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Old 11-19-2012, 11:59 PM
Silber Adler's Avatar
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is the 80 deg thermostat standard

I saw a post about thermostats and wondered. Is the 80 deg (176 deg F) thermostat standard? Pelican only sells the 80.

My Merc runs about 95 degrees. It climbs right up to that temp and then levels off and never has gone above it.

I haven't had it in summer weather. Max ambient may have been in the 70-80 deg F range.

Most other vehicles that I have have 195 deg F thermostats, about 90 deg C. It would seem logical, maybe wrong that the Merc uses a 90 or 95 deg C thermo.

Sorry for using both temperature scales.


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Old 11-20-2012, 12:48 AM
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The 80C is what is used in these engines. my 240 runs just about rock solid at 80C or 175F. I have the older gauge that readis in F. some times on a long grade it will climb up a bit then cool down once it flattens out.

The 85 300D use to run at 80C. then when I replaced it with the new engine, it ran quite a bit hotter. 95 or more. using an IFR Lazer unit, the temps around the engine wasn`t hot enough to worry about.


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Old 11-20-2012, 10:48 AM
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Quote:
Originally Posted by Silber Adler View Post
I saw a post about thermostats and wondered. Is the 80 deg (176 deg F) thermostat standard? Pelican only sells the 80.

My Merc runs about 95 degrees. It climbs right up to that temp and then levels off and never has gone above it.

I haven't had it in summer weather. Max ambient may have been in the 70-80 deg F range.

Most other vehicles that I have have 195 deg F thermostats, about 90 deg C. It would seem logical, maybe wrong that the Merc uses a 90 or 95 deg C thermo.

Sorry for using both temperature scales.
at 95C the 80*C or 85*C thermostat fully closes the bypass and all coolant/water is pushed through the radiator. Below that its in mixed mode.

The other reason is the quirk of older MB gauges being live gauges - they actually move to changes unlike other cars whose gauges are buffered which means that they can be at 80 or even 100C with the gauge in the middle.

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