Boat Runs Hot when going above 3000rpms, please help

[LevIsak]

i have a 95 maxum 2300 sc , 5.0l alpha1 gen 2,

boat seems to idle fine and cruises fine and great temperature till i reach about 3200rpms then she starts to climb in temp from 160 to close to about 200

what can it be, impeller is new , carb is good, thermostat is new

please help

 

[dubs283]

Re: Boat Runs Hot when going above 3000rpms, please help

when impeller was replaced was it complete water pump assembly, including gaskets?

 

[P 0 P E Y E]

Re: Boat Runs Hot when going above 3000rpms, please help

Close to 200 is not too bad considering 180 is close to 200

Does the temp go all they way up?

Does the engine actually overheat?

 

[Don S]

Re: Boat Runs Hot when going above 3000rpms, please help

Has it or does it get used in salt water? Could be plugged manifolds and risers.

As dubs mentioned, new impeller plus old gaskets could cause an overheat. Sucking air. When on plane, the raw water pump is out of the water.
Have a look at this Mercruiser Service bulletin from 95. It's still true today.

Service Bulletin 95-13

 

[LevIsak]

Re: Boat Runs Hot when going above 3000rpms, please help

the gaskets were changed too, iv already put in about $2500 in to her we still cant figure it out, i leave the trim all the way down.

 

[Don S]

Re: Boat Runs Hot when going above 3000rpms, please help

i leave the trim all the way down.

Then trim it up............. You are plowing through the water, trim it up and get on plane.
Find someone to teach you how to use the trim.

 

[P 0 P E Y E]

Re: Boat Runs Hot when going above 3000rpms, please help

If you spent $2500, was it on labor? If you spent it on labor, then the mechanic owes you some change if the problem is not fixed.

Have you told hime the problem is not fixed?