Triumphrat

vwbuge · 06-17-2008

I began changing the oil in the Triumph. I changed the primary and gearbox oils at the same time. I came out the next day and there was a puddle of oil about the size of my fist under the bike. I was wondering why the bike was so low on oil when I drained it.

I have determined the leak to be from the gearbox. From what I can see under the bike it is dripping from the front sprocket. I assume it is the gearbox seal leaking behind the sprocket?

Anyone ever had any experience with this? I guess I'll have to tear it down?

('72 Daytona T100R)

OzBloke · 06-17-2008

Yep, probably. It could also be the seal in the cover on the primary case for the gearbox mainshaft, but you shouldn't have put enough oil in the primary to get to that point. Either way, you should replace it when you take the clutch and cover out to get the sprocket off to get to the gearbox seals. There's a large seal, a small seal, an o-ring, and the seal in the primary cover to do, as well as the primary cover gasket. While you're in there, check the clutch plates, springs and push rod over. While you have the sprocket off, also check that the small closed-end roller bearing for the layshaft is not leaking - just forward of the mainshaft.

vwbuge · 06-17-2008

I took a little closer look tonight. So I am assuming I can do this with the motor in the bike? It looks like I can remove the primary cover and the primary chain along with the clutch. From there I can remove the front sprocket and gain access to the gearbox seal.

Is this correct?

OzBloke · 06-18-2008

Exactly correct. Yes. Affirmative. Da. Ja. Yep. Knoath.

It can, and usually is, done with the engine in the frame.

vwbuge · 06-19-2008

Looks like I am going to park the Triumph for the big trip this weekend. I'll use the Ducati instead.

I just ordered $60 worth of gaskets and seals to take care of my leak.