C300 engine noise
Newbie
Joined: Aug 2012
Posts: 12
Likes: 0
From: miami fl
C300
noise cold start
Add me to the list of knock-knock-knocks. Although mine is more noticeable after a 4-6 hour break, not so much overnight. Go figure. I use M1 0w40 Euro Formula, mileage just over 30K.
It's not getting any worse, but if there is something that can be done (short of tearing into the engine) I'm game. Check valve, sensor, whatever.
No warranty for me... I am my own warranty!
It's not getting any worse, but if there is something that can be done (short of tearing into the engine) I'm game. Check valve, sensor, whatever.
No warranty for me... I am my own warranty!
Newbie
Joined: Aug 2012
Posts: 12
Likes: 0
From: miami fl
C300
noise
I just took mine in to Mercedes of Alexandria. It knocks really bad. I laugh when I see the comemrical on TV about Mercedes and the founder's motto was "only the best". This knock sound is terrible. I've had my car for 1 year now and it's been there ever since I bought it CPO and getting worse
I hope they don't tell me it's normal. If they don't address it I'm filling complaint with NHSTA (which you all should do), and contacting MB of USA and Germany every week and taking into to the dealership until they correct it. I"m not going to let it go until they address it. Yeah that's how annoyed I am right now.
I hope they don't tell me it's normal. If they don't address it I'm filling complaint with NHSTA (which you all should do), and contacting MB of USA and Germany every week and taking into to the dealership until they correct it. I"m not going to let it go until they address it. Yeah that's how annoyed I am right now.
Newbie
Joined: Jul 2012
Posts: 2
Likes: 0
2009 C300
Pretty much was rod knock. The bearings can be swapped from underneath by dropping the pan. I guess I got a free oil change out of it.
Newbie
Joined: Aug 2012
Posts: 12
Likes: 0
From: miami fl
C300
problem corrected...not only a free oil change but tranny fluid, new gaskets and bolts....ladies and gents the answer is oversize bearings that are accessible thru the bottom of the engine, my car was at the dealer for 9 days and the problem is solved..ps make sure they do the transmission software upgrade in order to do away with the transmission delay while changing gears
Last edited by raspu; Oct 16, 2012 at 06:29 PM.
Junior Member
Joined: Sep 2012
Posts: 22
Likes: 0
From: PA
08 c300 sport 4matic
excuse my ignorance on this topic. I tried following it for the past 4 pages, but i dont know what sounds u are talking about.
is it similar to this noise?
cause mine makes this noise, and its kinda freaking me out.
is it similar to this noise?
cause mine makes this noise, and its kinda freaking me out.
Junior Member
Joined: Sep 2012
Posts: 22
Likes: 0
From: PA
08 c300 sport 4matic
ahhhh...thanks for the video. yeah..i dont have that, wow thats annoying. at least that's only for a few seconds. mine is a constant ticking. i think i have the infamous purge valve.
Newbie
Joined: Aug 2012
Posts: 12
Likes: 0
From: miami fl
C300
cold engine start/ after sitting for 45min warm start
MY CAR A C-300 BENZ HAD IT DONE BY THE DEALER AND IT TOOK THEM 8-9 DAYS TOLERANCE INADEQUATE W/8429 PERFORMED NOISE LOCATION TEST ORDER TO DETERMINE LOCATION, FOUND COMING FROM LOWER END, FOUND NEEDING CRANK BEARING REPLACEMENT
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Newbie
Joined: Aug 2012
Posts: 12
Likes: 0
From: miami fl
C300
NOISE
excuse my ignorance on this topic. I tried following it for the past 4 pages, but i dont know what sounds u are talking about.
is it similar to this noise?
http://www.youtube.com/watch?v=3AOgy13HWhk
cause mine makes this noise, and its kinda freaking me out.
is it similar to this noise?
http://www.youtube.com/watch?v=3AOgy13HWhk
cause mine makes this noise, and its kinda freaking me out.
THIS IS SOMETHING ELSE...DOES NOT SOUND GOOD.
Newbie
Joined: Aug 2012
Posts: 12
Likes: 0
From: miami fl
C300
COLD START ENGINE NOISE
We leased a C300 two weeks ago. Has about 450 miles on it. Since it was new, it has a cold start noise that is troubling. Like it's low on oil. Not really a tappet noise though, more like a bearing noise. Noise sounds "throatier". Goes away in about 3-5 seconds. Only happens in the morning after she sits overnight. Oil level is correct. No other symptoms. We are south Texas so it is hot. Garage gets over 100 degrees regularly. Could it be the timing chain?
ENGINE BEARINGS, TOLERANCE INADEQUATE W/8429 ...REPLACE ENGINE CRANK BEARINGS AND INCREASED SIZE AS PER SHEET.NOISE COMING FROM LOWER END, MUST PERFORMED NOISE LOCATION TEST, 8-9 DAYS AT DEALER. GOOD AS NEW
Newbie
Joined: Aug 2012
Posts: 12
Likes: 0
From: miami fl
C300
NOISE
Hey Guys,
I have the crank knock issue as well. I'm certain that it is a crank / rod related noise.
Just for reference, I'm a Mechanical Engineer and I work on large rotating machinery, we have 16Mw motor generator sets with 70+" diameter journal bearings, and we service several thousand HP worth of Screw Helium compressors. Plus I raced oval track cars for 5 years in my youth, and I have blown up motors before and know what it sounds like. I'm not tooting my horn, I just want to qualify my opinion.
Mine was mostly a hot start issue only. and only after it sat for more then 2 hours. But now it occasionally happens on cold (room temp) start up as well. It really bugs me, but I have great faith in MB, if they tell me it's normal, I'm just going to keep driving it like normal. They have been at this for over 100 years so I know they know how to make engines. Meanwhile I'll keep logging complaints at the dealer every time I go in.
RickP
I have the crank knock issue as well. I'm certain that it is a crank / rod related noise.
Just for reference, I'm a Mechanical Engineer and I work on large rotating machinery, we have 16Mw motor generator sets with 70+" diameter journal bearings, and we service several thousand HP worth of Screw Helium compressors. Plus I raced oval track cars for 5 years in my youth, and I have blown up motors before and know what it sounds like. I'm not tooting my horn, I just want to qualify my opinion.
Mine was mostly a hot start issue only. and only after it sat for more then 2 hours. But now it occasionally happens on cold (room temp) start up as well. It really bugs me, but I have great faith in MB, if they tell me it's normal, I'm just going to keep driving it like normal. They have been at this for over 100 years so I know they know how to make engines. Meanwhile I'll keep logging complaints at the dealer every time I go in.
RickP
Newbie
Joined: Dec 2012
Posts: 1
Likes: 0
From: South Florida
2009 C300
2009 C300 cold start noise too
LEAVE THEM YOUR CAR... ASK THE DEALER ABOUT W/8429 CRANK BEARING REPLACEMENT, COMING FROM LOWER END NEEDS CRANK BEARINGS REPLACED WITH AND INCREASED SIZE AS PER SHEET... QUOTE FROM MERCEDES BENZ WORK SHEET.. I WAS READY TO RETURN CAR 09 C300 WITH 40000 K CERTIFIED VEHICLE IF UNABLE TO FIX. EXCELLENT DEALER
My 2009 C300 is having the same noise cold start issue.Still have a few months of factory warranty left. I see in your profile Miami .I'm located here in South Florida too..to what MB dealer do you take it for the fix ? planning to take mine to the same dealer as yours... Thanks !
Super Member
Joined: Nov 2008
Posts: 604
Likes: 29
From: SA
2008 C350-Sport-AMG-Active Agility Pack(Not reliable) +Izuzu KB6 3L(It seems Reliable)+Mazda
Engine noise at startup
Damn, that is the noise at startup I was talking about. Myne was quiete for a time but came back. Cold or warm. It going for a very long time, nothing broken yet.....77 000Km. Got clean bill of health after EISH was replaced(2-weeks at dealer).
I hate a MERC engine sounding like the old Ford V6's at startup.Must say this was a Merc disappointment for me, although I liked the car.
Thinking about what I should do, still in full guarantee(Extended).
I hate a MERC engine sounding like the old Ford V6's at startup.Must say this was a Merc disappointment for me, although I liked the car.
Thinking about what I should do, still in full guarantee(Extended).
MBWorld Fanatic!
Joined: Oct 2010
Posts: 1,128
Likes: 19
From: Acapulco Mexico
2010 C300 Sport
One wonders if you should just leave it alone. From most comments, MB dealers service departments leave a lot to be desired. Imagine pulling the engine (not sure if this can be done from below), opening the crankcase, undoing all the rods, removing anything driven by the front of the crankshaft, pulling the crankshaft...
After THAT, swapping the bearings, installing the crankshaft and all the stuff that it rotates, reconnecting the rods, and torquing everything up to factory spec, closing up the engine and seals in "clean room" conditions, and reinstalling the engine with all that entails?
And one expects that after all THAT, the C300 engine will be BETTER OFF than before? No way, IMO. If your W204 has taken you 80k miles already, most likely it will go another 80k.
I am thankful that my C300 engine is SO QUIET on startup, I have the habit of lowering the window just to make sure. There are bigger issues with the life and reliability of the W204, and that affect the driver's pleasure every mile, like the LAME 7G TRANSMISSION, 4Matic problems, starter switch and electrical issues. Recommend enjoying your C300 just as it is, get other issues resolved while still in warranty.
After THAT, swapping the bearings, installing the crankshaft and all the stuff that it rotates, reconnecting the rods, and torquing everything up to factory spec, closing up the engine and seals in "clean room" conditions, and reinstalling the engine with all that entails?
And one expects that after all THAT, the C300 engine will be BETTER OFF than before? No way, IMO. If your W204 has taken you 80k miles already, most likely it will go another 80k.
I am thankful that my C300 engine is SO QUIET on startup, I have the habit of lowering the window just to make sure. There are bigger issues with the life and reliability of the W204, and that affect the driver's pleasure every mile, like the LAME 7G TRANSMISSION, 4Matic problems, starter switch and electrical issues. Recommend enjoying your C300 just as it is, get other issues resolved while still in warranty.
Super Member
Joined: Nov 2008
Posts: 604
Likes: 29
From: SA
2008 C350-Sport-AMG-Active Agility Pack(Not reliable) +Izuzu KB6 3L(It seems Reliable)+Mazda
Windows closed
My windows are always closed, I hear it in the cabin if radio is not on.
I noticed the other day at dealership, they may not hear it well with building general noise, but in my garage I hear it clearly, as well as away at parkings.
I think I started hearing it around the 20 000km service, around there.
I have a mazda which started a noise(Rocker-type of a noise, not tappet, not bearing) at new 7 000km. It still runs at 259 000Km, nothing seized or broken.
Lets see what the dealer say, I logged a complaint, asked them to get the facts from factory engineers about this.
I always said to myself, no..not a Ford, please!!!.
I noticed the other day at dealership, they may not hear it well with building general noise, but in my garage I hear it clearly, as well as away at parkings.
I think I started hearing it around the 20 000km service, around there.
I have a mazda which started a noise(Rocker-type of a noise, not tappet, not bearing) at new 7 000km. It still runs at 259 000Km, nothing seized or broken.
Lets see what the dealer say, I logged a complaint, asked them to get the facts from factory engineers about this.
I always said to myself, no..not a Ford, please!!!.
Super Member
Joined: Nov 2008
Posts: 604
Likes: 29
From: SA
2008 C350-Sport-AMG-Active Agility Pack(Not reliable) +Izuzu KB6 3L(It seems Reliable)+Mazda
Knock-Nothing documented by Mercedes
Bottom end knocks upon startup:read this...
http://www.justanswer.com/mercedes/5...n-startup.html
Answer, parts of it......
Hi, I think I am familiar with the noise you are referring to if it is a knock on initial start up that lasts a couple of seconds. The noise is characteristic of the M272 motor. I believe it comes from the timing chain system. Mercedes has not deemed it to be a problem and there are no service bulletins on the matter.
eurotec : You might try going to a 5W40 motor oil if you are using 0W30 or 0W40 currently.
eurotec : I do not believe that it is a rod bearing noise and the main bearings would not cause a noise like that.
The variable valve timing mechanisms can knock on initial start up. That is where I think the noise comes from. I do not think the rod bearings would only be noisy on start up. If you had a clearance issue you would also have the noise when you tromp the accelerator.
I think the reason is that Mercedes factory does not or has not seen this to be a problem. I can tell you that I have heard the noise on a lot of the M272 motors. I think it has more to do with the light oil and the valve timing mechanisms than it does the bearings. Knocks from the VVT are not unusual on vehicles that use the system.
I agree that something should be put in writing. Even if they simply explain the noise. They problem is that most likely they probably don't have a field repair fix for it.
Yes I think that there is a very good chance that if you replaced the vvt mechanisms you would quiet the noise. It's also a very costly proposition to do so.
http://www.justanswer.com/mercedes/5...n-startup.html
Answer, parts of it......
Hi, I think I am familiar with the noise you are referring to if it is a knock on initial start up that lasts a couple of seconds. The noise is characteristic of the M272 motor. I believe it comes from the timing chain system. Mercedes has not deemed it to be a problem and there are no service bulletins on the matter.
eurotec : You might try going to a 5W40 motor oil if you are using 0W30 or 0W40 currently.
eurotec : I do not believe that it is a rod bearing noise and the main bearings would not cause a noise like that.
The variable valve timing mechanisms can knock on initial start up. That is where I think the noise comes from. I do not think the rod bearings would only be noisy on start up. If you had a clearance issue you would also have the noise when you tromp the accelerator.
I think the reason is that Mercedes factory does not or has not seen this to be a problem. I can tell you that I have heard the noise on a lot of the M272 motors. I think it has more to do with the light oil and the valve timing mechanisms than it does the bearings. Knocks from the VVT are not unusual on vehicles that use the system.
I agree that something should be put in writing. Even if they simply explain the noise. They problem is that most likely they probably don't have a field repair fix for it.
Yes I think that there is a very good chance that if you replaced the vvt mechanisms you would quiet the noise. It's also a very costly proposition to do so.
MBWorld Fanatic!
Joined: Oct 2010
Posts: 1,128
Likes: 19
From: Acapulco Mexico
2010 C300 Sport
So only the bottom bearing is replaced? That may take out the slack, but it will also cause excess stress and wear on the very center of the top bearing. Will post a picture of this engineering problem later.
Newbie
Joined: Sep 2014
Posts: 9
Likes: 0
From: WNY
Current: 08 C300 Sport 4matic Previous: 2008 Saab 9-3 fully loaded- Sold
Hey gang- I've git the same 3-5 sec knock when starting up cold but car runs fine other than that. I just had the 20k service done and I'm wondering if they replace the stated crank bearings during that service. I wouldn't think they would go that far for a standard B service but I didn't notice the noise before that. Also- what should I expect to pay to swap out the bearings to the larger size if I feel so inclined? Thanks
Newbie
Joined: Aug 2015
Posts: 1
Likes: 0
C300
new member here. My c300 started making loud tapping sounds on cold start up after just 2,000 miles. It lasted for about five minutes then went away. It was more pronounced when I took my foot off the gas pedal. Dealer checked it and on advice from factory changed oil and filter. They found debris. Problem persisted. Factory said it would take 6 weeks to discover a fix but it was fine to keep driving until then. Apparently they needed to wait for parts. Eventually dealer replaced pistons, con rods and shell bearings. I visited the shop while it was in process and the entire engine was out and completely disassembled. My confidence in the motor is shattered! I complained to MB that possible long-term damage may have occurred to the cylinders and wanted an extension on warranty. They have offered to increase an extra year and up to 75,000 miles. I've put another 1,000 miles on it since the fix and so far so good. No more tapping but I am surprised at how noisy the engine is in general though.
Newbie
Joined: Jun 2016
Posts: 5
Likes: 0
C300
Has anybody just left the noise alone and made it to higher mileage, or tryed a heavier cold weight oil? The idea of the car knocking has me worried but I want to believe mb wouldn't put wrong spec bearings in their engines and expect them to be fine. I tend to believe that the noise isn't the end of the world since I've heard older small blocks make far worse noises and be fine for miles and miles but I'm not sure I can afford to rebuild this engine and don't want to tackle it in my garage
Super Member
Joined: Apr 2008
Posts: 765
Likes: 171
From: Walnut Creek, CA
325Ci, 325Cic, C300
Has anybody just left the noise alone and made it to higher mileage, or tryed a heavier cold weight oil? The idea of the car knocking has me worried but I want to believe mb wouldn't put wrong spec bearings in their engines and expect them to be fine. I tend to believe that the noise isn't the end of the world since I've heard older small blocks make far worse noises and be fine for miles and miles but I'm not sure I can afford to rebuild this engine and don't want to tackle it in my garage
I think you'll be fine.
