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- Jan 22, 2011
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The sending unit is made up of a diaphragm and a linkage to a switch inside if it has an indicator light. If it has a gauge, it still has a diaphragm but the switch is a variable resistor. Point is, the diaphragm can split, crack, pinhole, etc., and it is under direct oil pressure. They are crimped closed at assembly, and not serviceable. But they can leak a lot of oil. Usually you can tell by looking at the crimp area, or where the stud/screw comes through the phenolic.
The PCV valve is suspect for being stuck closed. The design is to recirculate crankcase vapors (smoke) from ring blowby back into the intake and be burned. If it is stuck closed, pressure builds up in the crankcase and can force oil out in weakly sealed areas, or sometimes even pop seals out of place. If there is a leaky seal, a small leak becomes a large leak because of the increased pressure.
The PCV valve is suspect for being stuck closed. The design is to recirculate crankcase vapors (smoke) from ring blowby back into the intake and be burned. If it is stuck closed, pressure builds up in the crankcase and can force oil out in weakly sealed areas, or sometimes even pop seals out of place. If there is a leaky seal, a small leak becomes a large leak because of the increased pressure.