Serpentine Belt + Overheat

shamun160 · 08-16-2016, 02:07 PM

At the track a few weekends ago I got:
"Charging System Malfunction"
followed by idrive indicating Overheating and the car going into lymp mode.

In the pits it was clear the serpentine belt had shredded.

After having it trailered to my dealer they tracked down the root cause as a seized idler pulley. Since then they have been chasing check engine codes for the overheat and then a vacuum leak.

It appears the vacuum leak was being caused by a bad crank seal which has been replaced.

Today they dropped the oil pan and found parts of the belt in the oil pan, "but it did not make its way anywhere else in the engine".

Any theories and what happened here? I am not sure I am comfortable with we changed your oil and filter now you are good to go.

Car is stock with 15K miles on it. September 2014 build.

Thanks for your input/advice.

kitesurfer · 08-18-2016, 09:31 AM

How does belt make its way into the oil pan

Wonderful how the service dept. states it did not make it to other areas in the engine.... don't you just want to give them a punch in the junk when they treat you like your an idoit.

If you plan on keeping the car My advice would be to get BMW NA involved and push for an extended power train warranty due to foreign particulate in the engine. If its a lease F**K it.

kitesurfer · 08-18-2016, 09:38 AM

Regardless....I would change the oil again in 50mi.

08-16-2016, 02:07 PM	#1
shamun160 Private 66 Rep 99 Posts Drives: GT4, 328i Wagon, XC90 Join Date: Feb 2014 Location: Pittsburgh, PA iTrader: (0)	Serpentine Belt + Overheat At the track a few weekends ago I got: "Charging System Malfunction" followed by idrive indicating Overheating and the car going into lymp mode. In the pits it was clear the serpentine belt had shredded. After having it trailered to my dealer they tracked down the root cause as a seized idler pulley. Since then they have been chasing check engine codes for the overheat and then a vacuum leak. It appears the vacuum leak was being caused by a bad crank seal which has been replaced. Today they dropped the oil pan and found parts of the belt in the oil pan, "but it did not make its way anywhere else in the engine". Any theories and what happened here? I am not sure I am comfortable with we changed your oil and filter now you are good to go. Car is stock with 15K miles on it. September 2014 build. Thanks for your input/advice.
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08-18-2016, 09:31 AM	#2
kitesurfer Banned 543 Rep 1,338 Posts Drives: Round n' Round Join Date: Sep 2012 Location: Paradise iTrader: (10) Garage List Aprilia Tuono 1100 RF [0.00]	How does belt make its way into the oil pan Wonderful how the service dept. states it did not make it to other areas in the engine.... don't you just want to give them a punch in the junk when they treat you like your an idoit. If you plan on keeping the car My advice would be to get BMW NA involved and push for an extended power train warranty due to foreign particulate in the engine. If its a lease F*K it. Last edited by kitesurfer; 08-18-2016 at 09:36 AM..*
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08-18-2016, 09:38 AM	#3
kitesurfer Banned 543 Rep 1,338 Posts Drives: Round n' Round Join Date: Sep 2012 Location: Paradise iTrader: (10) Garage List Aprilia Tuono 1100 RF [0.00]	Regardless....I would change the oil again in 50mi.
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