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89 90hp not pumping water right.

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Backchannelmako

Member
My 89 Evinrude 90hp is not pumping water correctly. I changed the impeller first, then the impeller housing. After that failed I used a whole different lower unit. I also removed the thermostat to eliminate that as part of the problem. I am getting water flow from the indicator hose (which I believe tells me the lower unit/impeller is doing its job?) but I am not getting any water through the thermostat or heads. Any ideas what might be causing this or what I should check next? Thanks.
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I'm just getting steam out of the heads and thermostat.
 
Is this a salt water motor ?----Are you running on a hose ?----Are you running with the lower unit properly submerged in water "---Water must be 4 to 6" above the pump for it to operate properly.
 
This is a saltwater motor. I am currently running on hose today but did run it in a barrel before I switched lower units with same result. Does the water comming through indicator hose show me it is pumping water correctly and that something is wrong in the powerhead? Thanks.
 
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