In the top of my 1981 240D air cleaner there is a hole similar to the one on my 300TD where there is a grommet for the valve cover vent line. But on the 240D the line run down beneath the air cleaner, so the hole is not used. In a Chilton's book it looks like a rubber plug should be in that hole. In mine someone put the cap off of a battery terminal in the hole ! Not the best for sealing I'm afraid. Any thoughts on where to get this plug besides a dealer ?

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David McDonald
1981 240D
1985 300D (wrecked)
1985 300TD 365,000 miles
1969 Mustang Fastback