Oil evacuated through oil filler cap (Solved?)

[Mr.wReckless]

As per title,

Driving along, I get the yellow oil caution light, didn't think much of it but took it slow and easy straight home, only to find it completely drenched in engine oil under the hood. Looks like it came from the oil filler cap.

The PCV was replaced somewhat recently, I had it apart now and it is completely clear, same with the tube from the PCV to the intake.
I removed all the plugs and compression was 155 on no1 and 160 on the last 5. A cheap gauge so perhaps not the most accurate, but even numbers across the cylinders.

If I remove the PCV tube from the PCV, I get a slight vacuum at idle, is this normal? I've tried googling this oil evacuation thing, but could only find 1 post stating the S54 is sensitive to overfilling, I may have been ever so slightly above max, but not by much at all.

I've had an old Mercedes 190e that decided to do the same through the dipstick tube, it only did this once and I never had that car do that again since.


Anyone know what this brass coloured thing is on the valve cover? Connects to the PCV, a one way valve of sorts?

I'd like to get some input as I don't want this to happen again.

Many thanks

[sapote]

“Anyone know what this brass coloured thing is on the valve cover? Connects to the PCV, a one way valve of sorts?”

Not factory setup.
More details on how the brass tube connected to the CCV (not pvc) and to engine will shed light on the problem

[jayjaya29]

That is not brass, that is just residual clean oil.

[fattycharged]

oil filter cap? I've done it....cant recall if I forgot the washer or stacked two, but what I do recall is it was a complete mess, it was everywhere. First oil change after purchase, needless to say I never did that again

[sapote]

oil filter cap?

Not the filter cap, but the fiLLer plastic cap on the VC. I don't understand how oil escape via the cap unless tons of high pressure inside the crank case but this should blow up the VC or the crank seals.

[Mr.wReckless]

“Anyone know what this brass coloured thing is on the valve cover? Connects to the PCV, a one way valve of sorts?”

Not factory setup.
More details on how the brass tube connected to the CCV (not pvc) and to engine will shed light on the problem

It's not a tube, it looks like a valve, I tried pushing the center of it but it wouldn't move with medium pressure so I don't think it opens downwards in that case.

It connects directly to the CCV/oil separator. The separator has 2 open ends facing the VC and one open end facing up, one channel I guess is the normal open end from inside/below to the valves, here it ventilates and passes through the CCV allowing vapours to condense. The other end faces this brass coloured "valve" and is open straight though to the top opening of the CCV (if all that makes sense).

On the photo below, these 2 openings face down on the valve cover, the one on the right is the "open" end with a channel through to the left and up to the hose connected to the intake. The left opening on the photo connects to the "brass valve" and on this CCV at least it is completely open straight through to the intake tube.



Any answers to if any of you have a slight vacuum at idle from the CCV when removing the intake tube from the vanity cover?

Regards

[Mr.wReckless]

That is not brass, that is just residual clean oil.

I agree, but I found calling it brass coloured would help clarify..

[sapote]

My bad. I thought the thing pointing by the red arrow is the brass tube, haha. It's the fat 12v cable to the jumper post.

The good or bad CCV thing cannot cause the oil to pouring out from the fiLLer cap.
How do you know that oil was coming out from the fiLLer cap?

[Mr.wReckless]

My bad. I thought the thing pointing by the red arrow is the brass tube, haha. It's the fat 12v cable to the jumper post.

The good or bad CCV thing cannot cause the oil to pouring out from the fiLLer cap.
How do you know that oil was coming out from the fiLLer cap?

Ah I see, no I'm referring to the brass coloured circle/hole between the spark plug holes

I can't say 100%, but there was a wet spot above it on the hood, plus the spray pattern it just seemed like it was coming out the oil filler cap, but I could be wrong. The engine bay was wet with oil on the vanity cover and more so on the exhaust side, the intake side was slightly cleaner and the further away from the filler cap the cleaner it was. The wet spot on the hood along with the angle of the engine makes me think it was plausible it came from the filler cap.

Regards

[Flow]

Vanos high pressure line ?
Do you have the updated one ?

[Mr.wReckless]

Vanos high pressure line ?
Do you have the updated one ?

Good suggestion. I didn't think of this. I got an upgraded one from Hack Engineering a while ago. Though that doesn't exclude it from being the culprit, but I refilled the engine and ran it at idle without it leaking any oil so I doubt it.

Regards

[Flow]

But since it is routed on the exhaust side, and that you have oil on the inside of the hood, it could be the culprit.
When you rev it higher, oil pressure rises and can cause a leak.

[Mr.wReckless]

But since it is routed on the exhaust side, and that you have oil on the inside of the hood, it could be the culprit.
When you rev it higher, oil pressure rises and can cause a leak.

Yeah you're right.. I'll check it!

Regards

[sapote]

I also bet on the vanos accumulator oil line connection tightness and itself.

[Mr.wReckless]

I also bet on the vanos accumulator oil line connection tightness and itself.

Will have a look. I checked my records and I swapped the line and accumulator only 5 years ago, doesn't mean they haven't gone bad in that time though.

Regards