winterising engines in salt water

[mad_boater]

Can anyone help on winterising engines with heat exchangers?. I have owned boats for many years mostly used in fresh water. When laying up the engines I always remove the tops off the water strainers and on tickover I pour a 25% mixture of antifreeze and fresh water into them untill the mixture apears out of the exhausts.Now I am using the boat in salt water I wonder if it is necessary to do this as salt water requires very low temperatures to freeze.

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[hlb]

Yes, you can do the same. As I tend to use the boat through the winter I dont bother. But do switch onthe greenhouse heaters to keep engines aired.

<hr width=100% size=1> <font color=blue>No one can force me to come here.<font color=red> I'm a volunteer!!.<font color=blue>

Haydn

 

[Dave1258]

It's not just freezing to worry about, a good antifreeze also contains inhibitors to prevent corrosion.

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[hlb]

AAaRRggggg. Well put some antifreeze in. Like I said. BrrRUuummBBeerr.

<hr width=100% size=1> <font color=blue>No one can force me to come here.<font color=red> I'm a volunteer!!.<font color=blue>

Haydn

 

[ChrisP]

Having just spent a couple of grand on new intercoolers this is a subject fairly close to my heart. Advice from the manufacturers is to drain down all the raw water side and leave the cores open to the air for as long as possible after cleaning them. If the boat is to stay in commission replace all the "O" ring seals and rubber end caps. Then fit engine room heaters with a stat to turn them on at approx +1C. It gets kind of expensive but then so is a tow back to shore.

ChrisP

<hr width=100% size=1>What do you mean the sea gull in front's walking !!!

 

[david_bagshaw]

We use to keep our previous boat in salt water all year, my method was to run engines connected to a shore hose at tickover fro 10 min, then recirculate antifreeze before draining.

That was before wet vacs

Now if I was laying up in sea water would still rinse, then remove end caps & hoover out the fresh water from the core stacks. & then replacce the end caps , otherwise the engine antifreeze will be lost from the rubber ring seal.

Some will disagree butI have allways greased the mounting area of the core stack & its rubber ring using the grease used for front wheel drive shafts.& although it is grafite, my core stacks and the alloy areas are like new.

boat delivered 86.

<hr width=100% size=1>David
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