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#1
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I've seen a light crust of ice on the surface on a calm winter morning. Even
though the sea water temp might get down into the high 30s or 40s, it is the outside air temp coming in through the ventilators that could freeze an engine. My engine room is about 80% insulated, down to just above bilge level, if outside air comes through the vents (always open), it could get down to freezing. Since I'm at the dock and paying a flat rate of $60 a month for electric. I keep a heater going along with a dehumidifier. I maintain a temp. of about 50-60 degrees in the cabin and engine room (door open). This is recommended to get the dehumidifier to work efficiently. I should mention, it get about two quarts of water a week even with the boat closed all week. I would guess about half comes from the air that I let in when I open the hatch and the remainder through the cabin and engine room vents. I should mention that I still have some main cabin hull left to insulate, however almost all of my lockers are now insulated and lined. Since I started using the humidifier, I haven't had any problem with mold on books, clothing or bedding. -- My experience and opinion, FWIW -- Steve s/v Good Intentions "Gordon" wrote in message ... Steve, I'd be curious to see how cold it gets near the engine in a sailboat sitting in Hood Canal in winter. I doubt the temperature of the salt water gets below 40 F and if the boat is sitting in it, the boat should stay that temp. Also seawater freezing temp is about 28.4 F . I can't see a block freezing and breaking in those conditions, Now if the boat is on the hard, different story. Gordon "Steve" wrote in message ... "Roger Long" wrote in message ... Can anyone out there give me some informed and real world (yeah, I know this is a newsgroup but, hope springs eternal) insight as to how vulnerable raw water cooled engines are to damage from freezing? My Volvo is designed for sea water cooling and each cylinder jacket, manifold and the OEM "water lift muffler" has a drain cock. Seems like a lot to remember each fall but these drain every drop of water from the block. To prevent these cast iron surfaces from rusting over the winter, I have three-way sea cock that allows me to pump anti freeze into the system. I don't actually do this, here in PacNW, since the temp never get that cold in my boat (heater) and I like to have the option to go out for you sail when the winter weather is nice. Check the location of your drain cocks on you Yanmar, see if they drain all the lowest points. I happen to have a small Volvo MD7A here with a cracked exhaust manifold because this model didn't have a drain cock and it must have frozen the standing water. Such a drain cock would have saved this nice little engine. Now I'm rambling. Sorry. Steve s/v Good Intentions |
#2
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That crust of ice is probably fresh water lying on top of the salt water.
Is there a creek or river entering the canal near your moorage? I've seen that inside the marina at Pt Angeles. Gordon "Steve" wrote in message ... I've seen a light crust of ice on the surface on a calm winter morning. Even though the sea water temp might get down into the high 30s or 40s, it is the outside air temp coming in through the ventilators that could freeze an engine. My engine room is about 80% insulated, down to just above bilge level, if outside air comes through the vents (always open), it could get down to freezing. Since I'm at the dock and paying a flat rate of $60 a month for electric. I keep a heater going along with a dehumidifier. I maintain a temp. of about 50-60 degrees in the cabin and engine room (door open). This is recommended to get the dehumidifier to work efficiently. I should mention, it get about two quarts of water a week even with the boat closed all week. I would guess about half comes from the air that I let in when I open the hatch and the remainder through the cabin and engine room vents. I should mention that I still have some main cabin hull left to insulate, however almost all of my lockers are now insulated and lined. Since I started using the humidifier, I haven't had any problem with mold on books, clothing or bedding. -- My experience and opinion, FWIW -- Steve s/v Good Intentions "Gordon" wrote in message ... Steve, I'd be curious to see how cold it gets near the engine in a sailboat sitting in Hood Canal in winter. I doubt the temperature of the salt water gets below 40 F and if the boat is sitting in it, the boat should stay that temp. Also seawater freezing temp is about 28.4 F . I can't see a block freezing and breaking in those conditions, Now if the boat is on the hard, different story. Gordon "Steve" wrote in message ... "Roger Long" wrote in message ... Can anyone out there give me some informed and real world (yeah, I know this is a newsgroup but, hope springs eternal) insight as to how vulnerable raw water cooled engines are to damage from freezing? My Volvo is designed for sea water cooling and each cylinder jacket, manifold and the OEM "water lift muffler" has a drain cock. Seems like a lot to remember each fall but these drain every drop of water from the block. To prevent these cast iron surfaces from rusting over the winter, I have three-way sea cock that allows me to pump anti freeze into the system. I don't actually do this, here in PacNW, since the temp never get that cold in my boat (heater) and I like to have the option to go out for you sail when the winter weather is nice. Check the location of your drain cocks on you Yanmar, see if they drain all the lowest points. I happen to have a small Volvo MD7A here with a cracked exhaust manifold because this model didn't have a drain cock and it must have frozen the standing water. Such a drain cock would have saved this nice little engine. Now I'm rambling. Sorry. Steve s/v Good Intentions |
#3
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Could be fresh water, however the entire canal shore line will have this
thin crust. I often drive the So. Shore (SR106)early in the morning and see this when the air temp is down in the 20s. Once the sun comes up and the shadow of the have been eliminated, the ice goes away. Steve s/v Good Intentions "Gordon" wrote in message ... That crust of ice is probably fresh water lying on top of the salt water. Is there a creek or river entering the canal near your moorage? I've seen that inside the marina at Pt Angeles. Gordon |
#4
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