Crankcase breathers are an essential part of any modern diesel engine. ... Over time, the breather valve and filter will become less effective, so it's often advisable to replace it.

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 ...

Q–I have a 1986 Chevrolet Silverado with the 305-CID and 4-barrel carb. It has 86,000 original miles, and I’ve always changed the oil at 3,000. The problem is that it is spitting oil into the ...

Crankcase breathers play a big role in reducing diesel engine emissions by recirculating blow-by gases back into the engine. ... and that's where the crankcase breather, or CCV filter, comes in.