hot evinrude 110

[jeepster21]

i have an 1988 evinrude 110 hp motor and it keeps over heating. The water pump is very strong and pumps lots of water. But the water that is coming out of the motor is cold all the time even when the over heat alarm is going off and the power head is so hot that the wires start to turn to gell. i took out both thermostats and ran the motor today and the block is still very hot to the touch. is there any thing i am missing? thanks

 

[Mark Charlton]

Re: hot evinrude 110

some sleeves / jackets could be clogged. Someone must have a procedure better than ramming a clothes hanger in there!
Mark

 

[gejandsons]

Re: hot evinrude 110

1989 Evinrude 110 HP - I just went thru the same thing with mine this spring. Overheating with good flow from the tattle tale. I suspected bad t stats & pulled them & checked them. Both ok. cleaned & replaced. Engine still hot after idling a few minutes.
I went to sears & bought a no touch infrared thermometer & found the overheating to be true even with cool water from tattle tell. Found hoses going from head to t-stat housing cool. Removed hose clamp & cracked the seal on both hoses. They both spit out a little steam then water. Resealed them & motor has been cooling good since. Appeared to have been air locked.
Tattle tell means water pump is pumping but not that the engine is cool on '89 110 HP

 

[emdsapmgr]

Re: hot evinrude 110

It is possible that one or both of the two pinholes in the thermostat valve body may be plugged. They are prone to, since they are so small. If they plug up, warm water will not get to the backside of the thermostats to cause them to open, and the engine will overheat at idle and low speeds. You need to disassemble the thermostat housing to check them.

 

[Chinewalker]

Re: hot evinrude 110

On crossflow V4s like yours the telltale water comes from the cooling circuit near the beginning and will never get warm - it hasn't traveled through the motor yet.

I would do what gejandsons did and remove the thermostat end of the cooling hoses. Start the motor and see if you're getting flow that far. If the water gets through everything and makes it to the heads, then the motor should be cooling to that point. A LOT of water should come out the hoses, not a dribble and no steam.

A lesson I learned on my 90hp was to make sure the tiny passage in the top of the waterpump housing, between the cup and housing where the large o-ring sits sandwiched between them, is free of sealant. I was a little overzealous with the sealant on mine and it would lose prime at anything above idle speeds. Mine would pump at idle and stay warm, not hot. I would get the boat moving and shortly after I brought it on step it would start to overheat. Drove me nuts before we figured it out...

- Scott

 

[jeepster21]

Re: hot evinrude 110

ok i pulled the t stats out and the springs that go with them and on the end of the springs there were these white plastic paddle things that were all melted. After I pulled the t stats out i put it back together and ran the motor the stream of water coming out has lots of pressure and is now warm so it seems to be cooling better, but the motor still feels hot. i went and bought a digital thermometer what should the temp be when fully warmed up? Thanks

 

[ob]

Re: hot evinrude 110

External head cover and block temps above 163 F are cause for concern.

 

[walleyehed]

Re: hot evinrude 110

Rotten, smashed, missing water deflecters in the cylinders need to be in good shape for the water to follow the path it should as well.

 

[Ken K]

Re: hot evinrude 110

You mentioned testing the thermostats. Can you explain that procedure?
Thanks for your help.

Ken K

 

[ezeke]

Re: hot evinrude 110

You can test the vernatherms in a pan of water, using a kitchen meat thermometer. The vernatherms should open at 140 degrees, indicated by the pin moving outward.

Walleyehed's mention of the water passage deflectors is significant; look into it first if you have uneven cooling of the cylinders.

 

[emdsapmgr]

Re: hot evinrude 110

Another old post got resurrected.

 

[Ken K]

Re: hot evinrude 110

You can test the vernatherms in a pan of water, using a kitchen meat thermometer. The vernatherms should open at 140 degrees, indicated by the pin moving outward.

Walleyehed's mention of the water passage deflectors is significant; look into it first if you have uneven cooling of the cylinders.

Thank you for your reply. I will check it out. Also, the new hoses I installed from the thermostat cover to the cylinder heads are slightly kinked. Is that ok or will that restrict water flow?