Yamdan

Hej.

Kul jag skickar ett PM så kan vi snacka lite via mail sedan.
Jag är i Helsingborg

MercedesDad

Concur. I see everyone freaking out about this but really, what is the factual percentage of cars actually showing issues thanks to a "less than perfect" design flaw?

If there's indeed such a figure out there, it shouldn't surprise us that it may not be any higher than other porential component issues in Mercedes cars, or any other manufacturers for that matter.

CHEERS FROM FLORIDA!

DuaneC63

The "we've never heard of that" is a common joke played on customers by dealers SAs. If they have to fix your values seals they are going to have to pull the cams and lifters for sure. I know there are methods to replace value seals without removing the heads, but not sure on this motor. Since most likely the top half is going to be apart they should replace the head bolts (they are torque to yield and can only be used once) and new style lifters anyway. Ask to talk to the talk to the tech that will be working on your car to understand the process. See the sticky for the service bulletin on this item.

vancBC

Can anyone check up on my 2009, WDDGF77X79F257679, its got 79k km

Valvestud

All MY 2009 are in the affected group.

Regards,

Joe

patspm66

Hi, quick question for the forum. Owner of an 09 C63 AMG, just over 50K miles. No hint of any engine problems so far. I bought car new in 2009, garage it in winter. Only issues have been occasionally needing to add oil to engine and a headlight failure due to water corrosion. No coolant warning or issues or any other warning signs mentioned in this thread. I have had ECU tuning and bought high performance air filters, but those are only mods.

Questions 1) Am I even eligible for MB extended warranty? I am at like 50300 miles and slightly under 4 years. 2) If MB is no, are there any aftermarket warranties that are legitimate and actually pay out when problems arise? 3) Is there a safe mileage to be in with these reported engine issues?

Point2Point

You just passed 50k miles, so your factory warranty has expired. I believe you can only buy the MB extended warranty while the factory warranty is still in effect.

motoman

I've read and reread the thread(s). No one has explained why headbolts fail to my satisfaction. Before I launch into my take based on "library" research please advise ...

(1) Any instances known of "new" OEM headbolt failure?

(2) Any instances of ARP stud failure?

(3) I can't really tell if all/some only/any of the headbolts is "sunk" in a counter bore. If not all sunk, pattern of broken ones? Important , please.

(4)One picture shows the old headbolt with galvanize coating-true?
The newer bolt looks dark like ?oxide" coat or oil coat?

(5) Merc, more detail on Weistec 500 deg silicone sealer , please.

(6) Any known patterns of owner failures such as (a)short commutes (b)long commutes (c) mixed ? (d) region? yes , but trying to understand.

RossN

Read this, http://www.marcusfitzhugh.com/CLK/63.html

motoman

Ross, thanks for the article. See my new thread. Motoman

motoman

Just combed this thread again...

#24 tri star tech...saw three things significant to me (1) a clear statement of why the later oem bolt may be stronger at the top (2) rust on the shank of the old oem bolt. This is the first time I have seen rust covering anything but the very top of the bolt. Suggesting the coolant past the block threads indeed may be the culprit.(3) "slow coolant leak" suggests I will go ahead with the oil analysis kit i'm holding.

#32 bhamg quoting morgan...the Aussie shop sent out the engine to pressure test by (a) bolting on head with new gasket and OLD HEAD BOLTS, and the coolant came "up thru" the head bolts. Old TTY bolts cannot clamp properly...I wish morgan could tell us exactly where the coolant came out- around the headbolt flanges? Were the headbolts already cracking and tilted? (Please know this is not a criticism of morgan.
His thread has been very good).

found on mrtazzy.com pg id 59...describing the old oem bolts..."the tool interfacing is cut so deep that the head bolt develops fishers (sic) at the base of the bolt weakening it..." So with this we hear that the ?cold heading? operation was defective (as well as the head being too thin)
But fissures sound like cracks, not tooling marks . Just more info...

morganb

Sorry Motoman, I was not there for the test so cannot be 100% certain but I was told the Coolant came up through the head bolts. I assumed it would be through the threads from what was said to me by the SA at the time.

yazid

Just for your information:

I'm waiting on a reply from my MB dealer if they can cover in replacing the head bolts as I've notified them late last week on this issue. Else, gonna have to ask for a quotation from them and gonna compare it to Weistec's items. If it makes sense, I'd might as well get items from Weistec Engineering and get the dealer to do the works for me.

crazeazn

this happened on our CL63 as well. m156 owners under warranty get it done quickly!

bhamg

Glad it worked out for you. Year and mileage at time of failure would be very helpful, thanks.

crazeazn

late 08', 35k miles

bhamg

Right in the sweet spot...thanks crazeazn.

crazeazn

this thread was a godsend, since there is like zero activity on the m156 outside the C63-section

Benz Star

didnt think my first post would be in this thread... I have a deposit on an 09 silver C63 performance package with LSD. Broke a head stud in the test drive.

How reliable is this car after they warranty the head studs? Has anyone had repeat problems?

Funny thing was I read this post before I went to the dealer and immediately knew what happened when the coolant light came on and it went in to limp mode.

CoolBDPhenom03

Lucky you! It won't be a repeat problem. They use different parts now.

bhamg

Benz Star - Once repaired the motor should be set for the long haul. While it's too early to tell for sure, the factory knows much more than we do about the cause of this problem so I expect the fix to do the job.

Please post the mileage when you get a chance...thanks and good luck with this car. Getting it fixed like this before you take delivery could be a very good thing.

Yamdan

Well this really starts to take some joy from owning my car :-(.

Have had my 2009 for a few months and the more I read about this the more Im concerned if I did the correct choise to sell my M3 and get the C63.
Love the C63 but since we dont have any extended warranty in Sweden I have to trust my insurance to cover this issue if it happens.
And they can be a pain to deal with. :-(.

Its a bit weird that pretty no one of the MB dealers here In Sweden seems to know about this head bolt issue?!?

morganb

Great timing! Well Done. I have about 20K KM on mine after replacement and no hint of a problem.

DuaneC63

Actually you're lucky to break it on the test drive. There is an entire refit package that is used to remedy the problem. The biggest items are newly designed head bolts and new design lifters out of the SLS63. The parts list is over a page long and a lot of labor hours. Once this is all done, you shouldn't have to worry about it again. Best of luck.

Benz Star

The car has 49K miles on it and will have CPO for another year over that.

Yamdan I drove a 2011 M3 6MT back to back with an 09 AMG without Performance package or LSD and they arent even in the same ballpark. Was so disappointed coming from the car I am trading in (a COBB Stage 2+ Tuned 2008 BMW 135i FBO car with a killer suspension setup).

Thanks everyone for the quick replies, talked to the dealership last night and the parts come in Monday or Tuesday and should be able to pick up the car a week from today!