160 degree Tstat for my Univ 5416? - SailNet Community

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Go Back   SailNet Community > On Board > Gear & Maintenance > Engines > Diesel
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  #1  
Old 02-21-2012
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160 degree Tstat for my Univ 5416?

is listed? For some reason I thought it would be a 195.
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Denise, Bristol PA, Oday 30. On Tidal Delaware River, Anchor Yacht Club. New Website!
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Old 02-22-2012
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Operating temp. of 170 to 185 - 160 sounds right.

http://www.ewmanchester.com/CalDocs/...s%20Manual.pdf
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Old 02-22-2012
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Thanks MD! I just thought they run hotter, or should.
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Old 02-22-2012
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If RAW water cooled - 150 deg. Tstat
If Fresh water (heat exchanger) then 180° Tstat.

With raw water cooling if the water temp. 'goes above' 155° carbonates will 'drop out' (precipitate) of the cooling water and quickly foul the cooling passages with (calcium, etc. carbonate) scale ... and that will require constant 'descaling' or 'pickle-ing' of the cooling system.
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Old 02-22-2012
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Hey,

Two years ago my 'stat went bad. I installed a 180 stat from a Kubota dealer. It costs about $30 and was a perfect fit for my M25.

Barry
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Old 02-22-2012
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Barry, yes pretty sure it's bad on my engine too, takes forever to warm up, just like a car with a bad stat.
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Denise, Bristol PA, Oday 30. On Tidal Delaware River, Anchor Yacht Club. New Website!
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Old 02-22-2012
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Rich, yes it has a HeatEx.
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Denise, Bristol PA, Oday 30. On Tidal Delaware River, Anchor Yacht Club. New Website!
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Old 02-22-2012
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Denise ...

Its a conundrum ... at greater than ~155° you get more scaling, and at well above 155° you continually develop 'black' rust (ferrous oxide) which is protective of cast iron hence longer 'corrosion' protection.

If you descale, you ultimately remove 'base metal' which shortens engine life ... unless you use an inhibited descaler (RydLyme, etc.).

If you run your engine 'long and hard', and use antifreeze with rust inhibiters when 'storing' the boat, a 150° T stat will be OK.
Since youre in the Del. River which is mostly 'fresh' near Trenton ... you might want to consider a 180° Tstat and simply do a routine 'descaling' with an inhibited descaler when the normal operating temp. rises ... 'profile' your engine with an IR thermometer and descale when the engine shows 'hot spots' above what you 'profile' when the engine was 'descaled'. Profile the 'whole' system - engine AND exhaust manifold AND injection elbow, etc. IR optical thermometers are cheap from Amazon, etc.
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Old 02-27-2012
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I found a thermostat in the "junk" box on my boat! I think it's for the engine. 180 degree it's not as large as a automotive type. it's about 1.25 dia. I'm wondering now if my engine even has a tstat. I'll report back on this sometime in the next few weeks.
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Old 02-28-2012
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Let us know how you get on, my 5424 is taking forever to warm up too.
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