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In recent weeks I've noticed oil on the drive and read numerous posts about oil leaks - none of which were my issue. It presented the same as the leak from the plugs on the back of the engine. However, this was dry and clean. So, I went looking for it. A few hours later after removing all of heat diffusers I found it.
I'm reasonably confident its this hard line that comes from the front upper side of the engine and goes down to the turbo.
Does anyone know if its just a seal or a full replacement of the pipe? Anyone happen to know part numbers?
Oil feed line A2710900477
O-ring A0239978548
Banjo bolt A0019972401
Banjo seal N000000006513
The o-ring may have failed or the oil-feed line may have cracked. It feeds oil at full pressure to the turbo beating.
If you take it off you must replace all the seals and the bolt to the turbo. Your MB dealer parts guy will advise.
Bolt to cylinder head is 9nm.
Bolt to turbo is stretch (replace) 6nm + 90deg
thanks, will order the line instead of the o ring to save some trouble. what's not leaking at this moment!! 3 years ago, the coolant feed line, last year, the air hose coupling, now the turbo oil line, -- pretty much everywhere with pressure and plastic/rubber! oh, the back of the engine has leaking as well! need to check if it's the valve cover gasket.
to the mercedes engineers, how inspiring it is to design a legendary piece of junk that leaks at every possible place.
Originally Posted by elodesignco
replaced the line (oil seal is attached to it) and the banjo bolt. problem was fixed.
use the photos above to get the job done. you'll have to remove the heat shroud first.
I had my line go at 120,000kms and am at 150,000 know. have just done engine mounts(3), rotor and caliper replacement, plugs, coils. have had a coolant leak in the upper hard line running along the top of the block. I'm now looking at possibly a water pump or alternator replacement. all things I'd expect to be dealing with at this age and kms.
the turbo oil line, which this thread is about, has nothing to do with exhaust smoke.
also, the parts used are further up the thread for reference.
actually many have had to replace the banjo bolt which is in conjunction with the oil line due to smoke from the exhaust at startup. Thanks anyways mate.
Just wondering when you ordered the new oil return line for the turbo, did it come with all the seals and new banjo bolt? Is that the only part I have to order, or do I need to order all separately? Thanks!
the line has the seals on it. the banjo is a separate part. make sure you get the newer bolt with backlog device in it. you can find those on ebay.
I know this is a well known manufacturer. Does this banjo bolt look like the correct one? It says it fits, and that it prevents the oil leak, but I just wanna get yours (or others) opinions to make sure it's the right updated one. https://shop.mambatek.com/Turbo-Oil-...-K028-0032.htm
the line has the seals on it. the banjo is a separate part. make sure you get the newer bolt with backlog device in it. you can find those on ebay.
This is what I was going to order. It looks like it has a banjo bolt in it already. But would it be better to buy the other banjo bolt from mamba and just install it on this line to make sure it won't leak? https://www.ecstuning.com/b-genuine-...ne/2710900477/
Having discovered an oil leak leaving oil dripping from the alternator, right side of the engine block and underneath the oil pan, it was hard to locate where it came from at first. My car is a CGI 250 1/2011, 104000km. Searching the net I finally found your description and changed the feed line from the engine block to the turbo according to your guidance. At first the local MB dealer, a large company, said just "bring the car in", they had never heard of such a leak. I decided to pay the 35EUR for the spare part and replace it myself - problem solved. Thank you.
My pictures are just to add to your otherwise well covered description. The new part is delivered with a yellow plastic cover that fits tight and protects the thick o-ring which as new has a grey colour. I tried to fit that cover on the old o-ring but it just fell off which means the old o-ring has lost in diameter and thus its sealing ability. The black shiny area on the o-ring shown is where the old o-ring has lost contact and the grey area shows where there still has been contact.
Hey everyone, appreciate the detail. Mine does have a leak on the side of the engine but I also have a small oil pool on my turbo heat shield (not pictured but would be on left of photo) that I can’t locate the source. My banjo bolt looks clean, could the lower oil return lines be the culprit? The actual turbo? They appear oily in my photo. Thanks.
Hey everyone, appreciate the detail. Mine does have a leak on the side of the engine but I also have a small oil pool on my turbo heat shield (not pictured but would be on left of photo) that I can’t locate the source. My banjo bolt looks clean, could the lower oil return lines be the culprit? The actual turbo? They appear oily in my photo. Thanks.
Hi. If your car hasn't had the turbo feed line changed before, I would start there because it has the O-ring. It's a fairly easy job, just follow the procedure described in this thread. Remember torque settings are important. Renew the feed line first, run the car for a while and then tjek for tightness, that is, see if there's any oil on the right side and on the front of the engine. If oil is still there I would move to the oil return, which is underneath the turbo. It will require a car lift. But, you say that you have seen an oil poodle on the turbo heat shield. Since the oil return is underneath the turbo, and the feed line, with the thick O-ring, is connected to the cylinder head, that is further up, on top, I think the oil originates from there. I changed mine last year and I haven't had any oil leaks since. The engine block is completely dry. You would be surprised to see how much the oil can spread from where the O-ring is located. Comparing your picture with pictures in this thread, I think it's clear that the iron tubing on your picture is contaminated with oil and it comes - that is my guess - from a worn O-ring. Buy the way, the feed line is fairly cheap, I paid about 33 Euro and it came with both banjo bolt and washer on one end and the O-ring in the other and as a DIY, you have saved some valuable coins.
Hey everyone, appreciate the detail. Mine does have a leak on the side of the engine but I also have a small oil pool on my turbo heat shield (not pictured but would be on left of photo) that I can’t locate the source. My banjo bolt looks clean, could the lower oil return lines be the culprit? The actual turbo? They appear oily in my photo. Thanks.
I still had the oil pool on the exhaust shield even after changing the turbo oil line. Changing the valve cover gasket solved the problem.
That makes sense, I just replaced the valve cover gasket in the last few weeks. I assumed this oil was from the turbo line but that may have been the culprit. I do have oil on the intake side of the turbo system as well on the right side. I guess I’m just going to replace all of the normal culprits at this point. At 150k I think Mercedes’ needs to look back at the engineering of any o rings and seals. Still love the car but damn Mercedes’. You guys are the real mvp’s
From my experience, there are four primary sources of oil leaks on the facelift C250 with the M271 engine:
oil feed line o-ring, banjo bolt & seal
air intake hose
cylinder head cover gasket
oil filter housing
It's a little tricky to determine the exact location of the leak from your pictures but I would suggest perhaps the oil filter housing gasket. If so, you will have drips of oil on the undertray as well as a burning oil smell as oil drips or is blown onto the hot exhaust.
From my experience, there are four primary sources of oil leaks on the facelift C250 with the M271 engine:
oil feed line o-ring, banjo bolt & seal
air intake hose
cylinder head cover gasket
oil filter housing
It's a little tricky to determine the exact location of the leak from your pictures but I would suggest perhaps the oil filter housing gasket. If so, you will have drips of oil on the undertray as well as a burning oil smell as oil drips or is blown onto the hot exhaust.
its a right hand drive vehicle, the oil filter is located at the top right hand side of the engine. I dont think it'll be the oil filter housing as the oil leak/resudue is present near the oil feed line and directly below this area.
Nevertheless i'll check the areas you've mentioned.
The oil return line pipe is that a common failure?, its diffucult to see/access any ideas what needs to be removed to gain access? Any guide would be appreciated
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