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2001 150 saltwater overheating

R

rocken

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"My 2001 Mercury Saltwater ser

"My 2001 Mercury Saltwater series 150 overheats when running 1/2 to 3/4 throttle. It will run wide open around 210 degrees, but no warning horn. Horn sounds around 220. I have changed the water pump, the 2 thermostats, the poppit valve. I have flushed the system with Lime away thru a inline flush, I have flushed with Salt Water Terminator. All lines have been blown thru. It seems as though it gets enought water as the tattle tale's flow is strong. My next step would be pulling the heads to rod out. Can I get by reusing the head gaskets or should I get new ones before I start ? Anything else I'm forgetting. Engine is running strong, no missing no detination, plugs all look as if they are running cool and soot free. I'm looking for any clues, last bit of hair leaving my head as I try to figure this one out."
 
"Rock, for the cost of it &#40

"Rock, for the cost of it (about 20 bucks a side) you should have them on hand. It's tough to save them no matter how careful you are.

And besides, you don't want to pull the head, wreck the gasket and then find out they are on 2 month back order or something along that line
"
 
"I'm off to get a few head

"I'm off to get a few head gaskets. If anyone can think of anything else to try, let me know."
 
"OK, I pulled the left head. I

"OK, I pulled the left head. It looks good no excessive build up of anykind, no mud, nothing...I'm electing not to pull the right head as of yet. Should I go ahead and split the head further? I don't see any evidence that would suggest any build up or corrosion anywhere. It seems something is plugged or I have a bad pressure regulator(poppit valve) from the factory. My few strands of hair are in danger. Any ideas will be greatly accepted."
 
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