Hello all !!!!

I have a problem with a 1980 OMC 800 stern drive. mounted on a 16 foot
speed boat driven by a 350 Chevy. It stopped shifting foward and
reverse the second time out this year. It worked one time and when
shifting to foward after backing away from the dock it stopped. I am
not sure of all the models but I don't believe it to be a electric
shift. I forgot to put the drive down and put it in gear for a few
seconds, after putting the drive down it wouldn't work again. I don't
know if it is related to that or not?? When I got the boat home with
the engine not runing, I put it in gear and it is harder to turn the
prop but, it doesn't lock up! Any ideas. Thanks

Steve