Little Diesels usually die from a lack of maintenance, people who change oil
maybe every 250 hours or so and never change an exhaust elbow
, elbows in particular will eventually fail and likely let salt water
into the engine, and as often as not, that’s the end of that engine. They have never heard of having the injectors cleaned, and never thought about adjusting valves.
Other than maybe seals
, years don’t really kill an engine, lack of maintenance does, and corrosion
doesn’t help either of course, and if left to occur corrosion
is related to age.
My 4JHE is 33 yrs old, has very few hours and runs like a top, uses and leaks
My little airplane’s engine is 77 yrs old, and has been overhauled likely a couple of times, but still it’s 77 yrs old, now and leaks
oil, a lot of oil actually. I need to overhaul
it just to fix its oil leaks.
We change oil in our Diesels to get rid the soot, soot is abrasive and your circulating a wear compound, the oil likely doesn’t even come close breaking down, you get to decide what’s enough abrasive particles to allow to build up in your oil before changing it.
In other words shorten your oil change
interval and you will decrease wear in the engine. If you do not want to change oil more frequently, look into a high bypass oil filter
, but don’t buy into the theory of I’ll use a high quality synthetic so I don’t have to change oil as often, because we don’t change our oil when it wears out, we change it to get the soot / carbon out, and soot build up just as fast in a high quality sun oil as it does and old fashioned single
grade Dino oil.
At least older Yanmar’s have very old fashioned simple combustion chambers, they are low swirl chambers and don’t mix the air and fuel as well as more modern high swirl chambers do, so Yanmar’s are “smoky” engines, it’s just the way they are, it doesn’t make them bad, or make them not last as long, just makes them smoky. They are also made for higher Cetane fuel than what’s commonly available in the US, but oddly to me I believe California
requires high Cetane Diesel, higher Cetane ignites quicker, burns faster and cleaner and less particulates than low Cetane fuel.
I assume the newer common rail motors that have to pass emissions testing have high swirl chambers to help pass emissions, but I have no experience with them.