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Overheating mercury 200 hp

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cjacobs17

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I have a 2003 200hp mercury ca

I have a 2003 200hp mercury carberated motor. I just had it rebuilt due to overheating. It is still overheating especially after new water pump. replaced seals in midsection as well. Mechanic said there was a water flow interuption under the boat. Took off strainer it did not overheat for him. I took it out and it overheated again. Mechanic is authorized mercury dealer. Any leads
 
"Hi there,

Is it getting en

"Hi there,

Is it getting enough oil?

Why did you initially re-build it? What was the cause of failure? Could be that the original cause was never recified...

Have you tried running it on muffs for a while to see if the overheat issue persists?

Keep us posted.

Regards,

Benjamin."
 
The motor overheated and creat

The motor overheated and created a hole in the cyl. on the top starboard side. The mech. said that he replaced a gasket in the mid section that was blown out as well. That was the suspect in the initial failure. On muffs I was told it was good by the mech. Under load is the issue. it seems to overheat faster at higher RPM. I have place 2 gal. of oil in the 90 gal tank. The fuel filters have been replaced (water separater and on engine). The mech.came by today and put a plate that is designed to add water preasure to the intake. I took the boat out today and it overheated again. I limped back to the dock and removed the plugs on a hunch. 2 of 6 were normal. 2 of 6 had oil residue on them 1 of 6 had some fouling/carbon on it 1 was bent in. The plugs should only have 3 or so hours (new at rebuild). Please respond with suggestions. CIJ
 
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Bent plug is usually death. I do not know about overheating, but a holed piston is from the pinging. Whaterver ign. switch box or module is bad."
 
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