Hi Guys,I was out doing routine maintence on my truck and noticed that the crankcase (engine) was venting out of my oil dipstick tube,you can see it venting and the dipstick lifts up a little when the engine is running,so can anyone please help me solve this problem. Do the turbo diesels have a pvc valve somewhere,if si maybe mine is plugged up or something.Please help, I just had the oil changed by a diesel shop.

 

There is no PCV valve. The crankcase vents directly into the air intake. On the driver side valve cover you'll see a little box screwed into the top of the valve cover right under the intake tube with a little 90* rubber hose routed to the intake pipe. That box on the valve cover is the CCV dog house.

Pull the intake off and pull the CCV dog house off. There are two large o-rings under it that can be a pain to get back in their spots upon re-install. Once the CCV housing is off, you'll see a metal screen in there. Clean that up as good as you can and re-install. That could cause the crankcase to pressurize a little more than normal and blow out the dipstick.

Aside from that, make sure there is no water in the oil and run it if it's running fine. Check the compression if you want just to make sure everything is in good shape. I've seen a bunch of these trucks do this even when they have great compression numbers. I've marked it up to the dipstick not sealing to the tube correctly or strong enough to hold the pressure in the crankcase. In other words, this is considered normal for the most part. Obviously excessive crankcase pressure is an indicator of excessive blow by which is caused by excessive ring wear blowing compression into the crankcase. So check the CCV and pull the oil cap and see if there is excessive blow by. If not and it runs fine, run it. If you want assurance, do a compression check.

 

Thank you,I cleaned the screen and it took care of the venting problem....