I have an 1992 4.3XL Merc I/O with an Alpha One outdrive. I have drained all of the water from the hoses that connect to the risers and water pump. My question...where is the block drain plug? <br /><br />I read somewhere that all of the water can be drained from a 4.3 Merc with the removal of just one plug? Is that true?<br /><br />Thanks...<br />XF