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The Full Story On Cam Adjusters And Lifters

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Old 09-02-2015, 10:47 PM   #1
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The Full Story On Cam Adjusters And Lifters

I think we should do the best we can to clear this issue up.

I am a Benz tech and have done cams, lifters, and adjusters on the 6.2. I have seen the cam/lifter failure on engines that should be okay per their engine vin number, but they are suffered the failure. When your getting the constant valve train noise, remove the valve cover, and take a look. It is a pretty easy one to figure out.

Cam adjusters on the other hand have me wondering what is "normal" and what would be considered problematic. I know these cars when new did not make the chatter on start. This is for sure. I have done all four adjusters on an E63 with 100k on it, and I would get 20 degrees of crank rotation before the intake cams would move. New adjusters and the engine stayed in time. Also this engine would pass the adjuster test using an SDS before the adjusters were replaced.

Has anyone had catastrophic engine failure due to a cam adjuster on a 6.2? My car has 108k on it and will occasionally make adjuster noise on start. It will never do it for more then a second. It seems people are having adjusters replaced, and then a few thousand miles later are having noise again.

I have read the L.I. documents, but would like to get some feedback from MB techs or people who have first hand experience. On a side note, I'm also curious if the adjusters not fully advancing timing is the reason some 63s make much more or less power then an identically modified car.

Lets hear what you guys think.
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Old 09-02-2015, 11:21 PM   #2
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Quote:
Originally Posted by layzie12g View Post
I think we should do the best we can to clear this issue up.

I am a Benz tech and have done cams, lifters, and adjusters on the 6.2. I have seen the cam/lifter failure on engines that should be okay per their engine vin number, but they are suffered the failure. When your getting the constant valve train noise, remove the valve cover, and take a look. It is a pretty easy one to figure out.

Cam adjusters on the other hand have me wondering what is "normal" and what would be considered problematic. I know these cars when new did not make the chatter on start. This is for sure. I have done all four adjusters on an E63 with 100k on it, and I would get 20 degrees of crank rotation before the intake cams would move. New adjusters and the engine stayed in time. Also this engine would pass the adjuster test using an SDS before the adjusters were replaced.

Has anyone had catastrophic engine failure due to a cam adjuster on a 6.2? My car has 108k on it and will occasionally make adjuster noise on start. It will never do it for more then a second. It seems people are having adjusters replaced, and then a few thousand miles later are having noise again.

I have read the L.I. documents, but would like to get some feedback from MB techs or people who have first hand experience. On a side note, I'm also curious if the adjusters not fully advancing timing is the reason some 63s make much more or less power then an identically modified car.

Lets hear what you guys think.
Mine are getting replaced as we speak. I will let you know if the sound comes back. If it does I don't know might just be the way it is. Wondering the same does the noise really matter as long as no damage will result. It's only in start up no other noises any other time and only for a second or 2.
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Old 10-11-2015, 10:25 PM   #3
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Although not all that technical, it's too technical for this forum.

The locking pin cleaning sounds interesting though. Wonder if it's affected by the amount of detergents in the oil used and or change interval?
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Old 10-12-2015, 01:33 AM   #4
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The adjusters aren't very complicated, oil pressure fills passages up to either retard or advance the cams. The noise, on start up, I assume would be the adjuster loosing oil from a worn seal causing the metal to clatter together till oil pressure builds.
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Old 10-12-2015, 07:39 PM   #5
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I was hoping the M156 would be a reliable engine once the head bolts issue is taken care of. Unfortunately, it seems like there are plenty other issues. Maybe the only reliable ones are via M159?
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Old 10-12-2015, 08:05 PM   #6
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my car does make a strange chattering noise on startup sometimes. but most times it starts up normal. is this the same thing you're talking about? i'm out of warranty, is this something i should get fixed?
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Old 10-12-2015, 08:27 PM   #7
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look up the thread titled "this noise can't be normal"

dealer replaced my cam adjusters. whirring noise is gone. car has 25k on it
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Old 10-12-2015, 10:26 PM   #8
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Has anyone had a failure related to failed adjusters or just the noise?
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Old 10-12-2015, 10:36 PM   #9
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Quote:
Originally Posted by solekeeper View Post
look up the thread titled "this noise can't be normal"

dealer replaced my cam adjusters. whirring noise is gone. car has 25k on it
That noise is completely diff then what is being talked about. That noise very surprised was cam adjusters. I have heard similar odd noises like that come and go. I've had my cam adjusters replaced last month guess what both noises still heard. 3 m156 engines at the dealer had same inititial start rattle. These cars are just noisy is what I'm starting to think. I had my oil changed and supposedly had an incorrect size oil filter in place. after it was changed sounds decreased significantly but yes still there on warm oil starts after 40 or so minutes. But it is a lot better. The adjuster replacement had zero impact on improving noise.

Last edited by AMGonFire; 10-12-2015 at 10:41 PM.
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Old 10-12-2015, 10:40 PM   #10
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This was my M156
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Old 10-12-2015, 10:43 PM   #11
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This was my M156
That must be PFL with the soft cams and lifter issues correct?? What were your symptoms?? Constant ticking??
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Old 10-12-2015, 10:51 PM   #12
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That must be PFL with the soft cams and lifter issues correct?? What were your symptoms?? Constant ticking??
09 C63 No ticking noise.
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Old 10-12-2015, 10:53 PM   #13
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Originally Posted by solekeeper View Post
look up the thread titled "this noise can't be normal"

dealer replaced my cam adjusters. whirring noise is gone. car has 25k on it
When is the whirring noise evident ? I have it to but only at idel but might be normal
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Old 10-12-2015, 11:10 PM   #14
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I have a ticking noise from the left bank after the car sits at the airport for 2 weeks. Noise is gone by the time I pull out of the parking deck.
When the car is driven every day or every other day, it never makes a sound
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Old 10-13-2015, 07:45 AM   #15
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When is the whirring noise evident ? I have it to but only at idel but might be normal

only after i drive the car and then have it sit for 2-3 hours. makes that noise for about 20 seconds then goes away. as i said before, one dealer said it was normal, the other changed the CA's and i have not heard the noise since.
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Old 10-13-2015, 09:36 AM   #16
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only after i drive the car and then have it sit for 2-3 hours. makes that noise for about 20 seconds then goes away. as i said before, one dealer said it was normal, the other changed the CA's and i have not heard the noise since.
The CAs?
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Old 10-13-2015, 09:40 AM   #17
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The CAs?
Cam Adjusters
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Old 10-18-2015, 08:03 AM   #18
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I'm another owner in Calgary and my 2009 with 92,000 km started getting noisier with the defective buckets about 20,000 km ago and is getting really annoying now. I will post my dealings with Mercedes re this issue.
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Old 10-18-2015, 08:14 AM   #19
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Oh, forgot to mention I just wrote in another post here I also have been dealing with the Adjustor/Actuator issue since last year. After a cold tough winter of short trips and not being able to use my garage (Severe service that will create sludge in the engine) I started to get the Adjuster rattle for a second or two on start up. (Cold and hot) The dealer told me I needed 4 adjusters and actuators for $5600.00 but I cleared most of it up with an engine flush. I only get maybe a half a second of rattle now once every 30 start ups.
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Old 10-18-2015, 09:20 AM   #20
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How did you do an engine flush? Sea foam or similar?
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Old 10-18-2015, 01:03 PM   #21
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I'm another owner in Calgary and my 2009 with 92,000 km started getting noisier with the defective buckets about 20,000 km ago and is getting really annoying now. I will post my dealings with Mercedes re this issue.
This is unrelated to cam adjuster or the noise
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Old 10-18-2015, 09:07 PM   #22
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I have a 2013 and had the noise at start up both warm and cold. Dealer replaced a cam adjuster and the noise returned after a few weeks. I took the car back and was told its normal. Its hard to believe that could be normal. I am planning to go back in for oil service and will mention it again.
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Old 10-18-2015, 09:21 PM   #23
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it might be normal for them but it is not NORMAL for other engines.
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Old 10-18-2015, 09:33 PM   #24
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Having owned my car for a few years and having utilized the warranty/ELW to the maximum, I am realizing that this car is chock full of noises!
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Old 10-18-2015, 09:50 PM   #25
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Quote:
Originally Posted by naptownmike View Post
I have a 2013 and had the noise at start up both warm and cold. Dealer replaced a cam adjuster and the noise returned after a few weeks. I took the car back and was told its normal. Its hard to believe that could be normal. I am planning to go back in for oil service and will mention it again.
Good luck dealers truly have no idea what it is and this motor does make a lot of noises I think if no cel car pulls strong they say it's normal prob isn't but I deal with the occasional 1 second of noise
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