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200 hp 2000 johnson overheating

Lot of things to try. Remove the pee'er fitting center lower cowl with a 13/16 box end wrench. Start...is water gushing out? If not, look for a bad water pump installation, missed the water tube, WP to water tube grommets not sealing...etc.
If it is gushing water, then I would look to see if it actually IS OVERHEATING. Hold your hand on the upper head for at least 4-5 secs before it gets too uncomfortable. If you can do this, it is not overheating. Use a digital temp gun on the heads to measure temps at various spots. Should be running about 140.

If not overheating, debug the temp senders that are kicking the warning falsely.

If truly overheating, remove the t-stats completely. Run it with the t-stat covers OFF. Water should gush out each side. Run with t-stat covers on, no stats inside. Should run colder than 140.

All kinds of stuff to do. Post your results of these FREE TESTS.
 
I did all those test the water is gushing from pee fitting and t-stats at the top. It is actually overheating. Could it be caused from the missing exhaust housing.
 
What do you mean, "missing exhaust housing"? How can that be? You have the LU re-installed? What is the part that you say is missing? Is this a saltwater motor?
 
Oh...I see. I doubt that would cause overheat. The outer ex housing will get plenty hot, tho. If you have the LU off again, attach a water hose to the bottom of the water tube. Easy to do with a piece of clear vinyl tube, hose fitting (female end), and a hose clamp. Hook it to the water tube and see if water flows very freely, and if it overheats. Another thought, is this on muffs? If so, you need to run it in a tank or in the river. The muffs can and do introduce air bubbles that collect up at the top of the block, causing overheat.
 
Hi Guys. Could this not be swelling of the deflectors or water dams in the water passages of the powerhead, preventing proper water circulation? I'm not sure if a 13 year old motor would suffer from this, but in my 30 year old motor this was the cause of my overheat issues.

In addition the motor could have silt/sand or other residue in the water passages in the head constricting water flow.

you may not be able to see this unless you take off the heads......If all else fails.....

Be carefull doing this as the bolts can be rusted and break causing a whole lot of additional issues.
 
Keithm18 said:
Hi Guys. Could this not be swelling of the deflectors or water dams in the water passages of the powerhead, preventing proper water circulation?
Click to expand...
This motor doesn't have water deflectors that you are speaking of. It has plastic "pins", one on one side, and two on the other side, that do the deflecting. This is not the same as an old crossflow with the rubber deflectors that can distort.
 
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