Modifying engine and generator exhaust thru hulls

Simon65

New Member
Nov 6, 2017
8
Boat Info
2004 Sea Ray 340 Sundancer
Upgrades below
Engines
Mercruiser 8.1S Horizons w/V-Drives
Zintex Gasoline Monitor
Krohler Generator
I have a 2004 Sea Ray 340 Sundancer With the engine and generator exhaust ports that are moulded/built into the hull with no actual thru hull fittings to remove. They are quite unsightly with chipped and damaged gel coat.
Inside the bilge is a long tube that runs from the hull to which the exhaust hoses are connected. In other words it isn’t a flush fitting, it is actually a long moulded tube moulded into the hull.
Has anyone modified their engine and generator exhaust moulded thru hulls to replace with stainless steel thru hull units such as Southco?

Or does anyone know of a stainless steel ring that could be fitted to the outer hull over the exhaust holes to improve the look?

I am just in the process of ordering replacement SS thru hulls for the other white plastic thru hulls so was hoping to also modify the exhaust ports too.

Many thanks for advice and help on this.
 

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I would suggest you find a good fiberglass repair guy to restore the OEM outlets. It will retain the stock look and performance and enhance rather than detract resale value. Modifying them as you suggest may create insurance issues in the case of a claim some day.
 
I have a 2004 Sea Ray 340 Sundancer With the engine and generator exhaust ports that are moulded/built into the hull with no actual thru hull fittings to remove. They are quite unsightly with chipped and damaged gel coat.
Inside the bilge is a long tube that runs from the hull to which the exhaust hoses are connected. In other words it isn’t a flush fitting, it is actually a long moulded tube moulded into the hull.
Has anyone modified their engine and generator exhaust moulded thru hulls to replace with stainless steel thru hull units such as Southco?

Or does anyone know of a stainless steel ring that could be fitted to the outer hull over the exhaust holes to improve the look?

I am just in the process of ordering replacement SS thru hulls for the other white plastic thru hulls so was hoping to also modify the exhaust ports too.

Many thanks for advice and help on this.

My engine and generator exhaust came from the factory with the Southco thru hulls, and I had my mechanic install one on my AC outlet. Our marina is on a river, and I used it stop the gunk from running down the side of the boat. In the pic below it's the one without the flapper. He cut off the back of the fitting that the hose attaches to, put a bead of 4200 around the inside of rim and filled the backside with epoxy,
and more 4200.
IMG952018021595153622956.jpg
IMG952018021595153551787.jpg
 
I would suggest you find a good fiberglass repair guy to restore the OEM outlets. It will retain the stock look and performance and enhance rather than detract resale value. Modifying them as you suggest may create insurance issues in the case of a claim some day.

Just started looking for a solution for this as well, and came across your response.
I have to say this is the most uninformed response I have ever seen on here.
The stainless will most likely enhance the resale and sure will look better. (ask any surveyor)
As far as insurance goes, it would have NO impact unless you installed them wrong. (Ask a qualified Marine insurance guy or girl)
 

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