350 MAG temp issue

[saaristo]

I was checking my engine after a day on the water and back in the marina discovered an odd temperature difference on the block halves. Its a 2005 350 MAG. Now I don't actually know what is the difference in degrees if any, but what I'm sure of is that the ~1/2" hoses coming from either side of the block drains (hose from block drain to the bigger hose just infront of the engine which leads to distribution housing) that one of them was hot probably like 160 f whereas the other side was cold as in sea temperature. Is this normal or have I a blockage in the drain or block halve? How do you release the hose, it has some sort of grey tab on it, do you push or pull it?

 

[dubs283]

Squeeze grey tab and pull hose end off of block drain fitting. Water should stream out with decent pressure at first. Lessening as the water level in block decreases

If no water is initially present upon hose removal, probe the drain fitting with a stiff wire. A short, bent piece of a coat hanger ought to work. Once any debris is clear the water should flow out normal

It's a good practice to perform this task for surely during winterize but also once or twice a season to keep things flowing nice

 

[Scott Danforth]

your block drain hose in the single-point crack your block drain system is plugged with sediment.

dubs has you pointed in the right direction. I personally would remove the single point drain system.

 

[saaristo]

Thanks for the tip! I think it isn't actually single point drain system as there are several of those blue fittings - on the distribution housing, on tstat housing, two on the sea water pump. But that probably doesn't matter since the waterflow has to be present on both of these block hoses and when engine running both of them have to be hot, correct?