Quote Originally Posted by Hogster1 View Post
Gotta agree with Kaz here.If you have ever replaced an impeller you will notice how the housing is made it will drain dry as soon as the lower unit leaves the water and is trimmed down. Wouldn't take but one spin and the fins would dry it completely like a squeegy and then possibly score the impeller.Maybe not but i wouldnt advise it
Thank you for pointing out that water pumps are made to drain out. I reckon I didn't consider that. I have replaced my impeller on my 07 yamaha 90, and didn't notice where the intake and outlet were located, but this makes sense.
so here's my question, if all the water drains out of the pump, the damn thing is dry EVERY time you start up. does it stand to reason that when you first crank the motor, it would take a few turns before water reaches the pump? If memory serves me right, the impeller in my yammer is a good 2-3 inches above the water level when my boat is afloat, and probably 9-10 inches above the water pickup on the lower unit. it usually takes 2-3 seconds after my motor is started for it to start peeing. I wonder how many times the impeller turns before it picks up water? especially one that hasn't been changed in years?
I'm for sure not trying to start any arguments here. I have always been told not to ever crank an outboard dry, and for the most part I see why. but then again, I know a guy that will crank his old eveinrude 50 until it fires before they ever leave home. completly dry. and he does this every time they take the boat out just to be sure its gonna start. to make matters worse, hes one of these guys who cranks it again at the boat ramp until it starts, then dead revvs the thing real good to "warm it up". he has had the boat for about 25 years and bought it new and not had a lick of trouble with it other than a broken sparkplug wire. (he does replace the impeller every few years) I am not saying I agree with this, just that this is how he does it and his old boat still runs right along side of my new one.