Looking for a cooling diagram for a '95 502MPI. My stbrd exhuast is getting hotter than the port. Little bit of steam coming out after a hard run until the system cools back off. Port side has a little steam, but hardly noticeable. I've got IMCO powerflows on this motor. Been on there for 10 yrs now in fresh water. Probably time to take them off and inspect again.

Every Merc engine I have ever seen has a hotter starboard manifold than the port side. As long as it isn't burning the flappers or the paint off I just ignore it.
You could put a restrictor in the port manifold hose if you want them even.
As for your question about a diagram, a quick google will bring it up.

Bravo drive? I would check to make sure the water supply hose fitting isn't starting to close up (bravoitis).

https://www.mercruiserparts.com/502-...-8-1993-1995-1

Grab a workshop manual, the diagram and other pertinent info. is contained therein.

https://www.mercruiserparts.com/bam/.../31924/2342/16
So I am a Gen 6 502 open cooling and this is the diagram that looks like my setup even though it is a 454. My question is what is the direction of flow?

My guess is:
1. out of the bottom port on the seapump
2. Into and out of the fuel cooler
3. Into the stat housing
4. if the stat is closed then out the exhaust
5. If the stat opens then into the engine.

So all the water pump on the engine does is draw water out of the block and back into the stat housing where it is either recirculated or dumped out the exhaust??

The bottom port of the pump is the inlet on a standard rotation engine. Path is pump > fuel cooler (MPI) > oil cooler > stat housing >

Closed stat - fills block/bypasses out to the exhaust until warmed up.

Open stat - water goes from stat to circulation pump, parallel flow through the block and heads and out the thermostat to the exhaust (some water is still bypassed to the exhaust).

The circulation pump helps to evenly distribute water throughout the block and head. The bypass line between the intake (under the thermostat) and the circulation pump keeps things moving (evens out temp in the block) until the stat opens. Once the stat opens, water is constantly moving into and out of the engine.

If considering a bypass system to replace the circulation pump, you may want to tie in the front and rear intake coolant passages on each side to prevent hot spots at the back of the engine (keep the circulation pump - no reason to remove it really).

Nope I see no reason to remove the engine water pump I was just curious for my own information. Thank you.