Loud noise at startup
Junior Member
Joined: Aug 2012
Posts: 26
Likes: 0
From: Fort Worth
2010 C300 Sport
Here it goes..W/8429 TOLERANCE INADEQUATE PERFORMED NOISE LOCATION TEST IN ORDER TO DETERMINE LOCATION,FOUND COMING FROM LOWER END
FOUND NEEDING CRANK BEARING REPLACEMENT,DISCONNECTED GROUND LINE
DRAINED ALL FLUIDS, R AND R ENGINE,R AND R TRANSMISSION, PLACED ENGINE ON ENGINE STAND AND R AND R UPPER AND LOWER OIL PAN R AND R ALTERNATOR, R AND R STARTER R AND R REPLACED ENGINE CRANK BEARINGS AND INCREASED SIZE AS PER SHEET,CORRECTED FLUID LEVEL, ERASED FAULT CODES, TEST / DRIVE PERFORMED. CAUSE:941013 LOCATE W-8429
PARTS:
1. 272-033-39-02-56 MAIN ENGINE BEARING
2. '' '' '' '' '' '' ''
3. '' '' '' '' '' '' ''
1. '' '' '' '' '' '' ''
8. 000000-001811 screw
8. 000000-001810 screw
6. 910143-008018-64 screw
2. 910105-008037 screw
1. 272-033-42-02-56 main bearing
1. 010-989-90-71 cleaning age
1. 001-986-71-71-00 cleaning com
1. 003-989-98-20-10 sealant MB
1. q-1-03-0004 anti corrosion
1. q-1-32-0001 hydraulic oil
1. 000-180-26-09 TS filter in
1. 007603-014106 seal ring, VL
9. q-1-09-0144 MOBIL 1 form
012800 engine with AUTOM. trams r and r 8429 W
272110 AUTOM transmission r and r (engine w transmission removed)
014270 engine in assembly stand tighten (engine removed.output side exposed for access) 8429 W
034291 crankshaft (engine removed, output exposed and replace)
**plus loaner for 9 days and courtesy wash on clients vehicle.
Hope info help's (3-5 sec cold crank start) NORMAL ?? Raspu
FOUND NEEDING CRANK BEARING REPLACEMENT,DISCONNECTED GROUND LINE
DRAINED ALL FLUIDS, R AND R ENGINE,R AND R TRANSMISSION, PLACED ENGINE ON ENGINE STAND AND R AND R UPPER AND LOWER OIL PAN R AND R ALTERNATOR, R AND R STARTER R AND R REPLACED ENGINE CRANK BEARINGS AND INCREASED SIZE AS PER SHEET,CORRECTED FLUID LEVEL, ERASED FAULT CODES, TEST / DRIVE PERFORMED. CAUSE:941013 LOCATE W-8429
PARTS:
1. 272-033-39-02-56 MAIN ENGINE BEARING
2. '' '' '' '' '' '' ''
3. '' '' '' '' '' '' ''
1. '' '' '' '' '' '' ''
8. 000000-001811 screw
8. 000000-001810 screw
6. 910143-008018-64 screw
2. 910105-008037 screw
1. 272-033-42-02-56 main bearing
1. 010-989-90-71 cleaning age
1. 001-986-71-71-00 cleaning com
1. 003-989-98-20-10 sealant MB
1. q-1-03-0004 anti corrosion
1. q-1-32-0001 hydraulic oil
1. 000-180-26-09 TS filter in
1. 007603-014106 seal ring, VL
9. q-1-09-0144 MOBIL 1 form
012800 engine with AUTOM. trams r and r 8429 W
272110 AUTOM transmission r and r (engine w transmission removed)
014270 engine in assembly stand tighten (engine removed.output side exposed for access) 8429 W
034291 crankshaft (engine removed, output exposed and replace)
**plus loaner for 9 days and courtesy wash on clients vehicle.
Hope info help's (3-5 sec cold crank start) NORMAL ?? Raspu
Newbie
Joined: Feb 2013
Posts: 2
Likes: 0
'13 SL 550
My wife's 2013 SL 550 has been at the shop twice in the past week for this symptom. The first time they said they heard the noise and diagnosed it as a faulty cam chain tensioner (evidently the tension part uses oil pressure and this one was slow to tension the chain on cold start up). Got it back, and the next cold start it still had a pretty odd resonance (a roar of sorts) that went away after about 20 seconds.
For an old school racer, it sounded like a dry bearing and I hated to have a brand new car failing on me, so we took it back to be looked at. This morning they called and said it was a normal part of the twin turbo's cold start sequence and was part of an emissions cycle.
They went on to say that owners of prior 550's (including us, obviously) were likely to complain because the old engine was so much quieter.
Well, I'm glad it is not broken, but man it sounds like crap for the first 20 seconds or so on a cold start up.
For an old school racer, it sounded like a dry bearing and I hated to have a brand new car failing on me, so we took it back to be looked at. This morning they called and said it was a normal part of the twin turbo's cold start sequence and was part of an emissions cycle.
They went on to say that owners of prior 550's (including us, obviously) were likely to complain because the old engine was so much quieter.
Well, I'm glad it is not broken, but man it sounds like crap for the first 20 seconds or so on a cold start up.
Member
Joined: Feb 2006
Posts: 137
Likes: 2
Various
My wife's 2013 SL 550 has been at the shop twice in the past week for this symptom. The first time they said they heard the noise and diagnosed it as a faulty cam chain tensioner (evidently the tension part uses oil pressure and this one was slow to tension the chain on cold start up). Got it back, and the next cold start it still had a pretty odd resonance (a roar of sorts) that went away after about 20 seconds.
For an old school racer, it sounded like a dry bearing and I hated to have a brand new car failing on me, so we took it back to be looked at. This morning they called and said it was a normal part of the twin turbo's cold start sequence and was part of an emissions cycle.
They went on to say that owners of prior 550's (including us, obviously) were likely to complain because the old engine was so much quieter.
Well, I'm glad it is not broken, but man it sounds like crap for the first 20 seconds or so on a cold start up.
For an old school racer, it sounded like a dry bearing and I hated to have a brand new car failing on me, so we took it back to be looked at. This morning they called and said it was a normal part of the twin turbo's cold start sequence and was part of an emissions cycle.
They went on to say that owners of prior 550's (including us, obviously) were likely to complain because the old engine was so much quieter.
Well, I'm glad it is not broken, but man it sounds like crap for the first 20 seconds or so on a cold start up.
Newbie
Joined: Feb 2013
Posts: 2
Likes: 0
'13 SL 550
It should not rattle, that is slack in the timing chain allowing it to hit on the cover. When the oil pressure comes up and the pressure driven chain tensioner starts to work, then the slack is taken away and the noise disappears.
I think they will find that and fix it for you. I would guess that it only happens on cold start up and the longer it has sat, the worse the issue.
I think they will find that and fix it for you. I would guess that it only happens on cold start up and the longer it has sat, the worse the issue.
Newbie
Joined: Jun 2013
Posts: 2
Likes: 0
C63 AMG
Thank you for the post as I have the same problem occurring with my C63. It seems to happen to me when the engine cools to between 50-60 degrees which is usually an hour or two depending on the temp outside. Was this repair covered under warranty? I am now into my extended warranty so probably out of luck.
Newbie
Joined: Jun 2013
Posts: 2
Likes: 0
C63 AMG
I just found my extended warranty document from MB Canada and covered items listed under Engine includes, among other components, "all internally lubricated parts" and "seals and gaskets". The warranty is only applicable in Canada so maybe components differ in US.
I will post back to the forum after I visit my dealer. I noticed a couple of pricy defective items I paid for just before Christmas which are on the "covered" list so it should be a great conversation.
I will post back to the forum after I visit my dealer. I noticed a couple of pricy defective items I paid for just before Christmas which are on the "covered" list so it should be a great conversation.
Member
Joined: Jan 2013
Posts: 190
Likes: 76
2013 ML550 US spec. Air+Offroad pkg
W166 clicking on startup
My 2013 ML550 (W166) was doing this too. There is a Service Bulletin out there for this. It is the timing chain tensioners. There are 2, one for each bank of cylinders. They are oil pressure activated, so when the pressure gets low on shutdown, takes a few seconds to build up pressure for them to work again. The sound you hear is the chain slapping until the pressure is up. The fix is a check valve installed behind each tensioner to keep the pressure up in the tensioners when not running...warranty fix, problem solved (for me).
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Out Of Control!!
Joined: Jul 2003
Posts: 15,901
Likes: 4,630
From: North Scottsdale, AZ
'71 Pinto
LI05.10-P-056435
https://mbworld.org/forums/5738609-post153.html
https://mbworld.org/forums/5738609-post153.html
Newbie
Joined: Mar 2014
Posts: 1
Likes: 0
e350
I bought a new MB 2012 e350 Blue efficiency 4matic for my wife. Cold start with knocking noise at the beginning but not so loud. A year later the knocking noise get louder and louder.
I took it in the shop for twice. 1st time they replaced:
1. cover on right front cylinder head
2. cover on left front cylinder head
3. left secondary drive chain tensioner
4. right secondary drive chain tensioner
5. flance gastket
6. hexalobular bolt
7. oil pressure check valves
got the car back. But the problem still there. Took it back for second time they quoted in the paper work "no abnormal noises heard"
The knocking noise is still there and it just does not seem right for the engine.
What should I do know? or any suggestions?
I took it in the shop for twice. 1st time they replaced:
1. cover on right front cylinder head
2. cover on left front cylinder head
3. left secondary drive chain tensioner
4. right secondary drive chain tensioner
5. flance gastket
6. hexalobular bolt
7. oil pressure check valves
got the car back. But the problem still there. Took it back for second time they quoted in the paper work "no abnormal noises heard"
The knocking noise is still there and it just does not seem right for the engine.
What should I do know? or any suggestions?
Junior Member
Joined: Mar 2019
Posts: 66
Likes: 10
Mercedes Benz CLS 55 AMG
I know this is an old thread but I have a 2014 CLS 550 that I just bought. 25k original miles. At start up after been driving it for a while (parked for 30-1 hour ) when I restart it has the clunk chatter 2-3 second metallic (lifter, valve or Crank bearing) type noise. It worries me as I bought this car hoping for it to be my long term daily driver. What is the 8429 you guys speak of? Was their a recall?
Senior Member
Joined: Sep 2002
Posts: 352
Likes: 12
From: Worcester, MA
15' CLS400
Same issue with a 2015 CLS400 with 276 engine. 120k miles on it. Developed a knocking sound only on warm restarts.
Dealer reported it needed a new camshaft adjuster and chain tensioner. Quote was $5500. -- Sorry to say I said no, went to sales and bought an Audi
Dealer reported it needed a new camshaft adjuster and chain tensioner. Quote was $5500. -- Sorry to say I said no, went to sales and bought an Audi
Junior Member
Joined: Mar 2019
Posts: 66
Likes: 10
Mercedes Benz CLS 55 AMG
Yeah. I hear you. Its the tensioners and it isnt that much at independent shop. But i hear you. Sometimes thicker viscosity oil fixes it. I did add oil additive from Lubeguard and 5w50 or 15w50 and mine doesnt make noise anymore. But prob is a bandaid. Will see
Junior Member
Joined: Mar 2019
Posts: 66
Likes: 10
Mercedes Benz CLS 55 AMG
which audi did you go with? I still have the sound king of. Its winter now so not as pronounced. I kind of quit listening for the noise. Running 15w50 SVL ester based Triax oil which is the absolute best oil ever. But after doing tons more research I would have to replace check valves and tensioners and new chain if its loose. Idk about these engines. I know some guys run diesel oils and claim it gets rid of it. I may try diesel oil again. I did run it prior but never paid attention to the noise at first.
Senior Member
Joined: Sep 2002
Posts: 352
Likes: 12
From: Worcester, MA
15' CLS400
which audi did you go with? I still have the sound king of. Its winter now so not as pronounced. I kind of quit listening for the noise. Running 15w50 SVL ester based Triax oil which is the absolute best oil ever. But after doing tons more research I would have to replace check valves and tensioners and new chain if its loose. Idk about these engines. I know some guys run diesel oils and claim it gets rid of it. I may try diesel oil again. I did run it prior but never paid attention to the noise at first.
For anyone thinking of actually getting the engine fixed.. the worst part is not knowing if the opposite side will have an issue right after fixing the current issue.
One other note: We MB diy'rs are spoiled by having bootleg WIS copies on eBay. It's a lot harder to do things on other cars without YouTube.
