1987-1989 Mercruiser 3.7lx drain plug locations

[jrego204]

hey, this is my first boat and I cant seem to find the drain plug locations on it. there is no manual as the previous owner couldn't remember where he placed it. ive looked everywhere online we found one plug under the motor on the left side, I don't know where the other is located any help would be very much appreciated thanks.

 

[nola mike]

What are you trying to drain? To winterize your 3.7, you remove the aft plug on the heat exchanger. Here's a link to the manuals, you want #8

 

[stonyloam]

Yeah there is one block drain on the port side of the engine and another antifreeze drain on the underside of the heat exchanger. There are two drain plugs on the exchanger, the aftmost is raw water the forward one is antifreeze. As Mike asked, what are you trying to do?