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Blowing oil out of filler cap. - Cars & Trucks

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Excessive crankcase pressure, plugged PCV system . PCV positive crankcase ventilation . May need new PCV valve !

Posted on Apr 06, 2015

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6ya6ya
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SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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Posted on Jan 02, 2017

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Oil blowing out of filler cap 320 deisel


Hi dose the car still have power? And is it smoking ? If not check the Oring on the filler cap see if it is still ok if not the oil will blow past it

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Check your PCV valve. Its the device that provides ventilation to the crankcase and valve covers. If its clogged or non functional it will cause the engine to **** or blow air from an area with less resistance, which is probably the filler cap. As its blowing air out of the engine it will shoot a little bit of oil with it

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yeah, it's supposed to do this, so keep the cap on when the engine is running

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there will be,if it shoots the cap off while you are unscrewing it then you might have an issue,but oil will come out with car running and cap off

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Oil is boiling in sump blowing burnt oil fumes out the filler cap


I doubt the oil is boiling in the sump or your engine would show signs of over heating. Change the PCV valve in the valve cover as it may be stuck closed causing internal pressure to build up and escape through the filler cap.

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Volvo 960 estate blowing oil from the oil filler cap Whats causing it?


Your PCV / Oil trap is likely clogged. I have had some luck running Mobile 1 Synthetic oil and half a can of seafoam in the engine oil to clean things up but it is likely that you will have to replace the pcv system.

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Oil coming out of engine oil filler cap even though i have changed oil filler cap


The engine breather pipe seems to be blocked.
It may also damage the oil seals.

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Its blowing oil out of the oil cap why would this be ?? also i bit of white smoke then came out the back


The oil level may be too high.
Is the filler cap tight?
blow-by in the cylinder piston rign area. A wet test of engine compression will detect this.
A bad had gasket. Engine will be over heating as water is being used up during combustion.
Bad head gasket. Could explain white smoke in exhaust.

If the engine is overheating I would be suspecting a problem in the head area.

Good Luck. SnugglePants

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its the oil filler cap get a new one . if it blew off it mean sthere too much oil in the engine.

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First of all make sure all your engine breathers are clear. If they are then I would suspect something is wrong with pistons/rings.

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