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Impeller?

Twins 57 Fan

By Twins 57 Fan
in Boats & Motors.

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Twins 57 Fan Community Regular

Twins 57 Fan

Posted
Posted

Just had my boat on the water. It was only sputtering out water a little bit when idling or going slow. After I would speed up then steady stream would come out.

Is this an impeller or water pump?

Help!!!

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john.wells Proficient

john.wells

Posted
Posted

It could be the impeller, or also possible restriction in the water jacket. A lot of times, there might be a little bit of weeds or grit where the water spits out, as this tends to be the smallest opening in the system. Take the cover off and follow the tube from the cowling to where it connects to the engine. With the lower unit submerged or with "muffs" on, start the engine and let idle, then pull the tube off from the outlet port of the engine to see if the flow is better. If it is, clean the gunk from the cowling port. If it still just sputters out, you might only have to flush the water jacket. If you flush the jacket and still have poor flow, the culprit is most likely the impeller. When was the last time it was changed?

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john.wells Proficient

john.wells

Posted
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I'm not too terribly familiar with that engine, but if it is like most Mercury's, there is should be a small plug, about the size of the lower unit lube drain plugs, and is marked "flush". It has been awhile, a long while, since I have flushed an outboard so I run the risk of steering you in the wrong direction. On that note, I am sure someone will get the right info to you. However, I believe it is as simple as making sure you have a good water supply at intake on lower unit and running motor with the flush plug removed.

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boatfixer Veteran

boatfixer

Posted
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I would change the impeller without hesitation for no other reason than piece of mind. There is also a thermostat. Did you run the motor long enough to heat all the way up? If not, this could also explain no flow at idle right away. When you rev it up enough it will force the thermostat open. But as I said before, replace the impeller first and lets go from there.

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Valv Grand Master

Valv

Posted
Posted

Replace the impeller before anything happens to motor. $ 20 part that will save $ 2000 motor.

Once you have it apart, you can see if it's the whole pump that needs attention, which will involve getting a kit which cost around $ 50 and includes impeller, new housing, new wear plate, gaskets, woodruff key, etc.

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marine_man Grand Master

marine_man

Posted
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Replace the impeller.. and see how things are looking after that. Bruce mentioned the thermostat as well, which can get gunked up from time to time.. but if you aren't sure when the impeller was last replaced, now is as good of a time as any.

Good Luck!

marine_man

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MuskieJunkie Mentor

MuskieJunkie

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I had a 94 Merc 60 hp and it use to clog a couple of times per year. It was always in the same spot too. The last rubber hose that leads to the indicator (pee) hole. I would undo the 2 hose clamp, take it out and use a coat hanger to reem it out.

Everytime it happened to me it would completely clog, not the symptoms you described. I would change the impeller, especially since you just took ownership and you don't know the history.

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Twins 57 Fan Community Regular

Twins 57 Fan

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I replaced the impeller... Still nothing. I the took off the thermostat and checked it and it was working fine.

Correct me if I am wrong here... The impeller is pumping water in to the motor to cool it off, it is holding on to the water until it reaches 130 degrees and then the thermostat opens up and pees out the hole. Is 130 degrees the running speed for this motor? why wouldn't it want to pee out all the time?

Help!!!

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boatfixer Veteran

boatfixer

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I would verify the engine temp. I use a laser thermometer, you can use thermomelt sticks also. Another simple but not as precise way is feel the top of the block. If you can keep your hand there, it's cooling.

With Mercs with thermostats under normal function, when you first start up you won't see any (or much of) stream until:

1. You increase RPMS forcing the poppit valve open

2. The engine reaches temperature and the thermostat opens.

Basically, the thermostat is keeping water in until it warms up. However, if the rpms increase the popit valve will open to release water pressure in the block.

Some how, verify you are cooling.

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marine_man Grand Master

marine_man

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Well, since you replaced the water pump, and you said you had a good stream at higher rpm's I'd run it this weekend a bit and check the water stream at idle then and see what it's like.

marine_man

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delcecchi Grand Master

delcecchi

Posted
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I think the water for the "telltale" comes from before the thermostat, or there is some bypass. Every motor I have had or seen starts shooting water out as soon as it is started. That is how you can tell the water pump is working. And the water is cold at the beginning.

So if you don't get water out of the telltale then either you messed up the impeller installation somehow, or something is plugged (not unheard of for crud or bugs to get in the little hole), or maybe the tube came loose under the console.

Your car allows some water through the thermostat when closed.

I would think an outboard would do the same. Look at any outboard that starts up on a local lake. you will see.

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