1993 Johnson 60 hp possible thermostat problem

[sc_wildman]

Project boat nearly complete, but found another problem. Cranked motor yesterday and noticed that the water from the peehole got very hot, very quickly. I also noticed that the water stream started and stopped for a few seconds every couple of minutes. I checked the thermostat and it looked none too healthy, so i am going to replace it since i already have it out. Does this sound like a thermostat problem or more of an impeller/ water pump problem? Thanks for any help!

 

[leadpipe58]

If it were the impeller you would not have gotten any water up to the top of the engine to get hot.
A test while you have the thermostat out is to fire it up and see the flow coming out of the head.You can run the engine for a minute with out damage.
It will not shoot out but should have a good flow.Only caution is not too do it in salt water.Yo do not want it running all over the engine.
Good luck

 

[haffiman37]

If you are running in a barrel, a water pump problem. If you are running on muffs, quite typical!!!!!!

 

[sc_wildman]

Thanks for the replies gentleman! Going on the search for a new thermostat tomorrow. Haffiman, i was indeed running on muffs.

 

[haffiman37]

Your thermostat is in fact working perfectly. You loose the tel-tale when it opens due to lack of pressure. Not enough water supply from your muffs.

 

[sc_wildman]

Haffiman, thanks again for the reply. Another question if i may? When i removed the thermostat it came out in pieces. Is this normal for this motor? i have noticed on line that some companies are selling thermostat kits that it appears you have to assemble yourself. If this motor does indeed use a thermostat that has to be assembled by the purchaser, do they not make one that comes pre-assembled?

 

[haffiman37]

Check out the parts diagram:
http://www.marineengine.com/parts/j...rer=Evinrude&section=Cylinder+&+Crankcase

The thermostat element (vernatherm) is #37 Double check membrane/seal #29 for damage/leakage.