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Author Topic:   Evinrude 40 hot hot hot
Cabane posted 04-19-2003 10:41 PM ET (US)   Profile for Cabane   Send Email to Cabane  
Not stolen but got hot fast. It is a '72 although my title says 71. Same for the hull. Anyway, I just got this unit and ran it today. Long story short, how do you pressure test the lower unit?
Sal DiMercurio posted 04-20-2003 12:44 AM ET (US)     Profile for Sal DiMercurio  Send Email to Sal DiMercurio     
You don't preasure test the lower unit to see why it got hot.
If you haven't changed the water pump or thermostats in the last 2 - 3 years, theres your problem.
The only reason you would preasure test the lower unit is to see if the preasure leaks out of the cavity that holds the grease, if it does leak out, it means your seal or seals are gone & most likely all your lower unit grease.......has nothing to do with cooling the engine.
Sal
Cabane posted 04-20-2003 10:27 AM ET (US)     Profile for Cabane  Send Email to Cabane     
Hi. I should have gone with the long story in my first post.
The fella I bought this unit from mentioned he had changed the water pump impeller last season. Since the hot running, I have removed the lower unit. The pump impeller was indeed new. Unfortunately, the pump housing and bottom plate are severly scored. The gear housing grease looks like milk so obviously the seal is shot too. Anyway, I have the parts on order. So,I would like to know a good easy proven method to pressure test the lower unit once I put it back together. Also, I can't find a thermostat. I do see what I think is a temp sensor. That's another subject. I either didn't run it hot enough to cut out the ignition or it doesn't work.....
thanks
Bigshot posted 04-21-2003 10:06 AM ET (US)     Profile for Bigshot  Send Email to Bigshot     
Take it and have it tested, you don't want to blow out the seals again. The scoring is most likely your problem but it could be a clog somewhere also. If your new pump don't do it, then try compressed air to clear out a clog.
WhalerGoFar posted 04-21-2003 01:49 PM ET (US)     Profile for WhalerGoFar  Send Email to WhalerGoFar     
Another good method of clearing out clogs such as "mudd-dobber nest" is to use weed eater string, sorta like a pipe cleaner but green. There isn't a thermostat on the Evinrude 40. Most Marine Service Centers will be glade to do both vac. and press. test for a small fee.

As to your not running it long enough to set off the alarm, let the service center check out your power pack. I cured my over heat alarm problem by replacing it. In my case I noticed it wasn't shuting down when I turned the key to the off postion. When I replaced the power pack....I then found I had an overheat problem because the horn worked then too.

Good Luck and Happy boating.

WhalerGoFar

Whalerdan posted 04-22-2003 12:01 PM ET (US)     Profile for Whalerdan  Send Email to Whalerdan     
When the guy pressure tested my old lower unit he use a pum like a bicycle pump with a gauge on it. Pretty simple. No sure the PSI he went to, but it wasn't much. 3-5 pumps on a small pump. I bet you could buy the tool for less than they would charge you to do the test, or make on with some old lower unit plugs and a bicycle pump.
RMS posted 04-23-2003 12:34 PM ET (US)     Profile for RMS  Send Email to RMS     
If you're making your own tester, instead of modifying an old lower unit plug, just use the fitting which connects to quart bottles of lower unit fluid. Lubriplate makes them.
Cabane posted 04-23-2003 04:24 PM ET (US)     Profile for Cabane  Send Email to Cabane     
Thanks all.
I broke down and bought a Clymer repair manual. It tells how to pressure and vac test.

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