Hey all , picked up a 86 or something mercury xd 18 hp . I forgot to turn thevwater on and ran the motor for about 30 seconds with no coolant gonna replace impeller. while removing the lower unit the shift linkage pulled down and the lower unit is in reverse right now . The retaining screw was broken on the clip piece by the carb so I had to melt the plastic to get the shift shafts detached . Got the unit in a vise on the bench and the lower unit is stuck in reverse . Should I be able to shift lower unit into neutral or drive from shaft.? Mechanically inclined but first time working on lower units. Serial number a146168. Any info would help while I order a impeller