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Originally Posted by Beagle
If blow-by is sufficient to lift off a loose filler cap it's time for a rebuild!
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That would be a total waste of money to rebuild a good engine based on minor blowby.
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2nd- do you think that the absence of a positive crankcase ventilation system would cause harm to an engine? Lets say the the crankcase pressure only had to overcome atmospheric pressure at all times.
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Not at all. The CCV system is for emissions control only (to burn leftover hydrocarbons and oil vapor), almost all modern diesel engines in semi's and off-road vent their CC gases straight to the atmosphere and have done so for decades.
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Vacuum between T/C and filter is 4 to 5 inches at 3000rpm and increases with rpm
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If you have that much vacuum then your air filter is dirty or too restrictive.
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Crankcase pressure is undesirable, causes leaking F/E and R/E oil seals and in extreme cases as the subject of this thread can blow oil out of dipstick.
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If you have enough positive pressure to blow out those seals, they were either LONG overdue to be replaced or the breather is
severely restricted.