cooling problems 35HP '76 Evinrude

[jbond1717]

Have a 1976 35HP Evinrude that I cannot get water pumping through correctly. The water pump has been changed twice (impeller is fine) but I still cannot get water pumping through the system. Is there another possible cause for this?<br /><br />Thanks for your advice.

 

[12Footer]

Re: cooling problems 35HP '76 Evinrude

Yes, there are other causes. First,dont trust the earmuffs. get a garbage can and tank test it.<br />Find the thermostat.These are usually located above the upper spark plug on the head,under a housing secured with screws or a clip (sorta like the ones used on brake fluid resevours on cars).<br />You can remove it, check for flow, and replace it, but DO NOT leave it out for good.<br />Unequal head cooling will result, and that's bad news.<br />Also check the tube inside the poerhead cover going to the tell-tale hole,and look for blockages there.<br />I even had a muddawber build a mud-nest in my intake.<br /><br /><br />------------------<br />I came, I saw, I Have No CLUE!