[YokoE91]

Hey guys, im new to the forum, nice to meet ya all, and sorry for my bad english, english is not my main language.

Long story short i bought e91 320d m47 120kw, had dpf blocked, and damaged turbo cuz of blocked dpf... So i went to the auto repair shop, they restored the turbo, changed the oil, oil and air filters, and deleted/unprogramed the dpf+catalyc converter, egr is unprogramed also. So for a fewnweeks everything was fine car was like new, no power losses or anything, only a tiny amount of blue smoke on cold starts (i have one glow plug thats failing, diagnostics showed that, so im planing to change glow plugs and glow plug module soon). And now i get like every 500km warning light that i need 1 liter of oil, i check the disptick ant thats right, its at the minimum, i toped it up at first, thinking that new turbo might burned it, but no its still gone like every 500km 1l of oil. No smoke while driving that i could see, only blue smoke on startup for a few seconds, and a little bit of black smoke when acelerating agresively. So i tought i will take a look under the bonet in my garage, and i saw a big leak of oil around the injectors and the breather, also the engine oil cap is really tight, so i ordered new breather maybe it is the case. No other leaks from what i see, i removed the egr hose only a tiny bit of oil that i think is normal. So my question is what is it, could the oil breather blow so much oil out, when driving agresively? Or is it a new turbo? (They gave me 24months warranty on a turbo) Or what it is? No loss in power, not smoking. Cant really see any leaks driping down only tiny ones from the breather/injectors. Thanks guys, any answers would be appriaciated. If someone need photos or video i can do that.

Forget to mention car has 215,000km on the clock, dont know if its true carvertical shows that it is true, services do the same, and the wear on the car shows the same i think.

[P14kle]

Change the valve cover gasket. The valve integrates the Crankcase Breather system into the Cover. The gaskets go hard and cause pressure to pass through into the Valve area when Turbo pressure is applied. This pushes the oil up and out of any area where it can escape.

[tadaska]

Originally Posted by P14kle

Change the valve cover gasket. The valve integrates the Crankcase Breather system into the Cover. The gaskets go hard and cause pressure to pass through into the Valve area when Turbo pressure is applied. This pushes the oil up and out of any area where it can escape.

Where does the oil go in such situations?

[YokoE91]

Originally Posted by tadaska

Where does the oil go in such situations?

In my case only leak i can see is here around the breather and the injectors

https://youtube.com/shorts/0Lu9w7RlMxs?feature=share

Is it really a VCG? No loss in power, no drips on the bottom engine cover, only leak is here that i showing in a video, and blue smoke only on startup for 2-5sec. When i dont drive car hard it is not consuming a lot of oil, but i do drive it hard, so its like 500km 1l or so. If its VCG thank you will look into that.

[tadaska]

Originally Posted by YokoE91

In my case only leak i can see is here around the breather and the injectors

https://youtube.com/shorts/0Lu9w7RlMxs?feature=share

Is it really a VCG? No loss in power, no drips on the bottom engine cover, only leak is here that i showing in a video, and blue smoke only on startup for 2-5sec. When i dont drive car hard it is not consuming a lot of oil, but i do drive it hard, so its like 500km 1l or so. If its VCG thank you will look into that.

It could be your oil cap seal. They don't seem to last long. I had oil on top of my engine. More than once. I clean it up and fit a new seal and it's ok for a year or two.

[YokoE91]

Originally Posted by tadaska

It could be your oil cap seal. They don't seem to last long. I had oil on top of my engine. More than once. I clean it up and fit a new seal and it's ok for a year or two.

I will change it, but can an oil cap seal leak 1l/500km of oil, dont think so, my engine would be flooding with oil.

[P14kle]

Trust me, under boost it can push a surprising amount of oil out via the crankcase breather. It could fill a catch can up easily, along with intercooler/piping/Inlet manifold. Mine also pushed oil out and around the filler cap, (even after new one fitted).

I chased same issue for ages. If the Valve cover gasket is original it will be hard and brittle. It seals around the injector holes etc, so thats how oil is forced up and around any slight gap on top end.

Its a cheap replacement and one that will last another 15 years or so the same as the original one. (200+k its about due for one id say)

[YokoE91]

Originally Posted by P14kle

Trust me, under boost it can push a surprising amount of oil out via the crankcase breather. It could fill a catch can up easily, along with intercooler/piping/Inlet manifold. Mine also pushed oil out and around the filler cap, (even after new one fitted).

I chased same issue for ages. If the Valve cover gasket is original it will be hard and brittle. It seals around the injector holes etc, so thats how oil is forced up and around any slight gap on top end.

Its a cheap replacement and one that will last another 15 years or so the same as the original one. (200+k its about due for one id say)

Sounds about right bro, a lot of people has this mysterious oil leak/consumption on m47 and change the whole engine, or just sell the car. But your words make sense, i will change it, yea probably it is original, its weird cuz not a lot of m47 owners talk about this problem. Thank you i keep the post updated if that helped.

[Robb678]

Originally Posted by P14kle

Change the valve cover gasket. The valve integrates the Crankcase Breather system into the Cover. The gaskets go hard and cause pressure to pass through into the Valve area when Turbo pressure is applied. This pushes the oil up and out of any area where it can escape.

Hi P14kle,

I just registered to this forum, because after hours of searching, your post makes most sense to me.

I'm going through the same issue with N47 engine, cold start blue smoke for 5seconds max.,oil consumption, oil residue around injectors area on valve cover, breather valve replaced but it doesn't helped, when I disconnected breather pipe at idle it's smoking a lot, so does dipstick tube when dipstick is removed and oil filler cap when it is open, I can feel a lot of crancase positive pressure-blow by from it, oil in intercooler and in both intercooler pipes,checked turbo shaft there is no movement, but there is oil residue probably coming from breather pipe which is connected to air filter pipe which is then connected to turbo compressor side, from there sucked into the turbo and expelled through the intercooler back into Manifold and then burned in combustion whilst the boost from turbo is passing through injector valve cover gaskets into the pcv valve cover system. One thing which bothers me is why there is that blue smoke just on cold start and not during the idle or during the boost? Did you have same cold start smoke issues? Also EGR,DPF is mapped off, fitted with cat box only and is mapped to stage1. Thanks.

[P14kle]

Hi. Not really sure what your post is trying to say?? You have listed pretty much all the issues that indicate a valve cover gasket failure that I had on an M47 320d. You dont however say if you have changed it yet to see if it resolved your issues??

If not, my point was saying to try changing it to solve the issues stated in the thread started. This was for an M47 and you also mention you have an N47 which I know nothing about tbh other than they quite different in their egr/breather layout etc.

I had and still have a puff of blue smoke on start up as my car is fully deleted emissions wise. I have no oil consumption though after changing the Valve Cover Gasket out a few years ago. Its a relatively cheap part, and a few hrs labour if you are any good with the spanners, so worth a try in my opinion.

Hope this helps!?