Re: 1968 mercury 500 50 hp no water from pee hole!! my first boat
First off I would put in a new impeller anyway, they get "set" when sitting for long periods, make sure the impeller is located with the key on the driveshaft. If the lower unit is off, do this, connect a cut off garden hose to the copper tube in the exaust housing that goes up to the powerhead making sure to tighten it down with a small hose clamp, now cut on the water and let it run awhile. You should see a real good pee stream but let this run for awhile to flush any deposits out of the water passages in the powerhead. You can also reverse flush it too by pulling loose the pee hole hose and temporarily connecting the garden hose here too and flush it out good. If everything is good here then you might have pieces of an old rotten impeller blocking the intake to the impeller, you'll have to remove the impeller and wear plate to inspect this area, hold lower unit upside down and shake to see if anything comes out, sometimes little pieces make their way into the copper tube as well, check this out too...let us know your findings..........
