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That hole is probably an oil drain, not a crankase ventilation hole. If you don't have an oil drain for the separator in the air filter, you are either dripping the oil on the road or dumping it down the intake.
The crankcase will vent quite nicely through the chain case on the front of the engine -- it's not exactly constricted there....
Peter
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1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!
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