The wonderful thing about a diesel
is indeed its long life. But to know just how many hours you trusty engine will last one must first think ....its not how many hours just what kind of hours were placed upon this unit.
To diesels don't like to run not under load so to leave your engine running while not in gear
is hard on it, it needs to reach thermal operating temp or you will get excess carbon and sludge buildup inside.
Most people just don't change oil enough. At 150-200 hours its ready for new oil and filters. The marine environment
plays hell on them and nothing can ruin it faster then water in the fuel
injection system. NEVER store your boat with empty fuel tanks
or you will get water condensation
inside the tanks
. Speaking of the fuel system the injectors (easy to change) should be removed inspected and perhaps changed each 3-4 thousand hours of service. Look at the engine anti-freeze and if your using the green stuff you might want to think about flushing
the system and converting to the red colored longer life coolant
. NEVER mix the colors. Anti-freeze has chemical compounds that fight against electro corrosion
inside your engine and this stops nasty things like cylinder sleeves from being eaten away as well as oil and trans coolers. The red colored coolant
last much longer.
Don't run your engine at more then 75% of it rated output. Your dealer will have an engine RPM
power output scale if you don't already know what its is. For example an Isuzu C-240 60 HP engine will reach its max output of 60 HP at 2400 rpm
. If you just use 40 HP of its potential you might be holding your RPM back to 1800 max. As long as the engine is reaching its running temps and sounds happy why push it so much harder when you will only get one more kt speed yet shorten your engine life.
With proper care a good engine can easy last 25,000 -30,000 hours before you are looking at a rebuild
. Your fuel injection system will last approx. 15,000 hours with clean fuel before the pump should be pulled and inspected.
How long will it last ? Its hard to say given all the possible aspects. But with good care it will indeed last as long as you own the boat.