I have starting breaking down the lower unit on my 87 evinrude 40 hp but i can not get the shifter lose any tips the manual if fuzzy at best. I am new with this motor and would greatly appreciate any advice i could get. The lower unit was making a lower pitched clunking noise while being run and gradually got worse so we towed it in and drained the lower unit. I found pieces of metal so i hope it's the clutch dogs. Is their any thing else i should look for?