Home › Forum › Ask A Member › 9.9/15 impeller housing tricks? › Re: 9.9/15 impeller housing tricks?
Well in the process of trying to get things back together, it will be necessary to replace the thermostat gasket, so I am just waiting for the part to come in. My money is that the thermostat was stuck closed. I hooked up my test hose to the water inlet/copper tube and it was gushing through both the tell tale and thermostat orifice once I cleaned everything out.
Pre-teardown, I had some dripping and occasional squirts out the tell tale, and that was even before I replaced the impeller (the original was frozen onto the drive shaft…had to use a grinder to get it off the driveshaft and break it loose). It had two paddles bent backwards permanently and still was somehow pumping a fair amount of water, but obviously was in need of replacement.
My guess being a stuck thermostat (closed), is further supported by the fact that today I was working on a completely separate 9.5 (not a 9.9), and that motor was pumping lots of water but overheating. Shut her down, removed the thermostat, and voila! No more overheating (ran cold of course). So now just waiting for a new thermostat for BOTH motors……
As frank said in the old forums…school of hard knocks. First 2 motors I’ve seen with thermostats which open freely in my hand, but fail to open during operation. Thank god for laser heat thermometers.