M40 diesel raw water cooled engine

[DMC]

Hello,

I'm concerned about my E35-3 engine (M40) and if any water may be remaining in it after haul out this winter. Thought if I run the engine for 30 seconds or less while it is on the hard it may expell what water could be left? Is this a good idea or could it cause damage??

 

[KS Dave]

Best practice for a "wet" winterization of the raw water cooling system would include running a couple of gallons of antifreeze through the system as part of your final shutdown. Running it dry will have a negative impact on your impeller and other parts of the system not to mention any trapped water in the system could freeze and cause expensive damage. The Universal M40 manual (also found on in the Resources section on this forum) has the procedures you should follow.

You'll want to get the pricier glycol-based pink RV antifreeze (easiest way to tell, apart from ingredients, is the alcohol-based has combustible warnings on it). I've found that Menard's has the best everyday price on it (I see you're based in OH). Expect to pay $5-6 gallon, but it's cheap insurance in my opinion.

 

[Loren Beach]

O34 - Coupler, Shaft Seal, and Antifreeze

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ericsonyachts.org

I just winterized the whole raw water circuit of our engine a week ago. When you do the next haul out, consider changing to the Forespar thru hull valve that makes this process so easy. Rediculously easy.