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From: (no name) (no email)
Date: Mon Oct 01 2007 - 12:36:08 EDT
In a message dated 10/1/07 11:37:28 AM, writes:
> SNIP:
> You can have winterizing done by the yard for several hundred dollars
> but it's such an inherently simple job that I'd rather spend the money on
> a few gourmet meals . . .
>
> REPLY:
> For most of the what you describe, I agree it is simple. But when it
> comes to winterizing the engine itself, I want a pro to do it. There are
> too many nooks and crannies for water to lurk, freeze, and then bust
> something. I'd rather have someone do that portion of the job who knows
> what they are doing rather than an amateur (me) do it. The money spent is
> good insurance.
>
David,
Have courage. Winterizing a diesel is not brain surgery.
There are only two water circuits in a diesel engine. The raw water comes in
the intake pipe, is circulated by the raw water pump through the water and oil
heat exchangers and then is sent into the exhaust riser where it cools the
exhaust gasses. It proceeds through the waterlift muffler (if you have one)
then
out the exhaust pipe. In some boats, a fraction of the raw water is pumped
out through a thru hull.
Winterizing the raw water system is simply a matter of having the boat suck a
water/antifreeze mixture through the system. When the mixture comes out
through the exhaust pipe, the raw water is purged. There are no thermostats in
the
raw water system. As I mentioned, I have a T fitting between the raw water
intake stopcock and the water strainer. When winterizing the engine, I simply
shut the stopcock, connect a length of garden hoze to the T, put the other end
in
a 5 gallon bucket of antifreeze/water mixture and run the engine for a few
minutes. When all the mixture is sucked into the engine and antifreeze comes
out
the exhaust, the job is complete.
The engine coolant system is self contained. In northern climes it should be
kept full of a 40% antifreeze/water mixture at all times for best cooling
efficiency. The water circulates through the block (and turbo housing),
manifolds
and water and oil heat exchangers (and possibly the hot water heater)
continuously with the flow controlled by a thermostat. There are no hidden
nooks or
crannies for untreated water to hide in. Just make sure that the coolant
freezing temperature is lower than the worst case expected winter temperature
in your
area. If you keep the engine coolant filled with the properantifreeze/water
mixture during normal boat operation, there is no need for additional
winterizing. It's just like your car.
Larry Z
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