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-   -   Chalk up another broken Headbolt count! (https://mbworld.org/forums/c63-amg-w204/645752-chalk-up-another-broken-headbolt-count.html)

x14828 12-02-2016 12:51 PM

Chalk up another broken Headbolt count!
 
Didn't realise my first post would be about a broken headbolt, but thanks to this board and the wealth of knowledge before buying my car, I couldn't have been more calm and educated about this issue. My mechanic said he has never seen anyone more relaxed about a $3500 repair bill. He said most people show up with sharp metal objects when he explains how a $12 bolt can cause such catasrophic damage to their bank account.

Mine is an '09 C63 with about 80k(that's in KM, about 50k in miles). Previous owner was a friend of mine from new and my knowledge of the car history was probably the only reason why I took a leap on a used high milage, high performance German car without a warranty. We agreed that the headbolts would eventually become an issue and gave me an appropriate deal on the car.

The cost to do a headbolt job with new gaskets and cleaning was about $2.5K(in USD), my lifters were on its way as well so that added another $1K.

What was interesting was that the shop used to be a independent Merc shop but because so many cars came in for headbolts that they are now a shop that simply specializes on M156 headbolts. The number of headbolt repairs they do on a weekly basis is quite scary. He said in every engine he opened with the effected headbolts were either broken or on its way to being broken. He has seen cars go well past 100k before being broken and some that wouldn't last 20k... but he is quite adamant that it's not an issue of if, but when.

The good thing is that they have this repair perfected so the cost has come down significantly compared to the past when he charged well over $4K during the first batch of effected cars.

I bought my C63 because I knew this would be the last of its kind. It would be something I will tell my children how the world was once a great place where shoehorning a naturally aspirated 6200cc V8 into a compact family sedan with no regards to self-restraint was a good idea.

I really owe this board a load of thanks, especially to the early 'pioneers' who must've gone through hell trying to resolve this issue. :bow:

SuperFastYo 12-02-2016 01:06 PM


Originally Posted by x14828 (Post 6984659)
The number of headbolt repairs they do on a weekly basis is quite scary. He said in every engine he opened with the effected headbolts were either broken or on its way to being broken. He has seen cars go well past 100k before being broken and some that wouldn't last 20k... but he is quite adamant that it's not an issue of if, but when.

Oh great, you just reassured my deepest darkest fears. Thanks!

vtune 12-02-2016 01:15 PM

whats the name of this shop?

JPetros2008 12-02-2016 01:18 PM

and where is it located?

chrisridebike8 12-02-2016 01:42 PM

Now I wish I had done headbolts earlier.

s.e.a.n. 12-02-2016 01:56 PM

Same thing happen with my 09 shortly after the purchase, had to change the head bolts, lifters along with the cam adjusters.

Dogtag114 12-02-2016 08:43 PM

Is there an easy way to see if a previous owner already repaired?

Jasonoff 12-02-2016 08:52 PM

Only way is to yank the valve cover and visually inspect.

Mag1c Carp3t 12-02-2016 08:56 PM


Originally Posted by Dogtag114 (Post 6985067)
Is there an easy way to see if a previous owner already repaired?

It would be in the car fax Maintanance history. If the owner did do it, it would definitely be noted and bragged about as it can help sell the car.

Mag1c Carp3t 12-02-2016 09:03 PM

I would take advantage of this situation and have the heads sent off to a machine shop for a pnp. This is the one thing that makes me believe it's ok if it happens. I got a quote for $1500 for the pair of heads. Shop said a claimed 20hp increase. I was also quoted $2500 for my head bolts.

aussie e55 12-02-2016 09:23 PM

hi X14828
where in the would are you thanks

Celicasaur 12-02-2016 10:32 PM


Originally Posted by Mag1c Carp3t (Post 6985080)
I would take advantage of this situation and have the heads sent off to a machine shop for a pnp. This is the one thing that makes me believe it's ok if it happens. I got a quote for $1500 for the pair of heads. Shop said a claimed 20hp increase. I was also quoted $2500 for my head bolts.

lol that's exactly what I would do too! it would add a silver lining to an otherwise dark time.

m a x i m u s 12-03-2016 12:14 AM


Originally Posted by Celicasaur
lol that's exactly what I would do too! it would add a silver lining to an otherwise dark time.

I agree. You already have the thing taken apart anyway.

604 C63 12-03-2016 12:53 AM

well, thats a helluva first post. Lets hope we get a second, with a name/location of that shop.

And I love this.....


Originally Posted by x14828 (Post 6984659)
It would be something I will tell my children how the world was once a great place where shoehorning a naturally aspirated 6200cc V8 into a compact family sedan with no regards to self-restraint was a good idea.

Yeah, thats the sweet sweet candy that got us all hooked lol.

Mag1c Carp3t 12-05-2016 01:49 PM

Figured I'd post up my quote for the preventative repair.

https://cimg6.ibsrv.net/gimg/www.mbw...f52a44f3bd.png

SuperFastYo 12-05-2016 01:52 PM

3k is not bad at all :y

I just don't understand why this wasn't a recall...

chrisridebike8 12-05-2016 02:01 PM

With the heads off, is it a good idea to do the timing chain guides as well? And if you add on cam adjusters, how much does that add? Thanks!

Jasonoff 12-05-2016 02:04 PM


Originally Posted by Mag1c Carp3t (Post 6986969)
Figured I'd post up my quote for the preventative repair.

Cam follower, FFS, another name to call them :rolf:

SuperFastYo 12-05-2016 02:05 PM

Get it pnp while your at it too!

s.e.a.n. 12-05-2016 03:30 PM


Originally Posted by chrisridebike8 (Post 6986993)
With the heads off, is it a good idea to do the timing chain guides as well? And if you add on cam adjusters, how much does that add? Thanks!

Cam adjusters are $650 each. The M156 uses 4 so that $2,600 just in parts not exactly cheap, neither is PnP since everyone is throwing that around.

Vladds 12-05-2016 04:17 PM

Why no exhaust manifold gaskets?
I don't think they pull the heads with the manifolds attached and separate by the front converters, hm.
Why no TTY aluminum bolts for the intake manifold?

Mag1c Carp3t 12-05-2016 04:26 PM


Originally Posted by s.e.a.n. (Post 6987087)
Cam adjusters are $650 each. The M156 uses 4 so that $2,600 just in parts not exactly cheap, neither is PnP since everyone is throwing that around.

I was quoted $1500 for my pnp job with gains of 20hp. I don't find this expensive.

SuperFastYo 12-05-2016 04:27 PM


Originally Posted by Mag1c Carp3t (Post 6987147)
I was quoted $1500 for my pnp job with gains of 20hp. I don't find this expensive.

well good sir, we are in two entirely different tax brackets.

Celicasaur 12-05-2016 05:10 PM


Originally Posted by Mag1c Carp3t (Post 6987147)
I was quoted $1500 for my pnp job with gains of 20hp. I don't find this expensive.

That is actually quite a damn good price - especially as it includes AMG tax.

Mag1c Carp3t 12-05-2016 05:42 PM


Originally Posted by SuperFastYo (Post 6987149)
well good sir, we are in two entirely different tax brackets.

Wasn't speaking financially. I guess the proper way about this was asking how you believe this to be expensive.


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