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What would cause pressure to build up in base , pop oil dipstick , and blow oil out?

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Bad piston rings head gasket blown by an oil galley --damaged head

Posted on May 04, 2017

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Probably a plugged pcv valve, and it sounds like excessive blow-by.
PCV valve will probably only be a few dollars.

Posted on May 04, 2017

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1 Answer

How can I stop oil from coming from my dipstick?


Depends on the cause.
Blow-by is when oil blows by the rings in the cylinders into the combustion chambers or compression blows by the rings into the crankcase. It can also be caused when too much pressure builds up in the crankcase because of a venting problem.
So blow-by can cause smoke out the tailpipe from oil burning with gasoline, or oil collecting in the air cleaner, or blowing out a seal or other place like your dipstick tube.
If it is caused by worn piston rings, the rings have to be replaced.
If it is a venting problem, you need to open up the vent, like the PCV valve or the air intake port.
If you remove the cap where you add oil and there is a vacuum when the engine is running, the venting system is working. If oil blows out the hole, there is too much pressure in the crankcase.

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1 Answer

Missing on acceleration and blowing oil out dipstick


check your PCV ( positive crankcase valve ). It sounds like you are building up pressure inside the block and the valve isn't regulating it like it's supposed to....that pressure has to go somewhere and the dipstick is the next weakest link.

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1 Answer

1992 cadillac deville leaking oil at dipstick


I would look for other leaks. If you are sure it's leaking at the dipstick tube, there is normally an o-ring where the tube presses into the engine. In general, this is an odd place for a leak, as ther eshould be no oil pressure in the pan (where the tube terminates) and unless the engine is overfilled with oil, the tube end shouldn't be immersed in oil to leak. IF there is pressure in the oil pan, that generally indicates bad rings. I have seen engines where the oil dipstick actually pops out of the tube under pressure when the engine is running due to pressure in the oil pan from blow-by at the rings.

Jan 05, 2014 | 1992 Cadillac DeVille

1 Answer

Oil dipstick breaking


Most likely it is not. There should be a PCV valve that lets the pressure off, if it is bad or missing, that would cause the crank case to build up pressure and blow oil out. First though be sure that there is no leaks in the heads or gasket and that there is not too much oil in the engine. The dipstick tube should not extend all the way into the oil reservoir and let oil out.

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1 Answer

5.3 blows dipstick out


Sounds like your piston rings are bad causing excessive blow-by ...meaning your power is going around your rings and building massive crank pressure and using your dip stick housing as if it were a pressure relief valve ...motor needs to be rebuilt by an automotive machinist.

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2 Answers

Why is oil blowing from dipstick of a 1994 ford excort


Here's a link to the pcv valve,could be glogged up causing pressure to back up,Here's the pcv valve.

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hi the clearance on these will be 0.25 hot ( just run ) and the reason why you have oil coming out from dip stick is either you have too much oil in and need to drain some, or somewhere on the vacuum system you might have a blockage which in turn is casing a pressure build up and is forcing the oil out...hope this helps

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Your engine breather system is blocked....this means that the only way that the compression caused on ignition that is getting past the piston rings and into the block can escape is via the dipstick tube.
Check breather for kinks and some have filters ensure that these are not blocked

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3 Answers

Crankcase builds pressure


you definatley have a crack in cylinder head or block,,may be a head gasket too,,,you need to take it a part to see the problem,,no easy fix..not what ya want to here sorry..

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