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smoky 144 140-160

posted by  someone claiming to be Rhys on  Wed Feb 19 14:49 CST 2003 [RELATED]

Pull the oil filler cap off at idle. If crankcase gases pulse out of the valve cover in a regular, rhythmic stream, then you have a bad case of blow-by. That's caused in most cases by a broken compression ring. A leak down test is your best bet. You can also remove plug wires in sequence to see which cylinder is contributing the most gases to the crankcase. If the crankcase gets excessive pressure, it can come from one place - the combustion chamber.
B18 and B20 engines used different crankcase venting system - the B20 uses a system that is the reverse of the B18. Sounds like the previous owner was trying to deal with crankcase pressure. As George says, it doesn't matter which way the vent system flows - if there is excess gases, the problem lies elsewhere.





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