What would happen if a 6.3L crank bolt went into a 55k???
Thread Starter
MBWorld Fanatic!
Joined: Jan 2009
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From: Tempe, Az
CLS55 AMG 030
Okay, let me make sure I've got this straight -
1. The bolt was NOT replaced as specified by MB workshop procedures;
2. Somehow you later end up with the wrong part (bolt) installed in your car;
3. Whatever bolt was installed wasn't torqued down correctly in two steps; and
3. Now you're wondering why the crank bolt backed out and probably ruined your crankshaft.
We all feel your pain, but back when you first posted about your Ferrari mechanic not being able to find the tensioner release for the accessory drive belt, many on this Board advised you to take your car to a mechanic that was competent and familiar with MBs. That didn't happen and it's only gotten worse from there. I hope whoever messed up your latest install accepts their responsibility and pays for the damage they've caused. GL getting it repaired and back on the road.
1. The bolt was NOT replaced as specified by MB workshop procedures;
2. Somehow you later end up with the wrong part (bolt) installed in your car;
3. Whatever bolt was installed wasn't torqued down correctly in two steps; and
3. Now you're wondering why the crank bolt backed out and probably ruined your crankshaft.
We all feel your pain, but back when you first posted about your Ferrari mechanic not being able to find the tensioner release for the accessory drive belt, many on this Board advised you to take your car to a mechanic that was competent and familiar with MBs. That didn't happen and it's only gotten worse from there. I hope whoever messed up your latest install accepts their responsibility and pays for the damage they've caused. GL getting it repaired and back on the road.
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From: In a box
W211 E55
This is incorrect info - LET has never reused a crank bolt and never will.
Thread Starter
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From: Tempe, Az
CLS55 AMG 030
[QUOTE=ChicagoX;3668141]The second step in torquing the bolt is 90-degrees of rotation AFTER initial torque spec. This stretches the bolt enough to hold the pulley on without any need for loc-tite or similar. I wish you a rapid and inexpensive resolution to your issue.
Thanks, Ya the first time I thought that I did 90-degrees but i guess not I'am hearing that it take 4ft long breaker bars and tons of torque
Thanks, Ya the first time I thought that I did 90-degrees but i guess not I'am hearing that it take 4ft long breaker bars and tons of torque
Last edited by RenntechE55; Aug 13, 2009 at 06:00 PM.
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02 C32 AMG
Thread Starter
MBWorld Fanatic!
Joined: Jan 2009
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From: Tempe, Az
CLS55 AMG 030
Well everyone can sleep better tonight lol, my car is out of my hands and with Chris at Floored Fab. So I'm sure he can fix my car and while he's at it he's throwing my LT's on
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From: Philadelphia, PA
2008 A8L, 2002 996TT X50, 2009 X5
While you may not "have to" replace it, I will say that not replacing the crank bolt with a new OEM one is, at the very least, poor judgement. It's a $10 part, allegedly is supposed to be a one-time-use stretch bolt, and ultimately is critical to the health of the engine. Why any reputable MB tuning organization would skip this cheap insurance for their clients is beyond me...
Out Of Control!!
Joined: Sep 2004
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From: San Diego
2015 S212
As the facts come out now, this just goes from bad to worse. You CANNOT reuse the crank bolt because it's a stretch to torque bolt. The MB WIS is very clear on this. Did no one learn anything went Jangy went through this with James a while back?
If the crank bolt is reused, it's simply a BAD INSTALL.
If the crank bolt is reused, it's simply a BAD INSTALL.
Out Of Control!!
Joined: Sep 2004
Posts: 13,394
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From: San Diego
2015 S212
Renntech reuses the stock bolt, AMS reuses the stock bolt, Mercedes reuses the stock bolt, and I'm sure other tuners reuse the stock bolt.
I don't think MB uses it, but either way...best not to argue. Simply put, IF MB really didn't use it on yours when the procedure says to, then you should speak with my brother the lawyer who happens to be working on numerous Chrysler fraud claims.
why didn't the reused bolt fail during the 3+ years of service with the renntech pulley? Why havent a number of members cars have bolt failures after reusing the stock bolt?
I would like to think that the numerous client cars are running fine because they were modded properly (however you want to define it). Why OP's car ran fine could be that the 63 bolt was rammed in and held. That doesn't mean he can re-ram, nor does it mean Dyno Comp is at fault.
EDIT: there is debate on the reuse of the stock bolt. Im not a mechanic and dont do install work. I just race and come up with crazy ideas. From what my eyes have seen and what the dealer has done to my car. I've never personally seen the bolt fail on the number of pulley i've seen installed. strangely enough I've seen some pulleys come in to the shop that have failed, None on a MBZ though. Well except for a CLK430 that had the rubber damper missing from the stock pulley.
I don't think MB uses it, but either way...best not to argue. Simply put, IF MB really didn't use it on yours when the procedure says to, then you should speak with my brother the lawyer who happens to be working on numerous Chrysler fraud claims.
why didn't the reused bolt fail during the 3+ years of service with the renntech pulley? Why havent a number of members cars have bolt failures after reusing the stock bolt?
I would like to think that the numerous client cars are running fine because they were modded properly (however you want to define it). Why OP's car ran fine could be that the 63 bolt was rammed in and held. That doesn't mean he can re-ram, nor does it mean Dyno Comp is at fault.
EDIT: there is debate on the reuse of the stock bolt. Im not a mechanic and dont do install work. I just race and come up with crazy ideas. From what my eyes have seen and what the dealer has done to my car. I've never personally seen the bolt fail on the number of pulley i've seen installed. strangely enough I've seen some pulleys come in to the shop that have failed, None on a MBZ though. Well except for a CLK430 that had the rubber damper missing from the stock pulley.
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Out Of Control!!
Joined: Sep 2004
Posts: 13,394
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From: San Diego
2015 S212
Are you serious? Where is the 55k still being made and used? The 63 motor is being built in MB, the first in history.
Out Of Control!!
Joined: Sep 2004
Posts: 13,394
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From: San Diego
2015 S212
+1
While you may not "have to" replace it, I will say that not replacing the crank bolt with a new OEM one is, at the very least, poor judgement. It's a $10 part, allegedly is supposed to be a one-time-use stretch bolt, and ultimately is critical to the health of the engine. Why any reputable MB tuning organization would skip this cheap insurance for their clients is beyond me...
While you may not "have to" replace it, I will say that not replacing the crank bolt with a new OEM one is, at the very least, poor judgement. It's a $10 part, allegedly is supposed to be a one-time-use stretch bolt, and ultimately is critical to the health of the engine. Why any reputable MB tuning organization would skip this cheap insurance for their clients is beyond me...
