No Water Out

[magnogreato]

I have a 2.5L Mercruiser I/O and runs fine in driveway...problem is when I connect the muff for cooling I'm getting no water out of the exhaust (?) port telling me that
I have a clogged cooling system? Maybe? I don't know. I do know that some water is getting partially thru because I have a small, slow leak at keel tube under the motor. The temp goes up to 120 slowly then obviously jumps to 160 and climbs...anyone have any thoughts on this. Caveat....boat has been out of water and in my driveway for two years but engine runs fine, but that doesn't solve my problem. No water out in Neutral or Drive....Help and thanks!

 

[Chris1956]

You should repost this in the I.O section and add the year of the motor. A lot of those motors had some sort of fresh water cooling, where the block and sometimes the manifold had antifreeze cooling it, and a water/water heat exchanger. You should advise on what you have.