Running without a thermostat

[kalinowski]

My W58 runs at around 190. The book says 180. Though I believe that 190 is acceptable, I was wondering about the effects of running without a thermostat. I’ve done this in my old “teenage” cars, but was curious about the necessity of a thermostat in a diesel engine. Any advice out there?

Dan Kalinowski
Jolly Lama #135
Ko Olina, O’ahu

[madsailor]

First, Dan, if you’re using the gauge as an indicator, get an IR
thermometer and check the temp around the thermostat. it could very well
be closer to 180. 190 is fine, though. However, diesels are not designed
to run cold – better to run at 190 than 160. Taking the thermostat out
isn’t a good idea.

Bob

On Wed, Jan 4, 2012 at 7:12 PM, kalinowski wrote:

My W58 runs at around 190. The book says 180. Though I believe that 190
is acceptable, I was wondering about the effects of running without a
thermostat. I’ve done this in my old “teenage” cars, but was curious about
the necessity of a thermostat in a diesel engine. Any advice out there?

Dan Kalinowski
Jolly Lama #135
Ko Olina, O’ahu

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Bob Fine
s/v Pelican
Pearson 424 Hull #8
http://thesailinglife.blogspot.com
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[unabated]

My 58 runs at 190, except when the alternator belt is slipping a little then it gets to around 200
Alan

— On Wed, 1/4/12, kalinowski wrote:

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[kalinowski]

You’re right Bob. The IR says 180 at the thermostat housing, so the new T-gauge I installed is off by 10 degrees. Go figure!

Dan Kalinowski
Jolly Lama #135
Ko Olina, O’ahu

[RichCarter]

Good advice. Diesels don’t like to run cold. All kinds of problems can be caused by running them cold.

From http://soundmarinediesel.com/q_and_a.html#engineidling

# The engine is run at below operating temp, leading to carbon accumulation in the combustion chamber, injector tips, piston rings, piston crown, valves heads, seats, and stems, exhaust manifold, turbocharger, etc. Carbon on these parts will lead to accelerated wear, and possible piston ring sticking and low engine compression.
# Also, the injected fuel gets past the piston rings, because the engine is not at the correct temperature, and dilutes the lube oil. This compromised oil is sent to ALL the engine bearings, where it increases bearing wear.

Regards
Rich

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[quent]

W-58 thermostat also closes off a bypass that recirculates coolant back through the engine block. Running a W-58 without a thermostat will likely cause the engine to overheat.
Quent

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