Minor up onto axle stands in the shed and removed the seats, carpet, soundproofing and gearbox cover. I was then able to properly investigate the exact source of the oil leak.
As some of you may remember, the gearbox was built up from two different ones, the first being a non-overdrive Morris Marina box, and the second was a Triumph single rail gearbox with a J-type overdrive. Despite ostensibly being from different marques, the Marina box is in fact
