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CL-Class (W215) 2000-2006: CL 500, CL 600

CL 500 Engine Ticking Sound

 
Old 01-24-2019, 10:30 AM
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2001 CL500 (C215)
CL 500 M113 Engine Ticking Sound

Hi everyone
My car has been making a soft ticking sound for a good while now. It's coming from the passenger side of the engine, here's a video where I tried to capture it:
The sound gradually builds as the car gets up to operating temp. - when it's cold, it doesn't appear to make the noise. I have already replaced the hydraulic cam followers on the passenger side, that didn't help. I can also rule out the auxiliary belt system as all the components there are new and I've run the engine with the belt off and it still made the noise.
I suspect that the exhaust manifold on the right side might be going out - these have a double-walled construction and I've read multiple reports on German forums of the innards breaking on the V6 (M112) models especially, which leads to noises described as similar to the one I'm getting. Unfortunately, I have not found a decent quality audio/video recording of a confirmed case so I'm not quite yet willing to drop $500 on a new manifold just on a hunch. I bought a set of used manifolds (described as "perfect" in the ad, of course) and when I got them the passenger side manifold made a distinct rattle when tapped with a finger (the driver side one is perfect, of course... figures!) so I don't wanna install that either.

Is there anything else that could be making such a noise or should I try my luck with another used manifold?

Thanks in advance for your help!

Last edited by butizzle; 01-24-2019 at 01:06 PM.
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Old 02-03-2019, 05:31 AM
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Mercedes
Sounds like s lifter ticking

is your CL blue or silver ? I had one of the very few horizon blue cl and have only seen one other
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Old 02-03-2019, 08:24 AM
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Well, like I said I've already replaced (most of) the lifters on that side, so I really doubt that's what's going on here... I say most of because I'd ordered a full set but they sent me a few wrong ones, so I just focused on the ones to the rear of the engine where the noise appears to be coming from. I've also heard the lifters clacking before after letting the car sit for a month or so, that sounded entirely different - much more metallic and harsh than the soft ticking I'm getting now. I've pretty much convinced myself the problem is likely a cracked/loose exhaust manifold interior - I've ordered two more used passenger side manifolds, hopefully one of them won't have any rattles. Here's the set I already have - the video should make clear why I don't want to install the passenger (right) side manifold:
There's quite a few stories of these manifolds going bad on M112 and M113 engines - the M112 apparently received two updated designs, but the same doesn't appear to be true for the M113.

The color on my car is code 347, "quartz blue" or "chalcedonblau" in German. It's pretty common on these cars around here from what I can tell.

Last edited by butizzle; 02-13-2019 at 03:09 PM.
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Old 02-05-2019, 06:36 PM
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2002 CL500 to CL55 conversion
i would cut your losses on that engine and drop in a used/working 55 AMG engine of the same year. thats what i did when i had a lifter tick on my 500 engine. plug and play... you may be able to get $500 back on that engine on ebay, used 55 engines go for about $2000 last i checked. its not hard to rack up $2000 in parts alone on diagnosing valvetrain sounds...
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Old 02-09-2019, 12:49 AM
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2001 CL500 (C215)
Originally Posted by ctravis595 View Post
i would cut your losses on that engine and drop in a used/working 55 AMG engine of the same year. thats what i did when i had a lifter tick on my 500 engine. plug and play... you may be able to get $500 back on that engine on ebay, used 55 engines go for about $2000 last i checked. its not hard to rack up $2000 in parts alone on diagnosing valvetrain sounds...
Here in Europe, used 55 engines go for closer to $6000... Also, throwing out a well-running engine just to get rid of a minor noise seems like using a sledgehammer to crack a nut.

I'm going to replace the passenger side exhaust manifold with a non-rattling used one tomorrow - we'll see if that fixes my issue.

On another note, the engine has now started to make some lifter noise from the driver's side on cold starts... It goes away after some minutes and some revs, but it's still annoying. Might give it a whole new set of lifters if I find the time, or maybe try out some magic oil additives. But first I want to fix the ticking.
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Old 02-11-2019, 08:27 PM
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looks more like your chains have to be replaced
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Old 02-12-2019, 12:32 AM
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You could probably just leave it alone and drive 50,000 more miles like that
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Old 02-13-2019, 03:05 PM
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Well after replacing the manifold, I can now say with certainty that that was not what was making the noise - the old one was looking perfect and didn't make any noise when tapped.

That places my suspicion back on the valvetrain - I'm still skeptical about this being a lifter because those sound a lot harsher in my experience, but who knows. I was thinking it might be a worn valve guide, which would really suck...

Originally Posted by pmercury
looks more like your chains have to be replaced
I really don't think this is the chain I'm hearing. The noise is coming from one specific cylinder (I'll have to try and find out which one by finding which injector's noise it's synchronous to) and a chain would make more of a constant rattle.
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Old 02-13-2019, 04:21 PM
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Originally Posted by butizzle View Post
Well after replacing the manifold, I can now say with certainty that that was not what was making the noise - the old one was looking perfect and didn't make any noise when tapped.

That places my suspicion back on the valvetrain - I'm still skeptical about this being a lifter because those sound a lot harsher in my experience, but who knows. I was thinking it might be a worn valve guide, which would really suck...


I really don't think this is the chain I'm hearing. The noise is coming from one specific cylinder (I'll have to try and find out which one by finding which injector's noise it's synchronous to) and a chain would make more of a constant rattle.
the chain loose makes the valves loose sync
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Old 02-13-2019, 04:39 PM
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don't just throw money at guessing. This item is worth going to the dealer or a true Benz mechanic for a diagnosis. I got a check engine light for secondary air pump. I put it on and I got the same error message. My off brand Benz mechanic charged me $100 for the diagnosis; it was a vacuum line. So check and fix once. As for replacing the engine, That's just comical.
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