M156 head bolt problems




That's why I have the extended warranty for 7yr/135K and I'll trade in before it expires.
Engine no.: 156980 60 044563
Am I affected by head bolt if so what are the warning signs?
The Best of Mercedes & AMG
I did see a check engine oil light but when u checked a few hours later, I see oil is between min and max more like towards 3/4. Manual says that ok
Should I check coolant level daily or weekly?
Thank ya


I did see a check engine oil light but when u checked a few hours later, I see oil is between min and max more like towards 3/4. Manual says that ok
Should I check coolant level daily or weekly?
Thank ya
I have had my car for 3 years, engine number 156980 60 003674, yeah a real early one! Have had low coolant message come up once so I topped it off.
This was 2 years ago.
Theres no need to panic - just be aware.
if you top it off and it comes back, don't drive it.
Last edited by schmick325; May 10, 2013 at 08:31 AM.
I have had my car for 3 years, engine number 156980 60 003674, yeah a real early one! Have had low coolant message come up once so I topped it off.
This was 2 years ago.
Theres no need to panic - just be aware.
if you top it off and it comes back, don't drive it.
Thank you for advice


my car has 70k miles on it, i have extended warranty until 110k miles but through a 3rd party (fidelity). Anyone hear of 3rd party warranties footing the bill for this? Been skipping through and so far I've only seen MB warranty.


Not to tread on anybodies parade but is there someone out there that could explain why there seems to be a lot of failures of the head bolts in the C63 platform but few on the E63 Platform. I have read that the possible diff is the fact that owners of the E usually or a higher percentage take their cars to the dealer?
What I would really like to know is that when the original head bolts were designed and resourced are there actual batch numbers for the bolts and were they supplied from the same supplier, were there different suppliers? I find it hard to believe that Merc purchased a whole train car full of bolts to be used in all future engines but you never know. Thanks in advance for any info dealing with my queries.


Not to tread on anybodies parade but is there someone out there that could explain why there seems to be a lot of failures of the head bolts in the C63 platform but few on the E63 Platform. I have read that the possible diff is the fact that owners of the E usually or a higher percentage take their cars to the dealer?
What I would really like to know is that when the original head bolts were designed and resourced are there actual batch numbers for the bolts and were they supplied from the same supplier, were there different suppliers? I find it hard to believe that Merc purchased a whole train car full of bolts to be used in all future engines but you never know. Thanks in advance for any info dealing with my queries.
If there are more failures in the C, it's more likely due to numbers sold versus other models.
Regards,
Joe
Thanks for the quick reply
Having worked in the steel industry for 3 decades plus, I do understand your statement of it being a design issue, but the metalurgical components, the so called cake mix aspect of the first bolt out of the die in 05 or 06 could not and would not be the same as the bolts coming out of the die two years later. When I see bolts that have a washer area that is not properly centered this is not design but poor quality control.
Thank You again for your input Joe
Are there stats showing failure rates according to year of manufactor? 07- 10
Has anyone found out if the bolts were in fact supplied from one supplier? This I realize would probably be answered from internal knowledge of AMG sourcing.
Anyone out there?







