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Cool Telltale with Steamy Exhaust Relief - 1994 Johnson 20HP
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<blockquote data-quote="Pappy" data-source="post: 443272" data-attributes="member: 3278"><p><span style="font-size: 18px">Your engine operates on a thermostat at idle and just off-idle. </span></p><p><span style="font-size: 18px">It should be running around 135f give or take. That temp means that you can place your hand on the top of the cylinder head for about 5-6 seconds before it becomes uncomfortable. When on plane the engine is by-passing the thermostat and that water will be a bit cooler. See for yourself. </span></p><p><span style="font-size: 18px">The overboard indicator is just that....it indicates that your pump is pumping. It is not dependant on the thermostat for flow therefore it will be pumping cooler water. The water you are feeling from the exhaust relief is after the thermostat hence the difference. In fact the water you are feeling is after passing through the water jacket on the rear of the cylinder head. Should be nice and warm!</span></p><p><span style="font-size: 18px">Change a pump if you have had it in there for 3 years or longer but I wouldn't change it because of what you are seeing.</span></p></blockquote><p></p>
[QUOTE="Pappy, post: 443272, member: 3278"] [size=5]Your engine operates on a thermostat at idle and just off-idle. It should be running around 135f give or take. That temp means that you can place your hand on the top of the cylinder head for about 5-6 seconds before it becomes uncomfortable. When on plane the engine is by-passing the thermostat and that water will be a bit cooler. See for yourself. The overboard indicator is just that....it indicates that your pump is pumping. It is not dependant on the thermostat for flow therefore it will be pumping cooler water. The water you are feeling from the exhaust relief is after the thermostat hence the difference. In fact the water you are feeling is after passing through the water jacket on the rear of the cylinder head. Should be nice and warm! Change a pump if you have had it in there for 3 years or longer but I wouldn't change it because of what you are seeing.[/size] [/QUOTE]
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Cool Telltale with Steamy Exhaust Relief - 1994 Johnson 20HP
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