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I've done a couple shaft seals with good results. If the shaft is worn you have to replace that too. Usually there's a kit with the shaft, seals, impeller (save for next year) and everything you need. here
Re: Raw Water Pump Leaking Weephole After Replacing Impeller
I have experienced EXACTLY what you are seeing with a 5.0L GXiB. Run engine on hose in driveway, water out the weep hole. Run engine with boat in water, no water out the weep hole. I can't explain it, except to speculate that it may have to do with the pressure of the water delivery. Other people have posted about this same situation. I first noticed the weep two seasons ago. I just keep an eye on it. [links]
I'm not familiar with your engine but sounds like the pump seal is going. There are seals around the shaft that turns the impeller which need to be replaced when the weep hole starts leaking.
I assume you replaced the o-ring for the impeller cover but not the shaft seals.
Re: Raw Water Pump Leaking Weephole After Replacing Impeller here
Re: Broken impeller pieces more
Thanks Sparkieboat
Yeah, you're right about changing more often. It certainly is easy enough, and good insurance. After pulling the foot off, pulling the T-stat and hooking up a hose to the water tube to flush, is the T-stat opening the only place for the pieces, if any, to exit? Same for reverse flushing from the T-stat, is the water tube the only exit? here
Re: Broken impeller pieces
Re: Broken impeller pieces more
Maybe, but you know for me to put it to rest, I'll try your suggestion. And even after that, for at least the next couple of times out, I'll be watching and listening closely for any thing out of the norm. Then and only then will I consider the case closed. And I will be not only inspecting but replacing the impeller every couple of years. more
In the enclosed system, the water that flows through the engine’s water jacket and ports is the fresh water and coolant. The only part the raw water flows through is the heat exchanger. The same scaling occurs however. When water flow is restricted and the engine begins to overheat you may be able to “acid boil” the scale out of the heat exchanger and continue to use it. The worse case is that you would have to replace the heat exchanger. This would be much less expensive than replacing the engine. more
The next inline part of the engine cooling system is the sea strainer. This is a device through which the raw water flows and is designed to filter out debris, sand, leaves, etc. before it gets to the engine. This device works much like a swimming pool skimmer. There are several kinds of strainers but all have a removable filter or screen which should be checked and cleaned or replaced on a regular basis. here
In a raw water system the water is drawn up through the seacock by the water pump. The water flows through the engine and directly out the exhaust. This cooler water absorbs heat from the engine to help keep it cool.
Other components of the cooling system, whether it be raw water or enclosed, are the seacock, sea strainer, hoses and clamps, belts and water pump impeller. more