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Mariner 1999 9.9 hp 2 stroke water pump issues

fatblakstax

New member
"Hi, my mariner 9.9, 2 stroke doesnt pump water properly. It does pump some water as it's coming out of the hole at the bottom of the shaft, it just doesnt make it to the outlet.

I have tried changing the impeller, but it didnt seem to make any difference. I have also removed the water jackets And the shaft to check the piping which all seems clear.

The pump itself seems to be in good condition. I just cant work out what it could be.

Any idea's?"
 
"Gaskets and seals on the wate

"Gaskets and seals on the water pump cover especially could be bad. The seal where the water tube enters the cover could be shot.

You could have a hole in the water tube itself (have seen this alot, especially on motors that have been run in salt water),

or, the seal where the water tube meets the base of the powerhead could be bad.

Of course, this is assuming that the intakes are not blocked and the impeller has not slipped off it's key....."
 
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