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Author Topic:   Water Pump ?
huladick posted 10-04-2001 11:14 PM ET (US)   Profile for huladick   Send Email to huladick  
I have '96 Merc 75hp, 2 stroke. The other day when I started it, the water coming out was like it was spitting and not a steady stream. Even sounded like air/water. It then started flowing normal. It's used in salt water, flushed every time and pump was replaced 1.5 years ago. It's done this twice now. Anyone else seen this ?
jimh posted 10-05-2001 09:20 AM ET (US)     Profile for jimh  Send Email to jimh     
The path the water takes before getting to the confidence tube output varies among outboard brands.

Generally in the Mercury engines, the confidence output is attached to the water flow near the end of the circulation path. When the engine is started it takes a few seconds for the water pump to circulate water through the water jacket and to reach the confidence output. In the process is probably also expels any air.

When the engine is started, it is not unusual for the engine to run for 10 seconds or so before the water stream appears at the confidence output.

After the engine has been running and is warm, the temperature of the water in the confidence stream will rise, providing somewhat of a corollary to the engine temperature.

On Yamaha engines, the confidence stream is tapped into the water flow at the start of the path through the powerhead. When these engines are started the stream appears almost immediately, often before the engine actually starts. The temperature of the water coming from the confidence stream remains at lake water temperature, as the water coming out the confidence stream has not passed over the powerhead.

mcahill2 posted 10-06-2001 08:08 AM ET (US)     Profile for mcahill2  Send Email to mcahill2     
Moybe mud dabers they love those pee holes LOL go to a shop with a air comp and blow out you tube to make sure it's clear.,also I change my water pump imp ever 2 year sometimes a year just depends on if the boat has been setting or how ive been running it like low water getting into the sand.Good ins is the next time you replace your pump put a water pre ga on it there great you don't need to always be checking to see if its peeing a good stream. you may also want to ck the cuo or housing that the imp set's in.

ps a coat hanger works great to unplug the pee hole

huladick posted 10-06-2001 08:24 AM ET (US)     Profile for huladick  Send Email to huladick     
Thanks for both replies. Would it hurt to hook up the ear muffs to an air compressor at low psi to try and blow any junk out ? Or do you think this would help at all ? Also, when an impeller goes out, is it a gradual thing or does it just stop working. Seems to be OK now.


Dick M.

mcahill2 posted 10-06-2001 08:37 AM ET (US)     Profile for mcahill2  Send Email to mcahill2     
It could do both with out water they will burn up, I have seen guys pick some trach like and ice bag on the lower unit block the water and there she blows, But most of the time they just wear out. also if they set they will dry rot there just rubber,
you can run the motor and blow at the same time.
ALAN G posted 10-06-2001 06:06 PM ET (US)     Profile for ALAN G  Send Email to ALAN G     
Always interesting to trouble shoot from afar, and take a shot! I am only troubled by your description of spitting air/water. Indeed, it takes time to fill the powerhead before the indicator starts showing water so there could be no problem. Judging on the age of the engine and care, it is not likely to be a head gasket. But if a gasket partially leaks, it will leak high pressure gases from the combustion chamber into the cooling water passages in the engine and you get what seems like air and water. If you have a bad head gasket, it normally would continue to be a problem, especially at higher speeds when the engine is really putting out. My advice would be to run it but keep an eye for any further changes.
Clark Roberts posted 10-07-2001 06:24 AM ET (US)     Profile for Clark Roberts  Send Email to Clark Roberts     
A piece of "weed-eater" string makes a great device for cleaning the "Pee" hole and tube. It won't damage any rubber tubing! Clark

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