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left manifold only overheating

shellman

New member
Left manifold is 30 to 40 degrees hotter than right manifold. Left manifold will reach 220 - 230 degrees. It has plenty of water coming thru the hoses. I have changed thermostat. I have dropped lower unit and looked for obstructions and found none. I have taken manifold off. everything looks clean. Has approx. 300 hrs on boat. Any ideas? Should I replace manifold?
 
Welcome aboard !

When off check the flappers. I bet one melted off and maybe blocking that side.

We don't know what make and hp motor. And drive system would help.
 
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