1989 340 sea ray Sundancer

B

boatingbren

New Member
Jan 6, 2015
5
Barnegat Bay, Atlantic city
Boat Info
1989 340 searay sundancer
1989 300 weekender
1992 34 silverton aft cabin
1979 31 silverton conver
Engines
2x454's-Silverton 34
2x 502's - sea ray 34
4x 350's -sea ray 300/ silverton 31
Hi All,

I have a 89 340 Sea Ray Sundancer. My engines are in the back of the boat with V-Drives.

I have this big Exhaust Copper tube that both sides of the exhaust goes into, on the end it looks like the weld rotted out and is now leaking exhaust and water when engine is on.

M question is can i fix this or is there a place i can buy this or is there a new system?

Thank you for your help
 
Without seeing the damage, I'm not sure if it could be fixed, but I'm sure all of those parts are replaceable. If the weld is rotted there, then its likely that there are other places that are near failure.

Wow... Do you have several 30 foot class boats, or is this a list that includes previously owned boats?!?!

Welcome to CSR!
 
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If you can post a pic or two that would be great. I don't know, but I doubt a boat that new would be using copper as part of an OEM exhaust system. Too expensive!!!! Check to see if the material is fiberglass like. IF that is the case, check a company named Centek. They have done a lot of exhausts on a lot of brands of boats. If you are going to upgrade, now is the time to so it.
 
Hi,

Thanks for the responses. I tried uploading via the thread but my images were way past the maximum in size.

Below is a link to the images on Photo bucket.

http://i76.photobucket.com/albums/j40/boatingbren/IMG_7607_zps0457b47e.jpg
http://i76.photobucket.com/albums/j40/boatingbren/IMG_7606_zpscd31b80b.jpg

Yes we currently have all of these boats. Its an addiction now lol

1992 Silverton 34' aft cabin
1989 340 Sundancer
1989 300 Weekender
1979 31 Silverton Convertible
1969 17' Boston whaler
1988 13' whaler
2006 10' avon
Yamaha 1200xl
 
dpmulvey said:
If you can post a pic or two that would be great. I don't know, but I doubt a boat that new would be using copper as part of an OEM exhaust system. Too expensive!!!! Check to see if the material is fiberglass like. IF that is the case, check a company named Centek. They have done a lot of exhausts on a lot of brands of boats. If you are going to upgrade, now is the time to so it.
Click to expand...

Those pipes are definitely copper. A good welding shop should be able to make the repair if there is enough pipe left to work with. With new pipe a replacement piece could be manufactured. Copper can be TIG welded but it sucks up heat so it needs to be done in a shop that knows what they are doing and has the equipment to do it. It can also be plasma welded.

I had that same boat and I know exactly what you are talking about but I'm surprised to hear that piece failed. May want to look for reasons. Does the engine have a closed cooling system or is it raw water cooled. Also I noticed in you sig that the 340 has 502s. These are not original but was the 7.4 exhaust used on the new engines?

Lots to consider.
Shawn
 
Thanks for the info. It looks as if water or something was dripping where it failed as its all oxidized and paint chipping off in just that one area. Although its in the perfect place to be used as a step and its not well supported so could have just had too much pressure and then the exhaust water just started eating it away there.

The engines are freshwater cooled.


The boat was repowerd in 2008 and had 502 blocks put in. But it looks as if the exhaust heat exchanger all stayed the same. If i remember correctly i think 454 and 502 are same engines just 502 is bored out.
 
There was quite a few of these made over the course of about 5 years. I'd start shopping the net and you might find something.
 
about mid span along the length there is a screw tab on the piece. It should be bonded at this tab to the bonding system. If not it may be the cause of the failure.
 
If you have one in your area, bring it to a good independent radiator shop. They shoud be able to give you a Thumbs up/down on the repair before they dig into it. IF it's a no, sell the copper. Great Lakes Skipper may be able to help here.
 
Thank you for the suggestion i have reached out to great lake skipper and sent them the photos. Does anyone know what this may be called?

I Have searched and searched online to try and find any thing like this that may work or what its even called and cant find anything.
 
I've always heard them referred to as linear or log muffler systrems. Frankly, they are functional but I'm not a big fan of them. I prefer waterlift mufflers. In a 330, it would make engine access a lot easier. Folks I know who have done the conversion say their boats are quieter at cruise as well. I cannot speak from experience on that though.
 
dpmulvey said:
I've always heard them referred to as linear or log muffler systrems. Frankly, they are functional but I'm not a big fan of them. I prefer waterlift mufflers. In a 330, it would make engine access a lot easier. Folks I know who have done the conversion say their boats are quieter at cruise as well. I cannot speak from experience on that though.
Click to expand...

With all due respect I need to disagree. That pipe is not the muffler but rather just the exhaust pipe. That piece is connected to the elbows and run forward (remember the engines are in backwards) to the back of the engine and then turn and run aft along the outboard side of the engines and then into the mufflers. The exhaust from the mufflers then exits through the side of the boat. I'm very intimate with this setup as I changed all 4 manifolds and elbows and one muffler on my 1989 340DA.
 
Happy Hour IV said:
about mid span along the length there is a screw tab on the piece. It should be bonded at this tab to the bonding system. If not it may be the cause of the failure.
Click to expand...

I agree, I know for a fact that they are huge pieces of copper... I'd call around to some local weld shops and see if they have the ability to TIG weld copper. It should be a simple fix.
 
NorCal Boater said:
With all due respect I need to disagree. That pipe is not the muffler but rather just the exhaust pipe. That piece is connected to the elbows and run forward (remember the engines are in backwards) to the back of the engine and then turn and run aft along the outboard side of the engines and then into the mufflers. The exhaust from the mufflers then exits through the side of the boat. I'm very intimate with this setup as I changed all 4 manifolds and elbows and one muffler on my 1989 340DA.
Click to expand...


If you had one, you would know better than I. The 1999 is nothing like that.

In any event, I would still opt for a waterlift muffler IF the cost was going to be close to a wash, a retro fit was not too cumbersome and engine access was improved.
 
My 79 express had that set up Copper pipes a few 90's and overboard. no mufflers and the 454 had a nice tome. I sprung a leak on a 90 deg turn i fixed it on the boat with jb weld. always keep on board
 
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