I can't see how I've helped - that is only the owner manual, I can't find a free copy of the shop manual.
The only way I can help would be to go through this as a repair thread, which means we have to start out with pictures of the machine, the engine installation, the oil leak, etc.
At present the only way I can see a front crankshaft seal oil leak resulting in oil smoke, is if it makes the PTO clutch slip and get hot, so the clutch itself smokes and burns the oil, or just maybe if the oil gets on the muffler, but that has a heat shield and the outside of it should not really be hot enough to burn oil.
The radiator cooling fan and PTO clutch for the cutting deck drive are on the radiator end of the engine, at the front of the tractor. The magneto is on the back or flywheel end of the engine, in amongst the belt drive to the camshaft. That is also where the propeller shaft to the rear drive transmission attaches to the center of the flywheel. That tractor is laid out like a real tractor, or a rear drive car - it is not built like a ride-on. As a result, it is a very heavy machine, and lasts for a very long time, plus or minus regular blow-ups of both the PTO clutch and the wheel-drive clutch. As I said before, I suspect its ancestry is in Honda's car division, not its portable engine division. It must have been horribly expensive to manufacture.
We need to see where the oil is going and where the smoke is coming from: whether it is smoking from the front of the engine, or from the engine exhaust. If the clutch is slipping and smoking, it should be all blackened and covered with oily carbon.
