Bravo 1 Big Block Overheat

[adam_g]

Bravo 1 7.4 L 1995 Sea Ray Open Cooling System
I have a kind of baffling situation. When cruising below 3000 rpm temp is a steady 170. When I get up on plane the temp climbs to 185. The boat never used to go above 170 anytime. I inspected the raw water impeller and the thermostat over the winter. Does anyone have any suggestions before I start tearing everthing apart? The manifolds and risers seem to be warm but not overly hot. I also see some small amount of white smoke (steam) from the exhaust but it is such a small amount it might be what the boat normally produced.

 

[mikey43]

they are going to tell you change raw water impeller every year!!! just a thought.

 

[Docksidemarineservices]

Right on the transom assembly behind the engine is the water supply connection. Remove the two bolts and clean it out. You have a water restriction problem. If your engine is running hot your are defiantly over heating the drive.

 

[adam_g]

Perhaps I misstated the problem. The engine is running hotter than normal. No overheat...yet. I just pulled the hose from the raw water pump to the engine. There seems to be plenty of water at idle.