[C320-list] Winterizing the Yanmar 3GM30F

[John Morrison]

The 3GM30F has a heat exchanger through which is circulated raw water (from the lake) and the antifreeze which is in the engine block and hot water heater. All that is needed is to circulate antifreeze through the raw water system as the engine already has it's own antifreeze and thermostat does not need to open. The engine antifreeze should B changed every few years. The antifreeze U put into the raw water system should be notox or lowtox type and an automotive antifreeze is not required. This is because it just sits in the heat exchanger over the winter. In the spring U should catch this antifreeze at the exhaust and dispose of it properly. 

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> On Oct 26, 2017, at 1:17 PM, Daryl Hunt <drhunt at rochester.rr.com> wrote:
> 
> My usual process for winterizing the engine is to run -50F antifreeze through the raw water inlet until it comes out the exhaust.  My concern is that this doesn't give the engine time to warm up enough to open the thermostat, potentially leaving water in the engine block.  I haven't seen any comments or procedures to deal with this so perhaps my concern is unfounded?
> 
> -- 
> Best regards,
> Daryl
> 1999 C320 #660 "Believe"
> 
> Rochester, NY - Lake Ontario
> 
> 
> 
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