Evinrude running hot to the touch

[ronward]

Re: Evinrude running hot to the touch

don't run it too long without thermostat and you'll be fine. but when you hook up the water hose be sure and only do one thing at a time. meaning, if you don't have the lower unit bolted up you are bypassing the water pump, if you also remove the thermostat at the same time you will not know definitively what is the problem. do the pump bypass, problem still exists then remove therm. problem still exists then it's time to start unbolting stuff to see inside motor.

 

[yorab]

Re: Evinrude running hot to the touch

Intriguing.

The best method is to put it in the lake, even on the trailer. This way, the water pump pressure is solely circulating the water through the system and there is a constant replenishment of cool water as needed by the cooling system.

The second best method is the garbage can method in which you fill up a can or tub and submerge your lower unit in it, deeper than the level of the pump. One drawback is that the water in the tub heats up over time and is not an accurate depiction of actual operating conditions. You can lessen this by sinking the hose to the bottom of the tub to constantly replenish cool water. The hose will be quite oily by the time you finish and if the water overflows the barrel, then the unburned sludge will create quite an interesting work of art in your driveway.

Lastly, you can hook up a garden hose directly to the water inlet pipe. With this method, the water never gets the opportunity to heat up and cool water is always flowing through the system whether needed or not. Also, the hose pressure is forcing the water through the system, not the water pump. This does not accurately depict actual operating conditions.

All three methods can work for different circumstances.

There is a special attachment that bolts up to the water inlet screen above and in front of the prop (picture water flowing into this inlet while the boat is moving forward). I forget the Tempo model number, but you can find the number on the forums. They are rare, but you can occasionally find one for sale online. Even with this attachment, you still have the situation of having the hose pressure, not the water pump pressure, force the water through the system.

Finally, it's important to know exactly how hot the heads are getting. Use that thermometer as soon as you get a chance.

 

[yorab]

Re: Evinrude running hot to the touch

Here is an old thread that contains some stuff that is not relevant here, but some of it may be:

http://forums.iboats.com/johnson-evinrude-outboards/1963-75hp-break-saga-continues-475680.html

 

[seahorse5]

Re: Evinrude running hot to the touch

if anyone can find the part number for my vernatherm, i would appreciate the help. I cannot locate the part number and there are a few of these vernatherms for the evinrudes. 1965model # 75553, 75h.p. Speedy four (standard). Thanks again!

#377276 - vernatherm

 

[racerone]

Re: Evinrude running hot to the touch

Why would you start one of these motors with the hose not turned on ????-------Makes no sense whatsoever !----Impeller damage will result if run dry.

 

[iggyw1]

Re: Evinrude running hot to the touch

#377276 - vernatherm

Thanks so much for the part number!

 

[iggyw1]

Re: Evinrude running hot to the touch

Why would you start one of these motors with the hose not turned on ????-------Makes no sense whatsoever !----Impeller damage will result if run dry.

I am hoping that's all the guy damaged is the pump!! I am anxiously waiting for the pump kit to arrive so I can get this thing done. I don't know why anyone would run it dry at all. That is like starting a car when you know there is no oil in it!! I ran it today with a hose connected to the suction line on the motor. (lower unit is still removed). The engine did not run well because it would not heat up properly, but I did find out the water passages are clear!!

 

[Bosunsmate]

Re: Evinrude running hot to the touch

I ran it today with a hose connected to the suction line on the motor. (lower unit is still removed). The engine did not run well because it would not heat up properly, but I did find out the water passages are clear!!

Maybe your thermostats a stuck open or the hose was on so much the relief valve opened.
But you would of had to of had the hose on strong to do that.

 

[Bosunsmate]

Re: Evinrude running hot to the touch

You should get it running properly on a hose first, because it should be able too and since it isnt you need to find out why not. Its much easier to troubleshoot with the LU off.
Get it running again and when its running rough, stop it and pull out the sparkplugs and look for signs of water/oil emulsion on them.
Maybe the exhaust gasket has gone.
Also what you can do is run the hose first and then see if it takes ages too start. If it does it indicates water is getting into the cylinders somehow- gaskets etc

 

[iggyw1]

Re: Evinrude running hot to the touch

You should get it running properly on a hose first, because it should be able too and since it isnt you need to find out why not. Its much easier to troubleshoot with the LU off.
Get it running again and when its running rough, stop it and pull out the sparkplugs and look for signs of water/oil emulsion on them.
Maybe the exhaust gasket has gone.
Also what you can do is run the hose first and then see if it takes ages too start. If it does it indicates water is getting into the cylinders somehow- gaskets etc

Well, looks like I am done testing. I ran it again today with the hose connected and T-stat removed. The other side (port side) started heating up along with the starboard side. I called my mechanic and he said it may be a head gasket is gone. I am taking it out to him tomorrow. I will have to pay for it to get repaired, but I am willing to do that if he could get it running real good for me with no water issues. I paid $2,000 a few weeks ago for the boat, motor and trailer. It is all 1965 model, and everything (even the trailer) looks like new! The boat looks like it came out of a showroom, as does the motor and trailer, but the motor has issues. If I spend $1, 000 on repairs, I will be happy to have only $3,000 into the entire rig. Thanks for all your help on this. I really appreciate it!

 

[Bosunsmate]

Re: Evinrude running hot to the touch

Post back on what happens.
I would of checked thermotat opens when heated in a saucepan and if it did then reinstalled and rechecked

 

[iggyw1]

Re: Evinrude running hot to the touch

Post back on what happens.
I would of checked thermotat opens when heated in a saucepan and if it did then reinstalled and rechecked

Yes, I did that and it seemed ok when I did that, however I still removed it to try it like that too since you do not have the spring tension against the disc when testing it in a sauce pan. I though maybe someone may have had too thick of spring or something.

I checked the compression yesterday (did not have a gauge earlier). Compression was 110-110-108-102. This was on a gauge that does not screw in. It is just held against the plug opening and has a rubber end on it. (cheap one?). Anyway. I am on my way to my mechanic with it in a few minutes. I will post here when he repairs it for me. Thanks!