Hello everyone, To remind you, it's a 1965 B40F. Having fitted my NOS clutch cable, I went for a quick run out this morning, just a couple of miles. The clutch seemed okay. When I got back, I put the bike on its sidestand and had a peep underneath to see what was happening regarding any oil leaking. The photo shows what I saw.
I think (my colour vision is very poor, but I got my wife to have a look also) the oil you can see has an orange hue about it, which tells me it's come from the gearbox (where I put the dye.) The vertical surface beneath the layshaft bush is not visible, but I ran my finger along that surface about 15 mins after parking up, and it felt dry, but I guess any oil, being warm, might simply have run off it by then (should have checked sooner.) But as the bike is on its sidestand wouldn't oil still be coming from there if that was the source of the leak?
You'll see a large drip of oil hanging in the foreground of the pic, so quite a way from the bush, and also on the horizontal surface, along the line of what I think is a casting seam. It is also on the horizontal surface out of sight in the foreground. The vertical surface (facing us) where I had the dribbles before felt a bit oily, that's all. As you can see, the drain plug looks fairly dry.
I know we've discussed this before, but can I just recap, and check where the gearbox oil could be coming from (yes, I know, the gearbox.) Am I right in saying it must be from one or more of the following?:
- the seal behind the clutch;
- the layshaft bush;
- the drain plug.
Any other possibilities?
Thanks as always, Phil.
