I need help! 1976 Mercury 200 20 hp, ser # range 441****, mod # 1200506E, No water from tell tale! I checked the water pump and the water tube, they seem to be in good condition. The impeller is a little stiff but still intact. So why i had the lower unit off i hooked the hose to the water tube, some water did come out of the tell tale but most of the water came out of a hole down and to the left of the water tube which seems to be in the bottom of the block. I'm adding pictures to try to help to determine what this hole is. Any help would be appreciated!