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Author Topic: whats the temp of outboard water stream supposed to be  (Read 376 times)

charlys1954

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Had my 1968 merc 200 20hp since 1998. I've never felt the temp of the water stream before. Last weekend I felt it after running the motor 5 min. or so. I couldn't hold my hand on the stream it was to hot. My home hot water temp is around 132 and it didn't feel that hot but close. So is it normal for the water stream to be hot or should it be fairly cool.
I'm a "Born in Ind" Redneck and proud of it

Mac Attack

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Re: whats the temp of outboard water stream supposed to be
« Reply #1 on: Jun 19, 2019, 09:34 PM »
You can touch 120 water.
After that the time you can touch it is less as the temp rises.

Now to answer your actual question.
The water is too hot coming out of that motor.
You need to get it cooler.
Pump and/or thermostat.
I would replace both actually.
Good luck.

fishogger

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Re: whats the temp of outboard water stream supposed to be
« Reply #2 on: Jun 20, 2019, 06:59 AM »
rite or wrong, I have always just removed the thermostat in those old motors. its not cold when it comes out so if they had a thermo, im sure it would be pretty hot.

 ill watch this thread and lean from the experts.

Jethro

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Re: whats the temp of outboard water stream supposed to be
« Reply #3 on: Jun 20, 2019, 07:44 AM »
The tell tale on my '94 25hp Merc barely ever gets above the water temp of the lake. Maybe slightly warmer, but barely noticeable.

My 6hp kicker the tell tale seems to be zero warmer than the lake water. My 150 I have never felt, no idea.

charlys1954

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Re: whats the temp of outboard water stream supposed to be
« Reply #4 on: Jun 20, 2019, 05:29 PM »
rite or wrong, I have always just removed the thermostat in those old motors. its not cold when it comes out so if they had a thermo, im sure it would be pretty hot.

 ill watch this thread and lean from the experts.

The water comes out right when it starts, no thermostat to open I would guess. The exit hole on the bottom cowl sometimies would plug so I drilled the hole a little bigger(3/32) a few years back it hasn't pluged since. Making the hole larger should let more cooler water pass thru the cooling system I would think.

Its a 50 year old motor so may not have a thermostat. I looked thru all the parts diagrams in this link for it and I don't see a thermostat.

http://www.marineengine.com/parts/mercury-outboard-parts/200/2296267-thru-2827676
I'm a "Born in Ind" Redneck and proud of it

charlys1954

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Re: whats the temp of outboard water stream supposed to be
« Reply #5 on: Jun 20, 2019, 05:36 PM »
You can touch 120 water.
After that the time you can touch it is less as the temp rises.

Now to answer your actual question.
The water is too hot coming out of that motor.
You need to get it cooler.
Pump and/or thermostat.
I would replace both actually.
Good luck.

 I'll have to remember to get a thermometer and check it.
I'm a "Born in Ind" Redneck and proud of it

fishogger

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Re: whats the temp of outboard water stream supposed to be
« Reply #6 on: Jun 22, 2019, 05:36 PM »
I don't know if it has thermostat or not.  I don't do mercs.  im an omc man. it should have though my 60s omc motors do.  top of the head there is a small cap/housing.

 



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