Crankcases and PCV Valves
Dodge Dakota
Ford Bronco II XL

What can cause pressure in an engine crankcase?

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2004-05-14 15:53:32
2004-05-14 15:53:32

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.

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A PCV valve is for positive crankcase ventilation. It is to keep crankcase pressure from building up in the engine. If it does it can cause seal leakage, air filter contamination and engine blowby.

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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.

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not really. You can get blowby in the turbo itself from high crankcase pressure, but a turbo won't cause engine blowby.

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Blowby is a condition to where you have excessive pressure in the crankcase of an engine usually from worn piston rings. A faulty PCV system can also cause excessive engine blowby.

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Over pressure in the engine results in problems, e.g. oil leakage, over pressure in the engine will cause the pressure to leak through the seals for example oil filler cap and cylinder head cover, at the same time causing engine oil loss.

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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.

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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.

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PCV stands for POSITIVE CRANKCASE VENTILATION When the engine is running it builds pressure inside of the engine and if the pressure is not released then it will blow out the engine oil gaskets and leak oil.

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crankcase oil is the oil in the engine .some call it crankcase oil some call it engine oil

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the crankcase is below the engine block and holds the crankshaft pasta master

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Excessive blow by from an engine position sensor. You would check this by verifying crankcase pressure and making sure the engine is in proper time and valves properly adjusted.

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Did you mean PCV [positive crankcase ventilation]....that valve helps keep engine gasses from going to the atmosphere but wont allow intake pressure back to the crankcase.

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Vacuum should always be present in crankcase, it is provided by the PCV (positive crankcase ventilation system) pressure is what you don't want to see.

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Excessive crankcase pressure will cause this problem two possible causes are worn/broken piston rings or a blocked engine breather.

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1. The crankcase breather may be plugged. or---- 2. Too much crankcase pressure. There is too much blowby (combustion gasses leaking by the rings or piston), causing excessive pressure in the crankcase. To repair this, you will need to re-ring or bore out the engine with new pistons and rings.

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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...

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The engine capacity is calculated by measuring the size of a crankcase. The crankcase is the space that holds the pistons.

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Positive crankcase ventilation. Uses suction and a one way valve to remove pressure and vapors from the engine.

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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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the valves or rings are allowing compression blow by to enter the crankcase which causes excess pressure that is brought to the carburetor by the breather tube. your engine is getting tired or you have too much oil in the crankcase.

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...It will be what ever your suction pressure is.

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Crankcase is a generic name for the entire internal engine.

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to much oil in the crankcase is the #1 cause.


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