detriot engine with a lot of blow by

[bob h]

I was in a truck stop this weekend talking to a guy with a Detroit Series 60 and he showed me his truck and he had a hose connected to the blow-by pipe under the engine and went into the exhaust stack.

Why would he do that

...I mean, what purpose could that possibly serve?

[/quote]Is this normal and OK to do this? [/quote]

No.

He did it so the smoke or steam wasn't coming out from under his truck and instead coming out the stack. I sort of thought that was obvious.

[bob h]

He did it so the smoke or steam wasn't coming out from under his truck and instead coming out the stack. I sort of thought that was obvious.

It is normal for a certain amount of crankcase gases (smoke, steam, whatever you want to call it) to come out of the breather tube. This problem is part of the '07 emissions for on-highway diesels, the '07 engines have a closed crankcase (no venting fumes).

If the gases are excessive... repair the problem. Actually, what he has done with the breather tube may actually compound the problem.

Under high exhaust flow, his crankcase will be under a high vaccuum

What SEEMS like a good repair... isn't always.