One Reason BMW N47 N57 Will Catch Fire. Massive Valve Cover Oil Leak - It Can Be Prevented!

Update on this repair: Oil leak problem solved.
Will keep you updated

[@rebekak5555]

Thank you for the video, very useful to know!

[@W15Garage]

Thanks for watching

[@alexcucala3657]

A tip: Don't start directly the car after removing the injectors, because piezo inyectors working without diesel will cause them to fail, so, crank the car with the electric conection of the injectors unplugged

[@W15Garage]

@@alexcucala3657 thanks for watching! You’re absolutely right. I didn’t recorded everything in this video, what I like to do is with my Autel connected i purge the air, 4-5 times, than with the injectors disconnect 3-4 times cranking, this also helps to build up some oil pressure after oil changes. 535d and the 40d range have the piezo injectors, thanks God mines are bosh, much cheaper to replace if needed.😄

[@Mixy88]

Great Tips Thanks!

[@W15Garage]

Thanks for watching!

[@user-ef5ec7bb1l]

Nagyon jó videó , köszönet érte.🥰

[@W15Garage]

🙏

[@Shortex883]

True!

[@W15Garage]

Thanks for watching!

[@Ricardo_Caracol]

Excelent vídeo, very well explain and i 100% agree with you....mery christmas

[@W15Garage]

Thanks for watching!

[@chrisgermann6658]

Plastic valve covers ...what could possibly go wrong. i had to replace mine due to warping. They use way too much plastics these days under the bonnet/hood.

[@Jotomoz]

Not just covers. Sumps now too on benz. Of all makers Benz

[@chrisgermann6658]

@@Jotomoz its pathetic but then these brands tend to bow mainly to the lease market so cost cutting would explain the materials used.

[@W15Garage]

Since the replacement, no more oil leaks

[@alancutchey9892]

Wouldn’t be a bmw if didn’t leak oil.. or overheat. The newer the cars the worse they get sadly

[@W15Garage]

Thanks for watching. The new valve cover fixed the issue.

[@wayneparr3066]

Great video . Do you use new injector bolts afterwards ? Or reuse the originals , thanks

[@W15Garage]

Thanks, I’ve always reused them, so far no issues, but the bolt holes are always sparking clean before installing.

[@straight_to_the_point7869]

Thank You for this video, i am about to replace valve cover as well, because gaskets around injectors is passing oil on top of the cover, timing chain was changed so valve cover was already opened once, i dont want to risk it to replace just gaskets and seals, i will replace complete valve cover like you did. Is it possible that valve cover leak can cause excessive blow-by with oil consumption and cold start blue smoke which is less than 5sec.?, checked turbo and compression all ok car perform well, egr is mapped out, downpipe installed and remapped. Many Thanks.

[@W15Garage]

Hi, thanks for watching. I’ve had a pretty bad valve cover oil leak, but there was no blue smoke at start up. What I’ve experienced though is that turbos can leak oil despite the shafts being ok, and not having excessive play, when hand checked. A leak down test could also be useful in this case. Do you also experience oil consumption between oil changes?

[@straight_to_the_point7869]

@@W15Garage Many Thanks for your response, I understand and you might be right with the turbo issue, that it may leak without play in the shaft, but the smoke come just at cold start up and just for few seconds, otherwise there is no blue smoke or loss of performance, seems to me that the issue might be in valve cover leak, I try to explain why I think that: As turbo is pushing compressed air through intercooler then through shudder valve into the intake manifold the boosted air is passing through leaky valve cover gasket (injector gaskets area) into the breather valve which is integrated with valve cover and pushes the oil residues by blow-by through the breather pipe which is connected to air pipe and which is connected to turbo compressor wheel side then the oil is sucked in to the turbo, therefore oil from breather get into turbo housing and it pushes it's oil through intercooler into intake manifold and finally into the combustion chamber where is burn hence blue smoke and as it is engine left for a few hours oil residue is collected for first start up hence the smoke on start up...sorry for long explanation, but seems to me you have lot of experience with these engines, could this be a correct theory why car is smoking on start up and loosing oil? Regarding your question about oil consumption between oil changes, this oil consumption and smoke started just a few weeks ago and it is not extreme, I would say I am loosing about 200ml every 1000km, and there is oil residue in intercooler and both intercooler pipes. Leak test is a good idea. Thank You for taking a time to read this.

[@W15Garage]

@@straight_to_the_point7869 Absolutely no problem! In my opinion it’s either the turbo, or slightly stuck piston oil rings. The combustion compartment doesn't communicate with the upper chamber (camshaft area). The injectors are sealed by copper o-rings, and even if the valve cover injector oil rings are leaking out oil in the injector holes(valve cover holes), they are not in contact with the combustion system. These leaks can cause oil to escape, but there is no compression present in that area. The turbo creates boost, and via the intercooler and throttle body, compressed air gets into the combustion chambers. The valve cover is one floor up from this system, injector o rings are not responsible for holding compression. If there is crankcase pressure under the valve cover, it is likely due to bad oil piston rings. Leaky valve cover gasket can cause oil leaks, it is not responsible for introducing oil into the combustion system or causing blue smoke. Sorry for the long message😊

[@straight_to_the_point7869]

@@W15Garage Thank You very much for taking a time to help me out and advise me in this N47 problem. I will do my best to find and fix this issue best I can if I can. You are one of the best while being down to earth here on youtube, I do like your channel very much. Thank You.👌👍

[@charlescollins5150]

Do you only use a genuine bmw rocker cover or would you be happy to use a non genuine one?

[@timbo19751975]

OE Beru or Genuine only. They're not expensive.

[@W15Garage]

I would recommend original. The one I’ve installed is a no name from ebay. I want to test how it performs. But If you’re paying for labour, original is the smart choice

[@arturka1235]

So did the ebay one sort the problem out?

[@user-pt4ex2vn5l]

I have a oil leak from opposite side that I haven’t been able to trace does it happen left and rightside thanks

[@W15Garage]

Yes it can leak left and right, but most commonly rear corner diver side

[@piovo5222]

If it’s near the right side but in the middle kind of it can be the oil filter housing gasket.

[@user-pt4ex2vn5l]

@@piovo5222 thanks for the reply i did check round the filter but I’ll double check cheers 👍

[@Romangal2701]

Nice one. Which brand of timing kit would you recommend please

[@W15Garage]

@@Romangal2701 thanks for watching! I would recommend original, or IWIS(manufacturer of the bmw chains) FEBI also a good brand. With the cheaper ones the plastic guides are the real risk..they would deteriorate with time, small pieces will fall down the oil pan, and clog the oil pump pick up tube, causing oil starvation.

[@Romangal2701]

@@W15Garage thank you very much

[@Romangal2701]

@@W15Garage any links to order please. I have 2014 330d thank you in advance.

[@W15Garage]

I’m using autodoc, sometimes local parts shop. I would like to point out some sellers description states n47 n57 compatibility is the same but it’s not. N57 has larger fuel pump sprocket.

[@mihaistinga2525]

Hi i have the same problem how much it can cost approximately in uk so i don’t get over charged? Thanks

[@W15Garage]

Hi, unfortunately, I don't know. As a hobbyist, I'm doing the repairs for myself, so I'm not familiar with prices.

[@momor7786]

That what I want know because I ve changed but still leaking on DPF !!!

[@W15Garage]

@@momor7786 In my case problem was sorted with the new cover, up to date zero oil leak.

[@momor7786]

@@W15Garage I've passed my hand on back of the cover but no oil !! ...I have oil burn on DPF but I cannot find where comes from !!

[@W15Garage]

@@momor7786 the only two places oil can leak in that area is the valve cover or timing chain tensioner.

[@momor7786]

@@W15Garage thanks for your replay. I ve checked on the back of cover nothing is clean. But I hav oil comes on DPF, starter and gearbox have a lot of oil ? Do you have an idea ? Timing tensioner how can leak oil ?

[@W15Garage]

@@momor7786 upper timing tensioner has metal o ring(similar to oil drain bolt) in rare cases it can leak oil from the inside, but i doubt it is the case. I think it’s the valve cover leaking somewhere.