I recently replaced the thermostat and water pump. The engine overheats at idle but anything above idle is fine. What did I do wrong?
I recently replaced the thermostat and water pump. The engine overheats at idle but anything above idle is fine. What did I do wrong?
Did it do that before you replaced the thermostat and water pump? How is it pissing at idle?
It did not. Pissing strong at all times.
Is it possible that you have the blades of the new impeller twisted the wrong way?
Ephesians 2 : 8-9
Charles Barkley: Nobody doesn't like meat.
That’s certainly possible. I guess I can reverse it and see what happens.
OEM thermostat? Some of that aftermarket stuff does not fair well especially with Yamaha. If it’s pissing strong it shouldn’t be the impeller imo, as water is flowing i.e. the impeller is spinning and creating positive head pressure. My guess is the thermostat or temp sensor. In case you still want to see if the impeller is aligned correctly don’t just reverse it as you may have it correct. Spin the motor with the lower unit off. The impeller fins should be aligned in the opposite direction as the direction the drive shaft spins.
Last edited by cam1195; 12-04-2019 at 02:06 PM.
1) what was it doing before you installed new parts?
2) drop your thermostat in hot water to make sure it's working
3)Just because it's peeing strong doesn't mean you don't have a blockage in the powerhead. To eliminate the water pump from the equation, hook your garden hose up straight the watet pick up tube in the midsection and report back whether that fixes the problem or not.
Last edited by tman; 12-04-2019 at 02:19 PM.
"Hunt today to kill tomorrow." - Ron Jolly
Shit, don't sound like a problem to me, just cut the damn thing off at idle. I wish my boat problems were that simple.
..
Don't rule out bad temp sensor....shoot each of the three holes with a laser gun to see what the temps are. Will also isolate the blockage if there is one.
If it is a salt water motor, you would be amazed at what the cooling passages can look like even if flushed religiously. The coolant passages on my f250s actually corroded all the way through and I was getting peanut butter in my chocolate on both of them.
[SIGPIC][/SIGPIC]
Delta in a nutshell: Breeding grounds + small wetlands + big blocks of grass cover + predator removal + nesting structures + enough money to do the job= plenty of ducks to keep everyone smiling!
"For those that will fight for it...FREEDOM...has a flavor the protected shall never know."
-L/Cpl Edwin L. "Tim" Craft
Thanks for the replies. I’ll try a few things and report back.
We had a 250 corrode through the block and started shooting raw water into the flywheel, it didn't like that for some reason.
The marina guys swore they were rinsing the motor and that you didn't have to so far up the river....
OP, is it alarming or water gets hot or both? Do you have temp gun? Shoot block to find blockage?
Was the old impeller really beat up and could be a piece stuck somewhere?
My yami 2 stroke would overheat when slow trolling for kings- it was the poppet valve- does your motor have one?
its a water pressure problem if idle only,
if it didn't do it before your work.....drop it down and look at the impeller,
plate underneath it, O-rings, alignment tube, etc,
If that doesn't work, take the thermostat out of it and see what it does and get back to us.
Coming back to this. From the diagram, it does not look like it has a poppet valve. I am going to try some of these suggestions today and report back.
Poppet valve is built into the thermostat on the smaller engines
Bookmarks