2005 dry joint raw water cooled exhaust

Capt.G

Member
Apr 14, 2018
43
Boat Info
2005 Sundancer 300
Engines
5.0 mercs bravo 3
does anybody know if dry joint manifolds and risers need replacing at 290 hrs or is it years that dictate when needed to be replaced 5.0 mercruisers
 
Last edited:
I would say Years.... How old are they?
 
got 8 years out of my factory ones and when i replaced (preventative) them corrosion was minimal - at the time the boat was wet slipped in the northeast and the only time it was "flushed" was when it was winterized....
 
I have to go with 13 yrs because owner does not know if they have been changed he bought it in 2015
 
Last edited:
I just replaced mine.
2007 with 305 hours.
Wet slipped salt water.
Rust stains in one manifold and rust stains on the turbulator gasket on the same side.
 
I just replaced mine.
2007 with 305 hours.
Wet slipped salt water.
Rust stains in one manifold and rust stains on the turbulator gasket on the same side.
Was there a overheating issue or run hot
Before you changed them
 
There was a hairline crack in the port side manifold, which leaked water externally. I removed the manifolds and found them to be clogged with rust scale and debris. The risers were changed as well due to the rust stain inside the starboard side manifold and on the turbulator gasket.

There were no overheating or water pressure issues.
 
98E8C930-D38B-4A65-A9DE-46D29C8CFEAE.jpeg AB61365E-04A3-488A-8CFD-DAA758526FDB.jpeg

Here are some pictures
 

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