Join Date: Aug 2003
Location: Long Island, NY
Thanked 82 Times in 77 Posts
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Re: 1 gm Yanmar--Best Case Senario
IMHO most marine diesels wear out from the salt water environment than from mechanical use. A diesel that is treated to basic maintenance will run for many thousands of hours. A diesel that is exposed to salt water can be worn out in 10 years. I've seen things like oil pan rotted from salt water, then the oil leaks out, then the engine is junk. Same thing with exhaust manifold - it gets plugged from salt / scale build up, then the engine overheats and the head gets warped. IMHO those are NOT an oil problems or cooling problems - that's a poorly maintained engine.
I would be scared of a raw water cooled engine in salt water. I would be afraid of the internal water passages and just about every part of the engine. Inspection will be very difficult. I don't want to scare you but as you guessed, it's impossible to tell.
My last boat had a 1986 Universal Diesel M25. I bought the boat in 2006 with 3500 hours on the engine. I sold the boat in 2014 with about 4000 hours on it. The engine ran great, make good power, ran nice and cool, etc. During my ownership. I had the heat exchanger cleaned out, the exhaust manifold changed, changed the raw water pump, and did most other basic maintenance. The oil pan was showing signs of rusting, otherwise the case seemed fine. The hardest part was keeping the engine clean, the electrical connections tight, dry, and clean, and that stuff. Otherwise change the oil once a year, keep the fuel clean, and don't worry about it.
Deep Blue C, 2002 C&C 110
Mt. Sinai, NY
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