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Winterize raw water cooled Volvo?

I'm sure this has been answered here somewhere but I can't seem to find it in a search result- have read conflicting things other places. I have a raw water cooled Volvo 2002 and the boat is in Seattle on fresh water. Our winters are not really cold, and I have read that the water helps keep the motor from getting really cold, but I expect the lake temperature to be a bit colder than Puget Sound in winter. What do those of you around here do as far as winterizing the motor? Will be changing oil & filter, and plan to top up the fuel tank so there is not a bunch of air space over the diesel fuel. Also, what fuel additives do people like to stabilize the diesel?

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Re: Winterize raw water cooled Volvo?

Just run a gallon or two of RV antifreeze through the engine. Close raw water sea **** and open filter, have someone start the engine and when it fires pour the antifreeze in as fast as it will take it. Shut off when you can see pink coming out with the exhaust. I generally don't bother unless I know the air temp is going to get below about 25F and stay there for awhile. Fresh water will obviously freeze at a higher temp than seawater so unless you have a heater going you might want to be a wee bit more cautious.
Use a biocide in the fuel (Biobor?) and I use Stanadyne to raise the cetane for faster starts in cold weather (actually use it all year, good lube for injectors).

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Re: Winterize raw water cooled Volvo?

The outside water may actually be warmer than the inside boat air. Big cold snap like what we got right now could burst the thruhull .Anti freeze is fairly important.
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Re: Winterize raw water cooled Volvo?

Unless you have more than a little surface ice on the lake, you do not need to winterize.
If you do use the pink, before you do it, take the T-stat out first, otherwise there's a good chance the pink will never make it into the engine block.
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Re: Winterize raw water cooled Volvo?

That's an excellent point. So you need to make sure that the through-hull fitting is sitting full of antifreeze not water i take it?
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Re: Winterize raw water cooled Volvo?

We had one of these raw water cooled Volvo's 3 boats ago. +1 for remove the thermostat before pinking. Also, those thermostats exposed to the raw water (although yours is fresh so not so bad) do deteriorate and function poorly after a bit. If you take it out for the winter, suggest replacing it with new when you recommission (along with raw water pump impeller). Good insurance.

It's single digits here this AM, so we are feeling the cold!
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Re: Winterize raw water cooled Volvo?

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Originally Posted by danvon View Post
That's an excellent point. So you need to make sure that the through-hull fitting is sitting full of antifreeze not water i take it?
Open all your thru hulls, when on the hard. More often than not, I pull the hose off the inside of the thru-hull to run anti-freeze through the system. That means the valve still has some water in it.

If opening the thrru-hull on the hard means that anti-freeze drains out, it doesn't matter much. For the engine, at most, you'll lose the antifreeze up to the impeller. The block will still have product in it. I theory, as long as you've displaced all the water, it no longer matters, if the anti-freeze drains too. However, AF has some rust inhibitors, so it's good to have in the block. An empty intake hose doesn't matter.


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Re: Winterize raw water cooled Volvo?

Danvon , Wintering in the lake isn't something those guys back east can wrap their heads around .Since the water in the thruhull is the potential problem, wrapping an old sweater around the fitting inside should do it. Protects it the from cold inside air and the fitting will be relatively warm as the outside water. If you can walk out to your boat, all bets are off.
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Re: Winterize raw water cooled Volvo?

Sorry. I thought this was the thread with the boat going on the hard for a couple of weeks of repairs.


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post #10 of 10 Old 12-17-2016 Thread Starter
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Re: Winterize raw water cooled Volvo?

I hope not. not yet, anyway.

thanks.
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