Hi there, this my first time posting although I have found this forum extremely helpful in restoring my 68 Glastron 177 with Mercruiser 120hp. A few weeks ago I got the boat out and noticed I was over heating, being new to boats I disassembled the entire cooling system and cleaned out all the rust before reassembling. I then removed the lower unit and checked on the water pump which seemed to be in good shape so I put it back together and tried agin only to over heat again. I have since ordered a new water pump but I'm afraid i do not have the right part. I have attached a link to the part I have, will it work, is there anything else that could be causing over heating?
Sierra International 18-3320 Water Pump Kit https://www.amazon.com/dp/B00144D09O/ref=cm_sw_r_cp_api_t8hWxb8HTDQSQ
Sierra International 18-3320 Water Pump Kit https://www.amazon.com/dp/B00144D09O/ref=cm_sw_r_cp_api_t8hWxb8HTDQSQ