Crankcase breathers are an essential part of any modern diesel engine. But what do these breathers do and why are they so important for diesel engines?

one in each valve cover, plumbed to a Summit Racing breather tank on the firewall. With the valves removed, the PCV valves simply act as 90-degree elbows. This setup would be the "inlet" side of ...

The problem is that it is spitting oil into the breather through the valve cover tube. Is there a cure for this? J.S., Quaker City, Ohio A–Not only is there a cure, there is a cheap and easy one.

When a fuel tank is not sealed ... See All 19 Photos 12.Also inspect the rubber grommets that seal the PCV valve and the breather pipe to the valve covers. When these harden or crack, fumes ...

Whether it's in the form of a simple breather, or a more effective PCV system ... whether through the rear main seal, timing cover, valve covers You get the point. A positive crankcase ventilation ...

Imagine one day, years ago, in some equipment shed out in Middle America, an innovative farmer looking at oil dripping from the bottom of the well-seasoned 5.9L Cummins engine in his Dodge Ram ...