Does anyone know a company that sells a complete conversion kit for a 70's era Marine Power 454? I have called most sites on a web search and they claim there is nothing that old.

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Closed cooling, or fresh water cooling, is where the engine and manifolds are cooled by a recirculating coolant with antifreeze in it. The coolant is cooled by passing thru a heat exchanger which is itself cooled by sea water passing over the internal tubes.  So for salt water boats, the salt water only touches the sea water pump, heat exchanger, and exhaust system, and does not touch engine parts.

i am assuming that is an upgrade and not original? if so is it difficult to modify and should i consider it in my 79 410?

Hi William,

Attached is the page for the heat exchanger.  It has the phone number for MPI.

PatMarineEngineDepot.com.pdf

The Chris Craft manual has diagrams for both systems, so I assume fresh water cooling was a factory option.  It's typically seen in salt water boats. If that includes you, you might want to consider it. Difficulty probably depends on the boat and space in the engine room, and parts availability.

far as i know about boat history it was always great lakes based so guessing never salt water, but we are planning to do the great loop so it will be seeing some salt

for one trip, I wouldn't bother. just flush the system when you get back to fresh water. maybe install a cooler thermostat to prevent salt precipitation. 

Hi William,

See attached docs.

PatHeat%20Exchanger%20parts%20list.pdf

Warren, Did you have any luck getting measurements and pictures of the mounts for the heat exchanger? Thanks Bill



Warren Whitmore said:

William,

I will take measurements and better photos when I am winterizing the engines two weeks from now.

Bill,

Sorry, I forgot to post the photos.  They didn't turn out as clearly as expected.   It was a bit tight in the aft end of the engine room and I didn't have my calipers with me, so excuse the crude tape measure.   Here are the first three photos.
William J Snyder said:

Warren, Did you have any luck getting measurements and pictures of the mounts for the heat exchanger? Thanks Bill



Warren Whitmore said:

William,

I will take measurements and better photos when I am winterizing the engines two weeks from now.

Attachments:

Here are the second set of photos.

The main brackets holding the heat exchangers are tapered c-channels of brake bent aluminum.  The flanges of the channels face inwards. The forward end is approx 2.5" high, the aft end is approx 4" high.   The bottom edge of the bracket is approx. 5.25" long.   The flanges of the channel are 1.375" on the outside.   Material thickness is in the 1/8" to 5/32" range.

I failed to look at the brackets below the aluminum c-channels.   Based on my photos they appear to be pieces of steel flat bar bent and bolted to the bell housing.

I hope that helps.


Warren Whitmore said:

Bill,

Sorry, I forgot to post the photos.  They didn't turn out as clearly as expected.   It was a bit tight in the aft end of the engine room and I didn't have my calipers with me, so excuse the crude tape measure.   Here are the first three photos.
William J Snyder said:

Warren, Did you have any luck getting measurements and pictures of the mounts for the heat exchanger? Thanks Bill



Warren Whitmore said:

William,

I will take measurements and better photos when I am winterizing the engines two weeks from now.

Attachments:

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