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Old 31-12-2013, 19:12   #1
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Join Date: Feb 2010
Location: NH
Boat: Tayana 37
Posts: 106
Yanmar 3qm30 exhaust manifold problems

Over this winter i want to get most of my interior mechanical projects done to be able to focus on exterior projects when the weather gets warmer. Today it was a balmy 22 degrees fahrenheit onboard!
Anyways, todays project was to replace the exhausting mixing elbow on the yanmar 3qm30F. The PO replaced the elbow in 06, so i felt it should be time to replce it again. I wasnt sure how easy or hard this project would be so i also ordered the flange the elbow threads into incase i couldn't unthread it. That all came apart easy, but on closer inspection inside the water jacket of the exhaust manifold it had rust and other deposits in the lower slot. I cleaned it out of which it had about 4 inches of material packed in there. Looking inside the manifold it looked very clean and hardly any carbon build up, but I am concerned about this manifold rusting from the water jacket in. I scrapped my screw driver on the inside of the manifold to see if my screwdriver would go through and it all felt pretty solid. I don't know if this has ever been taken apart and cleaned.
What have others found with this manifold and how long does it usually lasts? Our boat has seen very little use and was put up on the hard every winter with half of its life in fresh water. As far as i know this manifold is original from 1986.
Thank you in advance for any information.

ddsailor25 is offline   Reply With Quote

exhaust, yanmar

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