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Old 09-18-2013
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Bukh DV20 Cooling System

I am currently in the midst of cleaning out my Bukh DV20 cooling system.
This has come about due to what appears to be a combination of excessive steaming plus common white smoke that has increased over the last 6 months.

Upon stripping the exhaust manifold and thermostat housing I discovered the thermostat was missing and the cooling water bypass was blocked. In this situation the cooling water flows directly through the block/manifold to the exhaust elbow and I am concerend the engine is not running at a consistent temperature. The previous previous owner (I have owend the boat for 18months) indicated it originally had a thermostat and from what we can gather it was removed by his Diesel mechanic.

The cooling water system also provides cooling water for the refrigeration condenser (on the pump suction side) plus the hot water exchanger (taken from the exhaust manifold) via a standard Johnson pump.

I am after experience/suggestions re the missing thermostat as well as the best plumbing arrangement (I am replacing all of the cooling/heating hoses). From what I can gather there appears to be many variations on how the cooling system was plumbed on these engines.
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Old 09-18-2013
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Re: Bukh DV20 Cooling System

Our old girl had a DV24 ..... Always ran cool. Only way you could get temp up was to turn off the water (sea water cooled she was) completely. Seemingly these things simply run cool.
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