I am trying to buy a Bayliner with a volvo penta 2.3ltr engine. The engine does overheat after 10-15 minutes. When I put the motor in gear for forward the prop goes back and forth and sometimes does not engage. The same with reverse. Is it possable for me to take the lower and upper unit apart and replace any worn or broken gears/pieces. Would this be a hard project to do and would this help with the overheating problem?? 