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marksl

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Hello,

Can anyone help with some basic alarm levels for coolant taken from a marine diesel engine.
John from PA

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In marine diesels, the coolant needs to be chemically tested annually.  Coolant samples should be sent to a laboratory and have the pH checked as well as identify any metals or salts that are present.  Labs are also set up to check corrosion inhibitors.  Usually when you send a sample in you tell the lab what coolant you are using so they have a basis of comparison.  At least with respect to Caterpillar engines, go to https://caterpillar.scene7.com/is/content/Caterpillar/C10419422 and scroll down to page 66.  If you can be specific as to engine make, you might get better responses.

There are testing kits available from your engine manufacturer.  These are useful for on board more frequent checks, such as quarterly, etc.  So you might want to check with the engine OEM for a kit and recommendation.  
marksl

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Does anyone have any alarm recommendations from Yanmar for a 6HYM-WET. For instances it looks like the minimum alarm level for glycol is 50% 
John from PA

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Quote:
Originally Posted by marksl
Does anyone have any alarm recommendations from Yanmar for a 6HYM-WET. For instances it looks like the minimum alarm level for glycol is 50% 


That isn't a really large marine diesel (370 to 515 kW (500 to 700 HP) so testing of existing coolant beyond using test strips probably isn't practical.  Yanmar recommends extended life antifreeze with a change interval of every two years.  It should be changed ever year if not one of their recommended long life recommendations.

The 50% guideline you mention is a common recommended "mix", even for a car for instance.  It provides a freezing point of about -35 deg C (-30 deg F).  That point also is an optimum for heat transfer and anti-corrosive properties. 

coolant.jpg 


 

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