how do you get the lower unit off this motor, I need to change the pump impeller, I've taken the four bolts out of the lower unit and it drops down about 2inch. but it look like shifting linkage rod, is holding it from coming the rest of the way off, how do you unhook this rod, or does it just pull out of the lower unit?? you can E mail me at esmith14886@netzero.com with any help Thank ES