rogerL1961

what should I expect if I remove the oil filler cap while the engine is running. Should there be positive pressure, a vacume or nothing. When I look in the hole should everything be covered in oil? I removed mine and it seems dry off to the front and I do see a little bit of oil more torwards the rear. Should I be able to see fresh oil being pumped up to the valve cover?

mrblond

I don't ever remove the cap during operation. Splatter city. Some day you may forget to put it on and then go driving and you will see what I mean.

Bark

I forgot to put mine on after an oil change (got distracted by a beer). You quickly notice the oil flying out and it made a "hollow" sound. Only ran it for about 10 secs it still splattered pretty good. Took awhile to find the cap also, it had rattled off the engine and hid under a tire.

Tank_66

Oh come on boys thats nothin... I did my oil change in drive wayon my 2001 cummins and forgot to put cap back on.. drove for about 180 KM and checked oil in morning and no cap and no oil in the engine compartment, quite surprised and lucky.. went and bought new cap and found my old one on my rad ... hahahah no gravel roads or nothin just straight highway...

PCM

Nothing - at least at idle. The return line for my by pass oil filter is thru a Amsoil oil return line fill cap. A great cap I might add! I have removed it under idle to see the flow of oil from the return line from the by pass filter. NOTHING but a stream of oil. No spashing or anything else. Again, that is at idle. PCM

SSminnow

OK:
1)Why are interested in what you should expect with the oil cap removed with the engine running?
2)If it is oil pressure you are worried about (or lack of) look at your gauge on your dash, that should help you some

rogerL1961

I was worried about oil pressure. I removed my cap and there wasn't the normal sound of air and oil splatter that I was used to with a gasser.

I have normal oil pressure on the gauge. I don't see much oil in there but its running. Even though I have lost power but that is because of the codes that went off which included High rail pressure.....

My oil looks fine. I don't see any other problems.

SSminnow

OK. Just for future reference, if your gauge says you have oil pressure, you are getting oil to the top half of the motor.

TexasCTD

Just an FYI.....our oil pressure gauges are not really oil pressure gauges. They are dummy gauges that read what Chrysler wants it to read as long as you have a certain very low minimum of oil pressure. Pretty much worthless. Sad.

rogerL1961

I have heard that before. I was told not to trust the stock oil pressure gauge.