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Author Topic:   Overheating motor?
jaydelmonte posted 07-31-2002 09:26 PM ET (US)   Profile for jaydelmonte   Send Email to jaydelmonte  
I just took my new 72 sport with 78 Johnson 35 for first run. Runs great but after 30 minute run, I noticed motor cowling top and sides seemed quite warm. It is hard to tell if a stream of water is coming out discharge while underway. When I got to shallow water I got out and looked at the discharge while idling. Not a lot of water coming out but some. Seems like my old 62 Evinrude 18 is a lot cooler to the touch after a run. Air temp here in Orlando this evening was 80. Should I be concerned about this warm feeling motor or are there any other tests I can do before biting the bullet and getting a shop to check it?
whalersman posted 07-31-2002 10:17 PM ET (US)     Profile for whalersman  Send Email to whalersman     
It sounds like it's time for a New Water Pump Impeller. Your stream should be heavy at all speeds with this size motor.
It is relatively easy to install yourself. Or, have an Outboard Mechanic do it for you.
TampaTom posted 08-01-2002 12:50 AM ET (US)     Profile for TampaTom  Send Email to TampaTom     
Also pull the cowling while the motor is running (in water). Look for leaks in the back at the thermostat. OMC used plastic clamps that break (replace with SS hose clamps.) OMC dealer told me these break all the time and sometimes flood the engine cowling with cooling water (sometimes getting sucked into the carbs.) Bye Bye.
Caceman posted 08-06-2002 02:05 AM ET (US)     Profile for Caceman  Send Email to Caceman     
When my grandfather owned the Whaler, he had a little device put on the cooling water output that would redirect the water into the air behind the boat. That way you can just glance behind you and make sure the water is flowing well. The device is a U-shaped length of metal tubing screwed (I think) into a plastic fitting which in turn screws into the water output. I take some ribbing for it now, but it's always fun to use it to spray people, also.


Bigshot posted 08-06-2002 11:15 AM ET (US)     Profile for Bigshot  Send Email to Bigshot     
before you replace the pump, take a piece of wire and stick it up the tell-tale hole on the engine. This is a small hole that gets clogged easily. Clogging will not effect the temp but will effect your ability to look at it. If pump is more than a few years old or engine sat for a while, change it, easy to do yourself.

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