Here is the deal. Easy to complex. 1. The EGR vale may be faulty"pluged up". The EGR hose and or the orfice that it connects to may be pluged up with carbon. This is common on engines that burn some oil. Disassemble and clean hose and orfice. Replace the PCV vale. 2. A blown headgasket can put pressure into the engine.It does this by letting cylender pressure vent into the crank case. Its too much for the PCV to vent so the engine ends up pressurized. 3.Bad rings can cause a pressurized crank case. what happens here is that the combustion gas passed by the worn out rings and ends up in the crank case. As you can see, if its not a PCV vale problem the repairs will cost some real money. Sometimes it better to just go and get a good used engine to relace a sick one.
Possible causes of fuel in crankcase are: Leaking injector at shutdown, flooding of the engine due to hard starting, defective fuel pressure regulator. A fuel pressure check for drop of fuel pressure at shut down will verify if an injector is leaking. Get this fixed ASAP, and stop driving the car until you do. Fuel in the crankcase will cause severe engine wear and destroy this engine. Change the oil and filter if you have to drive it anywhere for repair.
It is a filtered opening in one of the valve covers and allows the PCV to draw filtered air through the crankcase.Engine Breather SystemsInside an engine internal pressure is produced within the crankcase. This pressure is generally caused by a small leakage of combustion gasses past the piston rings, this is known as blow-by. If this pressure is not released, the subsequent build up can cause gaskets and seals to fail, creating engine oil leaks.
High crankcase pressure usually would be caused by clogged oil journals in the engine. There are passages through out the engine allowing gasses to escape from it. Older Ford Trucks actually had a vent tube that stuck out of the bottom of the engine to release this pressure. Burned valves and bad lifters and/or push rods can cause this also. Generally a tear down would be necessary to pin point the problem.
A few simple answers here... That oil is from the crankcase vent tube that comes in at the bottom of the box. It helps crankcase fumes to vent and get burned in the engine to reduce emissions. Several things cause the oil to come in. 1. too much oil in the engine/crankcase... (very common). 2. a plugged pcv (pos. crankcase ventilation) valve. normally located on the top of the engine on the valve cover. 3. high mile engines get some "blow by" thru the rings of the cylinders. this excessive compression gas gets into the crankcase at the bottom, then has to push out thru the vent tube at the top and takes some oil with it. Make sure your crankcase venting system is clear and clean. A plugged system can cause pressure buildup and it has to push out somewhere. eventually you can blow engine mainseals at both the front but mainly the back between the engine and tranny. An expensive repair bill there...
The positive crankcase ventilation or PCV system uses engine vacuum to draw crankcase vapors into the intake where they are directed into the combustion chamber and burned. This keeps pressure from developing in the crankcase which could otherwise cause gaskets and seals to leak. It also reduces sludge build up by drawing out water vapor. Once the engine reaches 212 degrees Fahrenheit (100 degrees Celsius) water in the oil turns to steam and is extracted with the other engine vapors.
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