Where is the PCV valve on a Duramax?

These trucks actually have 3 pcv valves. Two located in each valve cover (non serviceable. sold as part of the valve cover) and one that screws into the bottom of the alternator bracket.

Why do PCV reroute on Duramax?

The PCV reroute will still let your crankcase pressure vent excess pressure & oil mist. It will just be venting it somewhere else (atmosphere or catch can, that’s up to you) rather than into your intake/intercooler/turbo….

Does Duramax have a crankcase filter?

The PPE 114025000 Crankcase Breather Filter Kit for your 04.5-10 GM 6.6L Duramax decreases the chance engine runaway that can be caused by oil vapor that travels through the crankcase breathers and into the intake system. Kit includes 2 billet machined aluminum crankcase breathers, Filter Assembly, Hoses, and Clamps.

Why is oil blowing out of my breather pipe?

The cavity holds about a cup of oil. When the engine is off the PCV opens and allows the oil to drain into the pan. If the PCV is plugged the cavity will fill up and overflows out of the breather pipe. This seems to happen more after a hard run or pulling hard, at least on mine it did.

What does it mean when your crankcase breather is blowing oil?

If your crankcase breather is passing oil, chances are that something’s wrong (Okay, we know something’s wrong, but don’t be too alarmed). Here are some things to look for while you’re searching for the source of the issue:

What should I do if my engine oil keeps blowing into the air filter?

Purchase an engine flush formula from your local parts store and follow the directions. In general you will pour the formula into the oil and run the engine for a period of time. Once the engine has been flushed drain the oil and fill it with fresh engine oil. Replace the filter and see if the problem persists.

Where does the breather pipe go on a LB7?

The LB7’s have a hose from the tee between the valve covers to the alternator bracket, which has a cavity in it, the drain to the oil pan has a PCV screwed into it and a hose going to the block. The breather pipe comes out of the alternator bracket at a higher point and then goes down and is open to the air at the right front of the engine.