1988 Seville Cuddy Cabin - 4.3 heat exchanger

[REPO1]

First post here!

I'm looking at buying a 1988 Seville CC. It has a 4.3 engine. Currently the heat exchanger is missing. The owner says it failed. I have a picture of the engine, and have been searching online for a replacement, but cannot seem to find anything that appears would match up to the hoses I see that are not terminated. Could you guys have a look and advise? I almost think that what is going on here isn't correct or original. Maybe someone was trying to make something work?

 

[dwna1a]

Try looking on MrCool. They have a large assortment of exchangers

 

[REPO1]

Try looking on MrCool. They have a large assortment of exchangers

I have been searching their site and others, but have not found an exchanger that only takes the two large hoses.

Just wondering though, why does a boat that takes in fresh water for cooling require an exchanger? Or were they trying to convert this thing to a closed loop type of system?

 

[dwna1a]

That would be a question for the gearheads here.

 

[scoflaw]

There has to be at least 4 hoses and most likely a 5th bypass hose. If you boat in fresh water you don't need a HE.

 

[Bill Curtis]

^^^^ What scoflaw said. You haven't "found" all the connecting hoses yet. Needs to be an absolute minimum of 4, usually 5 on the simplest systems.

Have seen a couple of 4.3 heat exchangers in fleabay.

Closed cooling (sometimes known as fresh water cooling) is used when a boat is used in salt or brackish water to keep the bad stuff out of the engine (half cooling), and in the case of "full cooling", the engine and exhaust manifolds. It doesn't hurt running in fresh water, too.

My 454 Mag is has closed cooling and was mainly used as a fresh water boat before I owned it.

Closed cooling also provides the advantage of running higher engine temps (normally 143 deg for raw water and 160 for closed cooling) for better performance and fuel economy and the engine coolant (antifreeze) eliminates the need, in some cases, to winterize the engine in colder temps.

A couple of diagrams that may apply to teach you how it all works.