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Overheating starboard side and can't figure out why?

<h1 style="box-sizing: border-box; padding: 0px; margin: 0.67em 0px; visibility: visible; line-height: 1.1; font-family: Tahoma, Arial, "Roboto Regular", "Helvetica Neue", Geneva, "Lucida Grande", Verdana, sans-serif; color: rgb(51, 51, 51);"><font size="3"> 1993 Johnson 115 hp VJ115TLES</font></h1>Cylinder 1&3 overheating. Overheating alarm working and #1 cylinder is in fact way to hot.<br><br>I have had the cylinder heads off several times and all looks good inside the water jacket. The rubber deflectors are as they should be.<br><br>I have taken off head covers and they appear good.<br><br>New head gaskets sealed and torqued per service manual instructions.<br><br>No sign of gasket leaking cylinder pressure into water jacket. Checked heads and block with straight edge.<br><br>Checked water pump housing, impeller, seals, tubing connect o ring, gasket seal under pump. All seems correct.<br><br>Went through thermostat housing replaced thermostat and inspected all components and all seamed as they should be.<br><br><br>Does anyone have idea of what could be the cause? Am I missing something?<br><br>Or is this a inherent problem with this engine?<br> <br>I am at a loss. <img src="images/smilies/confused.png" border="0" alt="" title="Confused" smilieid="10" class="inlineimg"><img src="images/smilies/confused.png" border="0" alt="" title="Confused" smilieid="10" class="inlineimg"><img src="images/smilies/confused.png" border="0" alt="" title="Confused" smilieid="10" class="inlineimg"><br><br><br><br><br><br>
 
Don't know where all the computer code came from but I removed it.


1993 Johnson 115 hp VJ115TLES



Cylinder 1 &3 overheating. Overheating alarm working and #1 cylinder is in fact way to hot.


I have had the cylinder head off several times and all looks good inside the water jacket. The rubber deflectors are as they should be.


I have taken off head covers and they appear good.


New head gaskets sealed and torqued per service manual instructions.


No sign of gasket leaking cylinder pressure into water jacket. Checked heads and block with straight edge.


Checked water pump housing, impeller, seals, tubing connect o ring, gasket seal under pump. All seems correct.


Went through thermostat housing replaced thermostat and inspected all components and all seamed as they should be.


Does anyone have idea of what could be the cause? Am I missing something?


Or is this a inherent problem with this engine?


I am at a loss.:confused::confused::confused:
 
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I have a 1990 90 hp. If your thermostat set up is the same, there is a small pinhole in the thermostat gasket that must be clear and open. Did you check your thermostat for that side in a pan of hot water?
 
Just for kicks, put it in the lake and see how it works, and report back what you find.

I will do that but I have had trouble with it overheating while using the boat.

Our boat ramp is in the middle of a no wake zone While having to idle out of this zone is where the alarm goes off.

If I can get to the open water without getting it to hot I can open it up and it usually clears itself to give no more trouble for a unpredictable amount of time.
 
I have a 1990 90 hp. If your thermostat set up is the same, there is a small pinhole in the thermostat gasket that must be clear and open. Did you check your thermostat for that side in a pan of hot water?

I have done that and the thermostat opens as it should.

I am wondering if there could be a partial obstruction in the block where the water comes in from the jacketed exhaust cover and flows to the right bank.

The problem is that I can not get a visual on that passageway.
 
I will do that but I have had trouble with it overheating while using the boat.

Our boat ramp is in the middle of a no wake zone While having to idle out of this zone is where the alarm goes off.

If I can get to the open water without getting it to hot I can open it up and it usually clears itself to give no more trouble for a unpredictable amount of time.

Thanks for that info. So now I don't know where/what the fault is.
 
I see you say that the impeller and pump housing was checked. Have you replaced the water pump recently? Would be the first place I think I would start.
Just throwing it out there.
 
Richard... Riopga is right about that small pinhole....it must be clear. I found a little grain of sand in mine. Clearing that tiny passage made a large difference in cooling. The hole is centered in the lower part of the phenolic block that holds the two thermostats. Hold it up to light to see if anything is blocking the passageway.

I did a full rebuild on a 1988 110hp Crossflow with no history on it other than it had overheated and seized. I foolishly did not change out the water diverters because they looked solid and were positioned correctly. The motor would not cool properly until I took the heads off and replaced those 4 hoses. When I pulled them out I discovered they had hardened, thus not doing their job.
 
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My new pump rebuild kit come in.
A interesting notice came with it.notice.jpg

When I took apart the water pump I noticed that the above mentioned O ring was not installed under the impeller.
I also recall them saying that it was not necessary and therefore it was not included with this total rebuild kit.

I was aware of the pinhole in the valve body spacer and made a point to check it.
I believe that the purpose of this pin hole is to prevent a air bubble from getting stuck behind the thermostats where the thermostats can't monitor a true cooling water temperature.

It seams that insufficient water pressure certainly could manifest itself as the problems that I have described.

I will let you know if the problem has been solved when I get it all back together.

In the meantime I appreciate all your help.
 
If the new waterpump does not solve the problem take the heads off (super easy) and replace the water diverters. Requires new head gaskets but....you know what they say..... Bust Out Another Thousand!
 
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