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1988 Evinrude 28 SPL over heating

M

Middlekid

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New water pump, thermostat pumping lots of water. Appears no blockages. Witts end. Could leaky head gasket or too lean gas mix cause overheating? Runs fine until the warning. Owned for 7 years never needed to touch the engine.
 
Yes, checked in a pan of water. Opening at 143. Tried running without but still overheating. Opened the power head found two pieces of rubber hose in the water jacket around the cylinders....told they're supposed to be in there...water directional. Also a piece of rubber looks like maybe a piece of impeller. Never had an impeller come apart as long as I have owned. I'll put the hoses back and try again with the piece of rubber out.
 
There should be 3 pieces of rubber tubing in the water jacket.----They need to be there to guide water around for proper cooling.
 
That's what i've been told. In the process of ordering. If that doesn't fix the problem will have to take off the engine block to check for any other foreign debris. After that I'm out of ideas.
Thanks for your reply.
 
Back to the over heat discusstion....only two tubuler diverters but another piece of rubber that appeared to be flat but a closer look shows it was tubuler 1" long but smashed flat. Not sure but only location for it could be at the top of the upper cylinder. In that location it would line up directly in line with the thermostat housing when the head is replaced. The schematic does not show a third diverter in that location. So, Racerone, you are probably right...should be three.
 
Not probably right!-----The parts book clearly shows 2 of one length and one of another.----And I have more than one of these blocks on the shelf.----Get this right or consult your local expert for help !
 
Middlekid said:
New water pump, thermostat pumping lots of water. Appears no blockages. Witts end. Could leaky head gasket or too lean gas mix cause overheating? Runs fine until the warning. Owned for 7 years never needed to touch the engine.
Click to expand...
Did you actually check temperature with an infrared temp gun.?
 
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