Changed water pump for my 1st time V-6 Merc 200 EFI, no water flow. Most likely thing I got wrong?
I installed a water pump kit for my first time on a 1996 Merc 200 EFI. Before installing the kit, for the past 14 months since I bought the boat water flowed just fine. I'm mechanically inclined, but obviously got something wrong. I ran the engine on water muffs, which I have done many times before. I was waiting for the peeing to start and it seemed like it was taking a long time. Then the overheat alarm went off so I shut it down. I know the alarm was not a lack of oil because this engine was converted to pre-mix with the block off kit long before I bought it.
What is the most likely thing or things I could have gotten wrong that it will not flow water? Knowing that in advance may help me in taking the water pump assembly apart to diagnose it. I was certain I got the key in the right place. I rotated the drive shaft clockwise as I slowly pushed the pump housing on to the impeller. I followed the steps in my shop manual verbatim.