Question about 1991 Toyota Pickup

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Crankcase builds pressure

The crankcase builds pressure then blows the dipstick out, then oil is blown all over the driver side of the engine. Using a quart of oil in 15 miles. When the dipstick is nice and tight the pressure seems to go through the rings and the engine smokes terribly. Have already replaced the pcv valve, no change...

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  • cliffie1953 Nov 18, 2008

    Thanks everyone...We figured it out later that one of the rings on #4 cylinder broke and that was the problem. Very confusing for someone who hasn't lost an engine in over 30 years.

    GC

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If your blowing smoke out the pipe then the oil rings are bad , thus the pressure from explosion in the cylinder is going into the crankcase, which would mean the pressure rings are going bad also.
so you have loss of power also?
you should get it repaired soon or you could blow a gasket also and then it could crack the head or block
hope this info is worth a fixya , and if you need more assistance then just ask me and I'll help

Posted on Nov 16, 2008

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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..

Posted on Nov 16, 2008

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Write your answer...does a cylinder head cause crank case pressure

Posted on Jul 21, 2016

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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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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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A crack at the base of the dipstick tube will care 2-3 quarts of oil spillage.

The only fix is to replace the oil tube on the bottom end,

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Oil backing up through the hole where the old dipstick goes. some kind of pressure problem


all engines burn oil, ALL!
and if you dive faster, it burns more. (rate)
you did not state the rate, here in USA we do
quarts per mile (liters are same )
1 qt/ 3000 miles is norm.
but if you dont service a vehicle , for sure every 60miles.
100km. the PCV valve will clog and the crankcase will go over
pressure, and the car will leak and burn more oil.
the dip stick hole must **** not blow.
if it dont **** , running, the PCV is DEAD !
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I have a 2003 Chevy Cavalier with almost 90,000 miles on it just recently I have noticed it is burning a lot of oil, however I have not noticed any oil leaking no residue on the ground or no smoke. I have...


have you checked the pcv valve ( positive crankcase ventilation ). plugged pvc symtoms-- can contribute to sludging of engine. it will build up pressure in crankcase if plugged. the pressure can blow out seals, it can also force oil past oil rings and burn oil up in engine. shake pcv valve, if it rattles its ok. if all else fails check oil pan gasket and filter also. ive seen holes in oil filters or they are loose. and upon driving, pressure is put on oil and it blows out.

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1 Answer

Oil leak passenger side 300 turbo sedan, some on front passenger side wheel. Never lost oil pressure, but dipstick showed very little oil in crankcase on immediate after-run check. Have not started...


Add about 2.5-quarts of new engine oil to the engine.
Remove the passenger-side wheel, and support the car on jack-stands.
Start the engine and look for oil leak.
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Sounds like the engine can't breath,
make sure pcv valve is good,or oil cap is vented.
your engine is building up pressure and has no where to vent,so it blows the easiest thing,the dip stick

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What engine? The oil level is good, not to high? If yes, it has too much crankcase pressure. Change the PCV valve and check the crankcase air filter. Also make sure you have vacuum at the PCV.

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