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Old 10-24-2005, 10:42 PM
Sustainability Or Bust
Join Date: Oct 2004
Location: Edmonton, Alberta
Posts: 31
Oil Geyser (in my engine compartment)

1984 300d turbo, 417k, capable of 114mph, stock aside from K&N and advanced timing.

Hey folks,
Having a bit of an issue with the line that runs from the oil-breather (valve-cover atmospheric) down to the crank case nipple (behind the turbo nipple).

Background: I installed the www.wade************************ Stage 2 kit for the 300d, which consists of a K&N type filter, the proper intake pipe (mounts to turbo) and a replacement oil-breather unit, complete with catch tank and hoses.

Well, I didn't quite install the breather kit, as I discovered that the line that runs from the breather back to the crank case was dislodged from the crank-case. Yes, my engine bay is a mess now, but it gets worse.

Last night, I just ran the blow-by tube to a catch-can that I made out of a heat-proof receptacle, thinking that the mess was coming from there. That worked just fine, however, the line that goes down to the crankcase (with nothing feeding into it) geysered all over the engine bay, and onto the turbo. Not cool.

So, I guess I'm wondering if the metal oil-breather (return to crankcase) line requires the pressure coming from the valve cover to prevent itself from spewing oil all over the place. Or, is there another factor causing the oil to blow.

I'm worried that if I get the propper o-ring on the crankcase nipple, and route the line back into the performance breather kit that I have, that I'll be either 1. spewing oil all over the road, or 2. spewing oil into the intake tract via the optional port on the intake.

Can't I just cap the nipple, use a catchcan for the blow by (minimal) and call it a day?

Thanks in advance.

All the best,

1984 300d on BioD
"the sustainable life is the good life"
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Old 10-25-2005, 02:36 PM
Sustainability Or Bust
Join Date: Oct 2004
Location: Edmonton, Alberta
Posts: 31
any takers?
All the best,

1984 300d on BioD
"the sustainable life is the good life"
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Old 10-25-2005, 07:36 PM
t walgamuth's Avatar
Join Date: Apr 2005
Location: Lafayette Indiana
Posts: 36,136
i would like

to help but too much is left to the imagination for me to get an idea of the problem.

do you still have your stock setup?

tom w
[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.
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Old 10-25-2005, 08:51 PM
Johnhef's Avatar
Senior Member
Join Date: Feb 2005
Location: Frederick, Md
Posts: 4,540
A pic of your setup would help. I have a similar one on my 300CD, although I just got rid of the el cheapo catch can and oil seperator that came with the kit. They just melted and started leaking, pure junk. I got rid of the catch can completly and threw out the oil seperator, replacing it with an external seperator from a 82-83 240D. My rubber mounting piece from the intake to the turbo is deteriorating fast so I'm on the lookout for a replacment for it too.

I think you're referring to the drain tube that the air cleaner housing used to sit on? Mine too will blow oil back up out of it if left uncovered. You need to have your seperator sitting in it, with a preferrably new o-ring.


1980 500SE/AMG Euro
1981 500SEL Euro
1982 380SEL
1983 300TD
1983 500SEC/AMG Euro
1984 500SEC
1984 300TD Euro
1986 190E 2.3-16
1986 190E 2.3
1987 300D
1997 C36 AMG
2003 C320T 4matic

past: 1969 280SE 4.5 | 1978 240D | 1978 300D | 1981 300SD | 1981 300SD | 1982 300CD | 1983 300CD | 1983 300SD | 1983 380SEC | 1984 300D | 1984 300D | 1984 300TD | 1984 500SEL | 1984 300SD | 1985 300D | 1986 300E | 1986 560SEL | 1986 560SEL/Carat | 1987 560SEC | 1991 300D 2.5 | 2006 R350
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