Is it necessary to run a thermostat in a '81 Merc 260

holorinhal

holorinhal

Petty Officer 2nd Class
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May 26, 2009
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I converted My '81 260 Mercruiser from the old log exhaust to EMI THUNDER center rise exhaust.
I had to change the thermostat housing to a newer style, with less hose conections. Question is can I run without a thermostat or is it absolutley necessary?
Below is a picture of the new exhaust and t-stat housing.

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tpenfield

tpenfield

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Re: Is it necessary to run a thermostat in a '81 Merc 260

I'm not sure how the number of hose connections impacts whether (or not) you use a thermostat. By the looks of the t-stat housing on that engine, you should be able to have one in there, so you may as well.
 
achris

achris

More fish than mountain goat
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May 19, 2004
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27,468
Re: Is it necessary to run a thermostat in a '81 Merc 260

The thermostat regulates engine temperature. Without it the engine will never reach a proper operating temperature. At the right temperature the cylinder block expands to the correct size and shape, as do the pistons. Also the low temperature contaminates in the oil can't boil off.
 
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