Mobile Diesel Service uses a pair of Case IH/New Holland dual valve covers (PN 2830784) with matching breathers (PN 504069558) from the 3.9L Cummins 4BT engine to replace four of the six stock ...

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The passenger side valve cover has a breather, which is the source of fresh air that a PCV system like this draws from. A filter element in the breather cleans the air before it enters the engine.