I recently acquired a 1990 Johnson 120 V4 that is running hot at idle and low operating speeds. The previous owner did not replace the impeller, and I'm sure that is the problem. My problem is that I am having some difficulty removing the lower unit. The procedure is straight forward, except where to disengage the shift rod, the manual refers to a retaining clip that I cannot locate. Is it near where the shift cables attach to the shift lever? Also once I disengage it and pull the lower unit, the drive shaft will be attached so I'll need to have the motor up to pull the lower unit off?<br /><br />Thanks for any suggestions or comments.