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Possible Water Pump Problem 1975 99Hp Evinrude

O

optsyeagle

Regular Contributor
"I took my motor out of the la

"I took my motor out of the lake for winter storage this weekend. I was inspecting the outside of it and noticed that inside the water exit holes just above the cavitation plate is a small piece of black rubber material.

I am guessing that this may be part of an impeller fin but I am not sure.

My questions are this:

1) Could pieces of an impeller fin make it that far through the water circulation system or is it more likely that this is some other piece of the cooling system?
2) I acquired this engine this year and do not know when the impeller was last changed. Would you change the impeller alone or do a water pump rebuild with one of the kits.
3) Would it be best to wait and do this work in the spring just before I put it in the water or does it matter if this new impeller/water pump sits in winter storage for 6 months or so?
4) How is the best way to get this material out of the water circulation system?

The engine never overheated. When I was running it to spray some engine fog into it, I felt the engine head just after it shut off and was just barely touchable as it usually was. I really appreciate any help I can get. I have never changed a water pump before."
 
"IMHO pieces of the impeller c

"IMHO pieces of the impeller can move throughout the circulation of the engine. The passageways are ultimately very small, especially the water pick-up tube. Unless the piece is very small, I doubt that it could go through the engine like that. However, if you just acquired the engine, why not replace the pump anyway for the peace of mind. The kit comes with everything, including seals, o-rings, etc. I always buy the kit because of that. Otherwise, you could dissasemble and if the impeller housing isn't scored or damaged, you could re-use it. Nice project to complete right before season, if things are slow, so that you are ready to go come spring."
 
"I agree with Sleeper--rebuild

"I agree with Sleeper--rebuild the pump--
this forces you to remove the lower unit and allows you inspect it for foreign debris. The impellor should be changed often, generally based on how many hours you use the motor, some say once a year. You will also need to change the lower unit lube and you can do all this as the
same time. I dont think that the kit includes the water tube grommet, but you may need one of those also. This may be what you are seeing since the grommet is outside the housing that covers the impellor. Only one way to find out!"
 
"If it was an old gasket, wher

"If it was an old gasket, where would the old gasket come from? Also, any idea how to flush this material out. Perhaps there is more that hasn't made it all the way to the exit holes."
 
"Again: by rebuilding the pump

"Again: by rebuilding the pump, you are required to seperate major sections of the motor and this gives you access to areas that can be cleaned out. I am guessing about that particular motor, but if you have a small plate attached to the exhaust housing at about the half-way point, this is the place that gives you access to the coupler that seperates your shifter--once this is disconnceted, the lower unit drops down, pulling the drive shaft out of the powerhead--it gives you accesss to the water pump--when I rebuilt my motor I also removed the thermostat and cylinder head and ran water and compressed air through the channels--I also used several different size gun cleaning brushes to clean the scale out of all the openings I could see."
 
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