thoughts on johnnyrudes "cooling issues" pair of 28 SPLs

[stevo10081984]

my new problem is a cooling one....i started a post the other day about my other "twin" 1988 evinrude 28 spl not quite heating up to where it should be...anywhere from 80-100 after 45min in a barrel at idle...i was told no big deal seeing as its like 20-30 degrees outside.... however my newly recesitated johnson 28 spl...after just a short few minutes at idle speed and in the same conditions as it sister evinrude the johnson hits anywhere from 140-160 on the water cover plate and it briefly registered as high as 180 on the block....i am going to change the impeller asap, even though it pees steadily, my question is what else should i look into, i think my control box has a overheat alarm how do i check to see if it is functioning....also compression while hot is 102 top 110 bottom...this motor has been sitting for years so in comfident those readings will improve...both cylinders were between 115-120 cold.....also the plate over the t-stat has been removed at some point...and instead of a gasket they used sillycone....so im gonna take that off and clean check t-stat operation and replace gasket...any thoughts on cleaning passage ways or what else i should look for in my endeavors? and just for fun...what would you expect to pay for one of these fresh water motors in clean good running condition, fresh fuel lines carbs and paint

 

[scanman]

Re: thoughts on johnnyrudes "cooling issues" pair of 28 SPLs

Definately check that thermostat & get rid of that sillycone! Also check online to see if you can find the service manual for those motors, 'cause it'll tell ya the correct operatin range for 'em. That'll tell ya which motor is really operatin the best, but I'd think, in those conditions, the cooler motor would be the correct one. Anyway, point is... Find out what they're supposed to be doin before ya try to fix 'em. I'd tell ya what they're worth if I had any idea, but ebay'd be a good startin point, or maybe Craig's List.