Is this swing up or standard rudder?
As you did not indicate that you have a swing up or standard rudder, I guess I must answer for both.If a swing-up rudder is in the up or an upward position, I beleive it is very likely for it to run into the outboard propeller. However, this is usually evident to the user, so I don't think you have a swing up rudder.For a standard rudder, it should never come into contact with the propeller, even with the propeller turned towards the rudder and the rudder turned towards the propeller. If it does, then the engine mount is installed incorrectly too close to the rudder or possibly the outboard is incorrectly not centered onto the engine mount and mounted inside toward the rudder.If the later is the case, the fix is simply to move the outboard outside and more centered onto the engine mount board. If the outboard was mounted incorrectly onto the engine mount so that it could be tilted upward without various appendages on the front of the outboard hitting various handles on the engine mount, try turning the outboard so that the appendages on its forward side face off to one side or the other thus preventing them from banging into the outboard motor mount.