Knocking sound on startup. Bring it up to dealer or leave it alone?
Thread Starter
Newbie
Joined: Oct 2012
Posts: 6
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From: Temecula, CA
2009 C300
Knocking sound on startup. Bring it up to dealer or leave it alone?
Hi all,
I know this has been an ongoing topic the past few years. My 2009 C300 makes the knocking sound after it's been sitting for a while. Should I make a trip to the dealer or just leave it alone? What is the experience others have had with just leaving it alone?
I know this has been an ongoing topic the past few years. My 2009 C300 makes the knocking sound after it's been sitting for a while. Should I make a trip to the dealer or just leave it alone? What is the experience others have had with just leaving it alone?
Member
Joined: Oct 2012
Posts: 114
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From: Danbury,CT/Brooklyn,NY
2009 W204 Sport 4M
Personally i have read up alot on it and even though my car I just acquired doesnt seem to have this I would say leave it alone lots of threads I read had guys with 75k+ miles no issues its only first few seconds when u start up my dads both subaru did this inlcuding his new one and all were fine without hiccups. you dont want the dealer ripping your motor apart they dont have same expiernce factory does.
Junior Member
Joined: Aug 2012
Posts: 26
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From: Fort Worth
2010 C300 Sport
I know this has been discussed ad nauseum, but I have the same question. Here's what I don't understand: earlier models, such as my father-in-law's 1984 MB 380 SL, make the same noise. If this were an ongoing issue, wouldn't MB have addressed this in later models? My father-in-law hasn't had any issues and he's well over 100k miles.
I have no desire, as RuskiBenz said, to have the dealer remove the engine for this. And not that I necessarily believe everything my service adviser tells me, he did say that this noise is "normal." Whether it's normal has obviously been a subject of debate on here.
I have no desire, as RuskiBenz said, to have the dealer remove the engine for this. And not that I necessarily believe everything my service adviser tells me, he did say that this noise is "normal." Whether it's normal has obviously been a subject of debate on here.
Super Member
Joined: Mar 2012
Posts: 591
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From: San Francisco
'08 Mercedes C300
I think someone mentioned that it was the oil system pressurizing on start up that causes the knocking/some minor shaking. I have this on my vehicle as well for a few seconds on start up. After that, the car runs smooth.
MBWorld Fanatic!
Joined: Feb 2004
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From: SEATTLE WASHINGTON USA
'08 C300 Lux Barolo Red Beige Leather P2 MM 18" wheels '84 944
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MBWorld Fanatic!
Joined: Feb 2004
Posts: 3,986
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From: SEATTLE WASHINGTON USA
'08 C300 Lux Barolo Red Beige Leather P2 MM 18" wheels '84 944
And which bearings were replaced? Rods? Mains? Upper and lower mains or just lowers since replacing the uppers means pulling the crankshaft.
There have been a few (very few) reports of bearing replacements here but when I ask for specifics (what did the R.O. say specifically?) the OP disappears into the woodwork and never answers.
I can't go to my dealer service manager and say "I read on the Internet that somebody's car someplace had a bearing change which cured the problem" without proof they can research is useless information.
BTW, my C300's engine knocks like hell on 90% of starts, hot or cold. It's done this for five years and 36K miles and I'm sick of it.
Last edited by RLE; Oct 4, 2012 at 03:58 PM.
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Junior Member
Joined: Aug 2007
Posts: 70
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From: Columbus, OH
G63
didnt intend for you to go on the defensive? was just stating a fact. my techs would jump all over the car if on start up it had a knock. this repair cannot be an "add on" line and must be brought back in and wrote up as an original complaint. unless the tech is good and has experience its not THAT lucrative. BUT 75% of my techs could do complete main bearing replacement and have car running by the end of the day. Different dealers do different repairs. My original RO line would read nothing more than client states there is a knocking on start-up.
MBWorld Fanatic!
Joined: Feb 2004
Posts: 3,986
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From: SEATTLE WASHINGTON USA
'08 C300 Lux Barolo Red Beige Leather P2 MM 18" wheels '84 944
MBWorld Fanatic!
Joined: Feb 2004
Posts: 3,986
Likes: 6
From: SEATTLE WASHINGTON USA
'08 C300 Lux Barolo Red Beige Leather P2 MM 18" wheels '84 944
didnt intend for you to go on the defensive? was just stating a fact. my techs would jump all over the car if on start up it had a knock. this repair cannot be an "add on" line and must be brought back in and wrote up as an original complaint. unless the tech is good and has experience its not THAT lucrative. BUT 75% of my techs could do complete main bearing replacement and have car running by the end of the day. Different dealers do different repairs. My original RO line would read nothing more than client states there is a knocking on start-up.
Junior Member
Joined: Aug 2012
Posts: 26
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From: Fort Worth
2010 C300 Sport
Here it is, though I'm just now realizing this was posted in the C218 forum (will try to confirm if this was done under warranty):
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.
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.
Last edited by frogs9497; Oct 4, 2012 at 09:49 PM.
MBWorld Fanatic!
Joined: Feb 2004
Posts: 3,986
Likes: 6
From: SEATTLE WASHINGTON USA
'08 C300 Lux Barolo Red Beige Leather P2 MM 18" wheels '84 944
didnt intend for you to go on the defensive? was just stating a fact. my techs would jump all over the car if on start up it had a knock. this repair cannot be an "add on" line and must be brought back in and wrote up as an original complaint. unless the tech is good and has experience its not THAT lucrative. BUT 75% of my techs could do complete main bearing replacement and have car running by the end of the day. Different dealers do different repairs. My original RO line would read nothing more than client states there is a knocking on start-up.
And since a W218 is a CLS, was this an M272 or not?
Junior Member
Joined: Aug 2007
Posts: 70
Likes: 2
From: Columbus, OH
G63
OKAY. the engine comes out of the top. no need to pull the trans out. repairs do not need to be pre authorized by mbusa. warranty parts are just held in case they want them back. mount the engine on the stand. split it apart. pull the crank replace the bearings and back together. ive watched it happen. in one day. go to a better shop. total time before car is back would be about 3 days. day one comes in, two repairs done, 3 test drove and back to you
