1989 Evinrude 88 SPL

does it feel hot to the touch warm it up and lay ur hand on the head and see how hot it gets may be a bad sensor

 

I'm thinking, you may have a blockage in the head, water passages.

Your motor will never be as hot, as when you first shut it off. The water stops flowing, and the heat has no way of escaping.

If you neeed thermoststs, you surely needed a water pump also, if it's not been changed in at least the past 2 yrs, but from what your describing, it could also be a blockage.

 

There's bypasses that will let it circulate without fully going throughout your heads.

Warm is ok.

 

It shouldn't be squirting water out anywhere, except that peehole and at the exhaust.

Again, when was the pump changed?

 

Everytime you go to start the motor, check the pee holes for mud daubers. They will do you a job in an instant.

 

You've got more than just a normal thermostat. That's one double pain in the butt to replace. Hard to get to area and hard to clean off gasket material, then you've got the outside cover, the middle plastic piece, 2 thermostats, 2 little white poppit valves, and 2 hard to compress springs, and 2 different gaskets and cork seals around each thermostat.

Try tightening the bolts first, around the cover plate. Don't break those 1/4/20 bolts.

If the thermostats were put in correctly, you'll need the heads pulled to visually inspect for a blockage. It's much easier than doing those thermostats.

 

yo check the thermostat, pull it out and look at it, then get a pot of water boiling and throw it in. After a little bit, use some pliers to pull it out and see if it has opened up, if it hasn't, replace it. I am no mechanic by far, but if it isn't the thermostat, gonna have to find the blockage. Probably got crud in it somewhere restrictiong the flow. If not, might want to check the water pump, the impeller might be buggered up. Good luck, hope it is just the thermostat for your sake

 

Gary
I read your thread and I will tell you what it sounds like to me. It sounds like the water impeller has gone bad. Pull off your lower unit. there is a little rubber wheel that should be replaced every couple of years. I had this same thing happen to me a couple of years ago and it was a simple fix. I believe the water impeller was around $25.he other thing I was told to have checked was the sensor. It is possiable that the sensor has gone bad.
good luck gary
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Steve Searl

 

Gary,
I used to take my car thermostats out and put them in a pan of water , and set them on the kitchen stove , heat them up and see if they open up. Worked for my 1949 Ford.

 

Gary I am kinda tired right now but I will get some pictures up of some spots for younto check for heat as the motor is running so we can tell if you have a blockage inside that block. I am like bobpaul you sound like you have some blockage in there. If it were mine I would remove the t-stats and poppet valve and remove the lower unit and run some water straight through that block from the water inlet tube that comes up out of the water pump.

 

Bubba, It's obvious that those that say, remove and test the thermostat, haven't a clue at what a pain it is to get to those t-stats, in that engine.

Guys, be careful of what info you follow.

 

You are right Bob because two of those small bolts you have to take part of the housing off to even access them.