I wish!Marine age and lack of parts are the only things that really make them old. You can control marine age with good routine maintenance. If you have a very popular motor, parts should not become an issue. Granted technology keeps changing. Maybe some year we all burn hydrogen. Who knows.
The turbo outlet pipe to the charge air cooler will be discolored on high hp engines that run hard as the charge air temp can get to 400 degrees under load. That's the intake air not the exhaust. For surveys, compression tests on diesels are too expensive and time consuming so we used crankcase pressure readings at full load. A specific sized orifice was put in the blowby tube and measured with a manometer at full load. I wouldn't even take the time to hook this up if when I put a shop rag over the oil fill opening it blew off when I started the engine.Thank you guys.
Now how do you tell if engine has been run " hard" ?
Leak down test ,compression test ,prayer ?
I agree Jerry, my custome 32 DE was built in the Frank Sample yard in BoothBay in 1979 . She has her original 42yr old Lehman Diesel [ a tractor engine, really] She's a pleasure cruiser boat with less than 3k hrs. A mechanic joked that engine is barely broken in. If I maintain her maybe that engine will still be running when I'm in the ground.Ditto. I have a Ford Lehman in one of my boats (custom boat) that is over 30 years old and I don’t remember the hours on it. My dad has 17K and will be hitting 18K hours on his 6BT this year. He has friends with over 20K on the same engine. Maintenance, how the engine is run, rating from manufacturer all play into it. I have witnessed what poor maintenance can do, and seen how long an engine will last if well taken care of.
I see a lot of boats go for sale that have 5K on a Diesel engine and buyers run away without giving the boat a good look.