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Old 05-28-2018, 06:57 AM
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mike koen mike koen is offline
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Engine temperature

My boat always ran at 160 degrees . This year I replaced the thermostat and gasket and also did the re-plumb kit . Now the engine is running consistently 190 to 210 degrees . Thermostat is a sierra marine 160. I am worried , is this normal operating temperature ?
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Old 05-28-2018, 08:01 AM
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Just to start, you could take the thermostat back out place in a pan of water on the stove, heat pan of water to 160, stat should slowly start to open. Of course you need a thermometer to put in the water, dollar store, buy two if you buy cheap thermometers. See if they read the same.

Also did you inspect the raw water pump impeller, check debris inside of cooling hose in front of trans cooler.

I wouldn't run at that temp.

Check those first and can go from there.
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Old 05-28-2018, 08:04 AM
trunderw trunderw is offline
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I thought I remember reading that these motors prefer warmer but fire regulations had the thermostats adjusted down to 160 for all boats. Did I dream that?
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Old 05-28-2018, 08:25 AM
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Why did you replace them? Was there something wrong?
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Old 05-28-2018, 09:07 PM
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mike koen mike koen is offline
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No nothing was wrong . Just being pro active as the stat was original 10 yr old. Same as the cooling hoses so I did the replumb kit which was recommended to curb any future problems. Just concerned as the operating temp seems to be 40 degrees warmer now. MCOCD.
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Old 05-28-2018, 09:14 PM
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The impeller was replaced last week and the trans cooler inspected when I installed the replumb kit . I took the shrink wrap off 2 weeks ago and boat has not been in the lake yet. I ran it on the garden hose connected to the Indmar sea strainer. Just worried that engine temp is 40 degrees different.
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Old 05-29-2018, 12:41 AM
gweaver gweaver is offline
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What's a 'replumb kit'? Is that just a replacement impeller, or are you talking replacing all hoses or something along those lines? Maybe a hose didn't get hooked up correctly, or impeller was installed with the fins the wrong way? If it can't flow enough water, you'll see a higher temp.
If you have one of those infrared thermometers, I'd use that to verify the temperature of the exhaust manifolds, see if they show the same temp as the boat's temp gauge.
Is it possible you were given the wrong thermostat?
G
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Old 05-29-2018, 06:55 AM
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"Garden Hose" thats the ticket...insufficient water flow...I bet once the boat is placed in the water the the temp issue goes away.
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Old 05-29-2018, 11:41 AM
curver900 curver900 is offline
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mine idles at 160 on a garden hose all day long... check to make sure the new impeller is not spinning on the shaft (lack of a better explanation) there have been impellers that are not staying attached to the brass sleeve...
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Old 05-29-2018, 07:34 PM
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Replumb kit is recommended for mcx as it re routes water flow through manifolds to keep them cooler .
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