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  1. Keith_J

    Purpose, Function, and Possible Elimination of CDR Valve

    The CDR uses the air filter restriction induced vacuum to induce a 5 inches of water vacuum in the crankcase. This is less than 0.20 PSI vacuum. Tiny. The real purpose of this vacuum is to draw air into the oil fill cap(there is a filter in there, hence its shape) to keep blow by gases clear...
  2. Keith_J

    Purpose, Function, and Possible Elimination of CDR Valve

    Factory specification for crankcase vacuum is 5 inches of water at 2000 RPM. A dirty air filter could restrict air flow, causing this vacuum at lower RPM. No throttle in a diesel intake so air flow is engine speed dependent. When the air filter clogs, the CDR prevents excessive vacuum in...
  3. Keith_J

    Purpose, Function, and Possible Elimination of CDR Valve

    The CDR keeps the crankcase at a very slight vacuum AND induce fresh air flow through the crankcase to keep blow by humidity from spoiling the oil. Fresh air enters the crankcase through the oil filler cap. Also engine crankshaft seals can weep with excessive crankcase pressure. On turbo...
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