I have a 2001 mercury 90hp outboard that will not lock the propeller in forward gear. The engine still rotates the propeller, but with the engine off the propeller should lock in forward. If you rotate the propeller in forward gear there is a load clicking in the lower unit. It will lock in reverse, like it is supposed to. I tried adjusting the shift cable all the way forward, but unfortunately this did not help. The maintenance manual describes how to adjust for this but doesn't specify what the problem is if it doesn't lock into gear. I assume I will have to take the lower unit apart. But would like to get some input into exactly what I am looking for and what part is broken. I am also interested if this a common problem.<br /><br />Thanks for your time