I need to replace the water pump on my 69 johnson 6hp. I opened the lower unit, and of course, I've got to release the shifter rod. I've got a repair manual which is supposed to include the "69", but the instructions are vague as to how to release the lower half from the motor. I do see two clamps on the rod, which may release the upper half from the lower half. I assume the drive shaft will just come out. I am affraid that if I release the rod at the clamp, I will never get it back together. Removal of the power head looks like a bear. Some of those bolts are really hidden. Any suggestions??