Why is oil dripping from the countershaft sprocket cover?
This can go two ways: If you’re lucky, it’s just chain lube that got flung off onto the cover and is dripping out. If you’re not lucky, you got an overtightened chain, and the countershaft seal is shot. This seal is under pressure, so you can lose oil quickly if it goes. It’s not too hard to replace, if you want to do it yourself. You can either drive a sheet metal screw into either side of the seal and pull it out, or remove the sprocket, start the engine and put it in gear. The oil pressure will drive out the seal, so be ready! There is an O-ring behind the seal, but don’t pull it off unless you have a new one. When driving on the new seal, be aware that the case does NOT have a shoulder. Don’t overdrive the seal; stop when it becomes flush with the case.
