I would like to think you are correct but I don't want to over heat the
engine. I am told that is a no-no with these engines.
What I have is an old 165 HP inline 6 cylinder GM engine - 250 cid.
Basic GM block used by Mercruiser for a number of years in the 60's and
70's.
I bought a heat exchanger that I am told was originally used on that
engine on ebay last winter. It had been retrofitted for use on a
smaller inboard engine in a sailboat for a number of years.
The sailboat underwent a bit of a rebuild and at the end of the day they
installed a new engine with its own cooler setup.
Before that happened, this heat exchanger was cleaned up and was ready
for re-installation.
I have not taken it apart but I have photos of the inside of it
somewhere, from when it was cleaned out.
It does look as though it has reasonably large passages through it.
So, the filter idea may only be a temporary thing while I see how much
gunk is showing up. I wonder if a screen of some sort might be
sufficient just to see what appears at the outset.
However, as I said, I don't want to ruin the thing. I am told that if
one overheats this engine the head will warp and it will then need
extensive work.
My whole reason for wanting to do this change to closed cooling is to
make a cabin heater more viable. One can run a heater core off of the
engine like in a car and I am told it is much more effective with a
closed system vs a raw water system.
For those spring and fall days, it would be nice to have a heater under
the dash that would blow a bit of warmth back at me.
Randy
On 12/10/2012 10:56 AM, Dan Penoff wrote:
Randy,
I am only familiar with smaller engines that use heat exchangers in
marine applications, but even with them the tubes in the heat
exchanger were easily 1/4 of an inch in diameter at least, so I can't
imagine there bring enough cruft in the engine to plug them up.
As for a coolant filter, I have only seen these on industrial Diesel
engines, and they were more of a means to introduce and maintain DCA
(decavitation additive) than to actually filter the system, as they
were relatively small, the size of a typical spin on oil filter, and
had a minimal amount of coolant flow through them.
I would think that if your coolant is clean and properly mixed, there
would be no issue with converting it to a closed system.
Dan
On Oct 12, 2012, at 11:46 AM, Randy Bennell <rbenn...@bennell.ca> wrote:
Does anyone have any ideas on how one might filter coolant on an engine?
I admit I have not done any sort of google search etc. I am just putting this
out here to see if anyone has encountered such a device or has ideas of how one
might create such.
The gist of it is that I would like to filter coolant on a boat engine.
I have an inboard outboard that has been run for years with lake water pumped
through it. - Only fresh water so not an issue of salt water corrosion but
never-the-less somewhat rusty looking inside.
I would like to install a closed system setup so that the engine uses
anti-freeze and is cooled by the fresh water going through the heat exchanger.
The folks on the boating forum suggest this is not going to work because the
rust particles from the engine will clog up the heat exchanger passages.
They say it should only be installed on a new engine.
So, my thought is that there must be some fairly simple way to filter the water
flowing through so that I can trap and remove the rust particles.
There is some space available on a boat so not like trying to fit something
under the hood on a car.
Ideas?
Randy
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