Every engine is not without it’s flaws. One of the flaws of the DT466 is that the o-rings around the cylinder sleeves sometime leak antifreeze into the oil. But the good thing is that this engine can be rebuilt with the engine still in the bus. This is called doing an “in-frame” on an engine. Below is a link to some video’s I found online that would give you a good idea of what you are up against if you were going to do a rebuild on a DT466. These videos are of an late 80’s early 90’s DT466. Most of us probably will have a DT466E which will have some different specifications but the overall idea is still the same concept. I recommend you see me to borrow my manual if you want to follow it step by step.
Some of the video’s the instructor is working on a Detroit 60 Series, but most of the time he is demonstrating on a DT466. Click the link below to watch the video’s on Fanshawe Motive Power’s youtube channel.