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C63 rattle from engine

Neil5489 said:
I already said what it was doing. My personal opinion is that it shouldn't rattle at any time, wether cold or warm. But the videos I've watched on YouTube is the exact same noise made at the same time.
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It's hard to "say" a rattle.

Let people have a listen or post the video that is the exact same noise, so those trying to help you have half a chance.
 
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The dealer heard it. They're not saying it's not there. They're saying it's normal. My point is, I've worked in the motor trade for nearly 20 years and I've not heard an engine make any sort of rattling noise upon start up that was ever regarded as normal
 
DuncS3 said:
My 2013 car would do this on occasion - like you said, did not sound great when starting the car. I just left it though tbh as it was quite well reported.
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The tech at mb either couldn't be bothered or just genuinely didn't think it was worth messing with
 
Neil5489 said:
The tech at mb either couldn't be bothered or just genuinely didn't think it was worth messing with
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In such case I would think it makes sense to take your car for an assessment somewhere else so a second opinion. To me as also suggested it could be the cam adjusters / lifters which has been an issue on the M156.
 
Neil5489 said:
Yeah maybe I might have read that wrong!
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No "maybe" about it Neil. Everyone is trying to help. Cool down:D
For what its worth I'd find an MB indy and get a 2nd opinion.
Someone like Acid at MSL in Birmingham who has had more 63 engines through his workshop than you could imagine.
At least your fears could be unfounded should it be a normal occurrence.
 
My 2012 does it too. I've been told it's normal, but an independent suggested it's the cam adjuster. I've booked it into MB for a check then with him afterward should it need the work carried out. To be fair it's not done it for a while and I'm wondering whether it only did it in the first instance as it had been sat for a few months without running. I'm now considering not getting it checked.... decisions decisions. If you live near Dartford/Kent I'm happy to meet.
 
Edwards521 said:
My 2012 does it too. I've been told it's normal, but an independent suggested it's the cam adjuster. I've booked it into MB for a check then with him afterward should it need the work carried out. To be fair it's not done it for a while and I'm wondering whether it only did it in the first instance as it had been sat for a few months without running. I'm now considering not getting it checked.... decisions decisions. If you live near Dartford/Kent I'm happy to meet.
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Thanks for the offer, unfortunately im the other end of the country. Im going to try another merc dealer and get another opinion. Im not overly bothered about the cost. I just want shut of the noise
 
My CL63 also occasionally does it but it's completely random. It seems more common when the car is used for short runs for a few days, after longer runs it vanishes for a while. I discussed it with a specialist and they said not to be concerned as long as there is no rattling/ticking when fully warm.

There us an MB service bulletin that recognises this cold start rattle and does indeed suggest changing the cam adjuster but I have read about others having had this done and it still making the noise - and bearing in mind it's a c£2k job per bank (I have been told) one would need to be certain that it is the solution before embarking on that route. Also, supposedly, 2010 on engines had modifications to prevent it, but judging by some of the posts on here it's happening with cars made after that date.

Other suggested reasons have included the oil filter cartridge not being fitted correctly and dirt/debris blocking a valve in the cam adjusters which was removed by a good engine flush - I have no direct evidence to say either works.

It seems a fairly common issue and the fact that it only does it for a split second after start doesn't particularly worry me, but I am curious to know what part normally prevents the oil from draining away from the cams when the engine is switched off and why it only doesn't work occasionally. Is it, for example, electronically controlled and there's an intermittent supply issue or is it just a positioning issue.
 
Egbert Nobacon said:
My CL63 also occasionally does it but it's completely random. It seems more common when the car is used for short runs for a few days, after longer runs it vanishes for a while. I discussed it with a specialist and they said not to be concerned as long as there is no rattling/ticking when fully warm.

There us an MB service bulletin that recognises this cold start rattle and does indeed suggest changing the cam adjuster but I have read about others having had this done and it still making the noise - and bearing in mind it's a c£2k job per bank (I have been told) one would need to be certain that it is the solution before embarking on that route. Also, supposedly, 2010 on engines had modifications to prevent it, but judging by some of the posts on here it's happening with cars made after that date.

Other suggested reasons have included the oil filter cartridge not being fitted correctly and dirt/debris blocking a valve in the cam adjusters which was removed by a good engine flush - I have no direct evidence to say either works.

It seems a fairly common issue and the fact that it only does it for a split second after start doesn't particularly worry me, but I am curious to know what part normally prevents the oil from draining away from the cams when the engine is switched off and why it only doesn't work occasionally. Is it, for example, electronically controlled and there's an intermittent supply issue or is it just a positioning issue.
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This is my thinking. I'd pretty much 99% say it's a cam adjuster making the noise. My theory is that the cam adjuster position is held under certain engine conditions and temperatures. If the when the engine was warm and the cam adjuster was at full reach in one direction and some of the oil had drained away this would explain the noise. If I drive my car and park it up and leave it over night. When I start in the morning there is no noise at all.
 
Hi Neil,

I have sold my C63 however last year i had these issues last May and spent a lot of time trying to resolve...... Something which unless you are more persistant than i am which i am not sure you are then is a waste of time.

Search my name you will eventually come across some very detailed posts.

MB Tech at Heathrow Mercedes i can give you the name if you PM me and also Eurocharged in Watford.

Believe me you are opening a can of worms and this stuff drove me mad for over a year but it wont damage the engine within the next few years and i have that in writting from Mercedes in Germany,
 
In respect of these various engine noises I had a slight knocking / rattle (1 sec or so) on cold startup which also recently at times came on warm startups. I have now had it at my dealer and they have, after also hearing the noise, noted marks on the camshafts with c4,000 miles on the clock. As fare as I understand this can happen on the M156 independent on mileage so heard of a 200 mileage and 20,000+ mileage cars with this problem.

Only thing I can recommend have it checked and I will let people know where this ends on my side.
 
I have a small rattle on my ML63 on cold start so just got a price on SLS parts from MB parts.
SLS tappets £16.40 each, SLS head bolts £5.20 each and head gaskets £49.70 each £524.8 for the tappet set £104 for the bolt set so why is it so expensive, the parts all seem cheap enough?
 
So on mine they are now changing the cam adjusters so hopefully the issue is resolved.
 
Mine had can adjusters all the followers changed and amg come to look at it

Still exactly the same rattles on initial start for a second only on the right hand bank

Got sick of it being taken apart and my friend who works at the dealer keeps trying them as they come in and says 90% of them do it

So I have stopped worrying about it
Just a bit annoying
 
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