Join Date: Oct 2009
Location: Cape Cod
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Re: Help! 2000 Yamaha 9.9 won't pee while running
Most often when this happens, I've found a blocked pee hole (as has been mentioned above). That's the easy fix.
Dropping the lower unit is sometimes a pain, but after you do it once it's not too hard. There is typically a way to disconnect the shift linkage, then if everything isn't too rusted up, loosen the bolts and off it comes. Then doing the impeller, might as well do the whole pump rebuild kit which includes some gaskets, wear items, and other stuff. That part is pretty straight forward. When you put it back on, there's some fussing to make sure the tube which delivers water up to the engine is aligned with a gasket on the pump, and the shift mechanism is reconnected and adjusted correctly. I've done this on 3 different small outboards, and they each have a different way of doing the shift linkage.
If there is a thermostat, that's a good theory on what's wrong. Think about this poor thermostat living in salt water for a few years and gradually corroding away. Much easier to replace than the impeller.
Marina's might do anything based on the skill and experience level of the tech. Might want to suggest they replace the thermostat first, worst case you've got a new thermostat before they do the harder job. Unless everything is frozen together, if I can do a water pump in an hour, I imagine someone who actually knows what they are doing would be faster so this shouldn't cost a fortune.
Parts are relatively cheap by boat bucks standards.