I found this in the garage the other day..I expect my antiques to leak a little oil, but not one of my Visions! There was oil all over the place, so much that I couldn't find the source. I cleaned it all up, took it for a short ride, and saw even more oil leaking, this must have just started.
I tracked it down to behind the front sprocket cover, there are only 2 things behind that cover that could leak, the gear indicator switch or the output shaft seal. Only one way to find out. To get that cover off takes some doing, you have to remove some body parts, the mufflers, the head pipes, the floor board, it's a job. Getting the sprocket off was fun, it took a 48mm socket, impact gun, and a gear puller but I won.
The leak is from the transmission output shaft seal, it appears that it just plain fell apart from age and partially slipped out of the case, I found the rubber and the spring parts rattling around on the shaft, with no seal the oil just poured out. I was concerned about the bearing behind the seal being the cause since there is no way to change that without engine tear down which I probably wouldn't bother with on an engine this old but as far as I can tell the bearings are fine, nothing I could do caused any roughness or play in that shaft, only the seal is bad. Fingers will be crossed when I get it all back together though....
A new seal, new shaft sleeve and O ring are on order, conveniently enough I already have a new belt and rear sprocket, I'll change them since I have it all apart. The front sprocket appears to be fine, it's steel vs the aluminum rear one and they don't seem to wear much at all. I will have to address something that I found, one of the mufflers has a hole in in, rusted and cracked around the inlet pipe, I'll change it if I can find one, if not I'll probably just weld it back together, the damage was behind the clamp and fell apart when I removed the clamp.


I tracked it down to behind the front sprocket cover, there are only 2 things behind that cover that could leak, the gear indicator switch or the output shaft seal. Only one way to find out. To get that cover off takes some doing, you have to remove some body parts, the mufflers, the head pipes, the floor board, it's a job. Getting the sprocket off was fun, it took a 48mm socket, impact gun, and a gear puller but I won.



The leak is from the transmission output shaft seal, it appears that it just plain fell apart from age and partially slipped out of the case, I found the rubber and the spring parts rattling around on the shaft, with no seal the oil just poured out. I was concerned about the bearing behind the seal being the cause since there is no way to change that without engine tear down which I probably wouldn't bother with on an engine this old but as far as I can tell the bearings are fine, nothing I could do caused any roughness or play in that shaft, only the seal is bad. Fingers will be crossed when I get it all back together though....




A new seal, new shaft sleeve and O ring are on order, conveniently enough I already have a new belt and rear sprocket, I'll change them since I have it all apart. The front sprocket appears to be fine, it's steel vs the aluminum rear one and they don't seem to wear much at all. I will have to address something that I found, one of the mufflers has a hole in in, rusted and cracked around the inlet pipe, I'll change it if I can find one, if not I'll probably just weld it back together, the damage was behind the clamp and fell apart when I removed the clamp.