2004 Mercury Optimax 150 overheating
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Posted on Sunday Jun 26, 2011 at 8:26 PM  
So when i run between 1500 and 2400 rpm, my Smartcraft sensor overheating alarm goes off. Any other time it runs great, i can run all day once I hit 3000 rpm and the poppet kicks. Just replaced thermostats, poppet valve, and water impeller last year. Do these need replaced again? also my thermostats are 143 degree thermostats, and the temp gauge says it runs at 150 degress? SHould I replace the thermostats again? New water impeller?

Any ideas?

Thanks,

chad
Posted on Sunday Jun 26, 2011 at 11:26 PM  
They changed the plumbing around on that motor if I remember correctly increased the Id on some and didn't increase the flow. You might be hearing a flow alarm. About the only way is to temp check the heads or use a DDT to get a sensor reading. Two things can cause it if it is heat poppet is clogging up or water pump is bad. Aftermarket pumps can also give low flow at low rpms and in a long load situation. Be carefule opti's use temp reading to map oil flow just matters what way the sensor is out of whack if you can be rich or lean. Also the did a recall on some motors and replaced the poppet setup and cover. Would need a serial number to search that. T stat seems a little high off the top of my head I thought it was around 130. I will look in the manual tomorrow and let ya know.
Posted on Monday Jun 27, 2011 at 7:26 AM  
Thanks, Appreciate that.

serial # is The serial number is OT860463 2004 150XL Optimax
Posted on Monday Jun 27, 2011 at 8:02 AM  
Welcome to the fishing-notebook bigcatter54. Hopefully beans can help you get Optimax figured out.
Posted on Monday Jun 27, 2011 at 12:18 PM  
This might help. I had a problem with my OMC getting hot. Replaced the water pump, thermostats, took the bottom off to run pressure hose through block to dislodge possible blockage...well, I started paying closer attention. When I got that thing trimmed up so I could fly my water pressure would drop and it would overheat...not enough lower unit in the water.

Duh...
Posted on Monday Jun 27, 2011 at 3:33 PM  
Beans, based on my serial # could you tell me what thermostats I need.

Thanks,

Chad
Posted on Monday Jun 27, 2011 at 5:17 PM  
Ya I will look it tomorrow for ya
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