Heat Exchanger

[Zeida]

Folks, my CD33 came with a Universal Diesel #5424 Model 30 and a 2" heat exchanger, which sits at the back of the engine almost above the tranny. During longer motoring runs, the engine would overheat. Obviously the 2" h.e. was not enough... I was fortunate that a fellow CD-er sold me his old 3", which I refurbished and installed appropriately. It lasted for almost 10 years. Be aware that the end caps of these little monsters corrode and start leaking... I ended up with a supply of spares, since my refurbished h.e. was not in the best condition and the caps did not seal properly -of course I had the proper gaskets-... Finally it was time to get a new one. That is the one I ordered from Mr. Cool, a 3" heat exchanger. They ship it unpainted. I put on 2 coats of primer, made sure it was really clean inside and out, and painted it the color of my engine... I put in the pencil zincs before installing and my engine has never overheated again.
I also replaced my old and plastic raw water filter by the new one you see in the same photo... big difference.

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[Jim Walsh]

I replaced my engine a couple months after I bought my boat in 2006 so I have a 2007 M25-XPB which had the 3" heat exchanger from the factory.

[Capt Hook]

http://www.mrcool.us/302631-universal-h ... MgodencA6Q

Might this be what you seek?

Jim,

I may be looking to replace/upgrade the heat exchanger on my CD-31. I'm not sure if it has a 2" or 3". I think I'll be getting up close and personal soon. But the link says not for use in salt water. Would this still be the item I'd want?

Raw water is pumped through a heat exchanger so that statement seems absurd.

Apparently you should buy the model with the "CN" suffix for use in salt water.