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Boat mechanic contacted me during 700 hour service on twin Yamaha F300’s. He told me there was water in the oil in the port motor lower unit and the gaskets would need to be changed. This was the same finding at the 600 hour service with the same mechanic.
When I picked up the boat, he pointed out a 1/4” drill bit sized hole on the left side (looking forward from rear of boat) of both, the port and starboard lower units. He said that this is commonly caused by galvanic corrosion. Coincidentally, he has two trial lower units from Yamaha that he can replace my units with for a good price. He said the holes couldn’t be welded because the metal would likely get too hot and deform where the oil and exhaust seals sit.
I like this certified Yamaha mechanic and he is very reasonably priced for southeast Florida. The holes are circular, but somewhat rigid, and don’t necessarily appear to have been drilled. They look a bit corroded on the inside. See attached link for photos. Also, water runs out of them steadily when flushing motors with fresh water. It is odd to me that the motors only sit a few inches in the water when not being used and these holes are a few inches above that waterline. Not sure why electricity would do that, but I’m also not very mechanical to begin with. I did find a couple of posts with people reporting similar holes appearing in their lower units, but no one seemed to mention a direct correlation with galvanic corrosion or electrolysis.
The boat is a 2014 Pursuit 310 ST and is very good condition.
Has anyone experienced something like this?
Thank you.
When I picked up the boat, he pointed out a 1/4” drill bit sized hole on the left side (looking forward from rear of boat) of both, the port and starboard lower units. He said that this is commonly caused by galvanic corrosion. Coincidentally, he has two trial lower units from Yamaha that he can replace my units with for a good price. He said the holes couldn’t be welded because the metal would likely get too hot and deform where the oil and exhaust seals sit.
I like this certified Yamaha mechanic and he is very reasonably priced for southeast Florida. The holes are circular, but somewhat rigid, and don’t necessarily appear to have been drilled. They look a bit corroded on the inside. See attached link for photos. Also, water runs out of them steadily when flushing motors with fresh water. It is odd to me that the motors only sit a few inches in the water when not being used and these holes are a few inches above that waterline. Not sure why electricity would do that, but I’m also not very mechanical to begin with. I did find a couple of posts with people reporting similar holes appearing in their lower units, but no one seemed to mention a direct correlation with galvanic corrosion or electrolysis.
The boat is a 2014 Pursuit 310 ST and is very good condition.
Has anyone experienced something like this?
Thank you.
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