Good morning.

I had some time to look around my engine compartment this weekend, trying to learn more about the design of these diesels. One of the things I did was to take the air filter housing off of the turbo, to learn more about the layout of those components.

My interpretation of what I saw is that the "oil handler" at the center of the air filter housing has a way to divert the oil component of crankcase gasses both down the oil drain tube that returns to the oil pan (as I understand at this point), but also back into the turbo. In other words, what is being sent into the turbo via the short black pipe that exits the "oil handler" at the center of the air filter housing.

The uneducated person (me) might think there was some "advantage" to increased "blow-by", as there is continuity between the crankcase and the tubo underneath the lid of the air filter housing; more "blow-by" just sends more air into the turbo via this device at the center of the filter housing.

Thanks for entertaining my questions.

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1982 300cd, 140k miles