The oil separator tube is at the bottom of the air filter. This tube section should have an Oring on it. Available at the dealer. This tube goes down to the upper oil pan and that is the check valve I was talking about.
This site shows the engine crankcase ventalation. Your car will ebthe second engine. The diagram does not show the air filter oil separtor drain tube. It does show the tube ( #6) that it attaches to.
http://skinnerbox.steaky.org/Service/W123/w123CD2/Program/Engine/617/01-040.pdf
Dave
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1970 220D, owned 1980-1990
1980 240D, owned 1990-1992
1982 300TD, owned 1992-1993
1986 300SDL, owned 1993-2004
1999 E300, owned 1999-2003
1982 300TD, 213,880mi, owned since Nov 18, 1991- Aug 4, 2010 SOLD
1988 560SL, 100,000mi, owned since 1995
1965 Mustang Fastback Mileage Unknown(My sons)
1983 240D, 176,000mi (My daughers) owned since 2004
2007 Honda Accord EX-L I4 auto, the new daily driver
1985 300D 264,000mi Son's new daily driver.(sold)
2008 Hyundai Tiberon. Daughters new car
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