Help: Oil In Air Intake Hose?

I'm working on a 1989 240 DL. I've fixed a number of small issues before
selling the vehicle. I replaced the Mass Air Meter to remove a Check Engine
Light indication (code 121). While I had the hose going up to the throttle
body loose I noticed there was significant oil residue in the hose. I took
loose a smaller rubber hose going from the throttle body to the engine, and
that appears to be the source of the oil. I assume it's purpose is to
ventilate the crankcase? The little plastic gadget at the engine that the
hose connects to (I assume it's a PCV type valve) presses into a hose or
grommet that is connected to the engine.

The strange thing is the plastic unit has a screen in it, but no check valve
like a normal PCV valve. Is that correct, or do I need to get a new unit?

Thank you.

Louis

 

A little oil from the PCV system is normal. The setup you have with the
screen and no one way valve is also normal. Just make sure the PCV
system, all hoses etc. and that screen are all clean.

--
Mike F.
Thornhill (near Toronto), Ont.

NOTE: new address!!
Replace tt with t (twice!) and remove parentheses to email me directly.
(But I check the newsgroup more often than this email address.)

 

That is the flame trap. Make sure that it is clear or the crank case
pressures will build high enough to blow the seals out of the engine.

 

Thanks to all who responded. The information was most helpful!

Louis--
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