Bimmer Performance Center S63 Tear Down for bent rod (Pic Heavy) - BMW M5 Forum and M6 Forums
F10 M5 Discussion 2010- Discussion about the next upcoming generation M5 based on the next generation 5-series, the F10.

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post #1 of 13 Old 21st December 2017, 05:20 PM Thread Starter
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Bimmer Performance Center S63 Tear Down for bent rod (Pic Heavy)

Hey guys here are some photos I took during a tear down of an F10 that came in. Customer brought this M5 in because of a really bad sound coming from the engine. Surprisingly a check engine light never came on or a warning message. Once we brought it into our center we could hear the noise right away. Once we looked over the car and made sure everything externally was ok we performed a compression test. During this test we found cylinder 5 to be the culprit. We pulled the drivers side cylinder head and removed piston/ rod combination from cylinder 5. Hope this sheds light on something that's rarely seen.
































































Only very minor scoring on the cylinder walls. Most impressive is that the cylinder bore has a bend about half way facing the passenger side.







The culprit... still amazing this didn't set a check engine light or any malfunction warning messages.








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post #2 of 13 Old 21st December 2017, 06:31 PM
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Great pictures! Thank you. There were no shadow codes either?

Tim

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post #3 of 13 Old 3rd January 2018, 05:56 PM
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post #4 of 13 Old 3rd January 2018, 10:06 PM Thread Starter
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Quote:
Originally Posted by technician117 View Post
Great pictures! Thank you. There were no shadow codes either?
Correct no codes in shadow memory either.

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post #5 of 13 Old 4th January 2018, 01:35 AM
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Curious what you think caused this. I have seen this precise failure in three separate S63s now.

--Peter
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post #6 of 13 Old 4th January 2018, 04:50 PM
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Curious what you think caused this. I have seen this precise failure in three separate S63s now.

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post #7 of 13 Old 4th January 2018, 06:51 PM Thread Starter
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This is the third S63 we have seen as well.

We have noticed there are a few variables that come into play during this issue. Two things we have seen in common with all three: anything over 700ftlbs and these rods will bend and tune (how the torque comes in and carries across the rpms).

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post #8 of 13 Old 15th January 2018, 07:44 PM
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I wonder how much value these cars will loose due to fear of motors going like the e60 m5. Bending the rod would suggest TQ or possibly manufacturing defect? Ive been looking on these for a while now.

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post #9 of 13 Old 18th January 2018, 05:18 PM
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Quote:
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I wonder how much value these cars will loose due to fear of motors going like the e60 m5. Bending the rod would suggest TQ or possibly manufacturing defect? Ive been looking on these for a while now.
I'm pretty confident the F10 will be the least valuable M5 thus far. Worst driving, heaviest, worst to work on, turbos... how could it not be?
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post #10 of 13 Old 18th January 2018, 05:23 PM
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I'm pretty confident the F10 will be the least valuable M5 thus far. Worst driving, heaviest, worst to work on, turbos... how could it not be?


I was with my tech yesterday and asked him for a low miler F10 M5 to buy and he recommended against it. He said turbos fail easily. So I passed.

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