I have a 1998 E200 TXECM that yesterday we were going along at 3600rpms when all of a sudden the engine reved up to 5000rpm and a loud band as if engine came out of water I shut boat down to check and all seemed fine. When I started back up I shifted to forward and nothing happened ans when I tried reverse it started in gear then nothing. Is there a shear pin or cog that will break if you hit something? There is no water in gear case and it doesnt smell burnt. I have pulled case this morning.