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      06-11-2020, 03:46 AM   #1
Phil325i
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Crank Hub Issue - which engines affected?

As per the title really.

Been reading about the issue with the S55 crank hub. In brief, BMW threw out the last 100 years of engine development and decided to lock the crank gear to the crankshaft with nothing more than a diamond sintered washer, and a load of torque from the crank bolt to hold the timing in place. In certain circumstances the bolt moves and no longer holds the timing accurately. As the S55 is an interference engine, the results can be catastrophic.

My question is: does anyone know if this design feature is found on other BMW engines? Looking at RealOEM it appears this may well be the case on other engine series, but I wanted to know for sure.

Cheers...
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      06-11-2020, 10:20 AM   #2
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N52 is the same.
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      06-29-2020, 05:27 PM   #3
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N53 also iirc
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      06-30-2020, 10:26 AM   #4
CTinline-six
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It seems to only be an issue for engines with higher HP, especially tuned engines.
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      06-30-2020, 11:19 AM   #5
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Quote:
Originally Posted by CTinline-six View Post
It seems to only be an issue for engines with higher HP, especially tuned engines.
Yeah I think you're right. And as well as aftermarket 'solutions' I also picked up that BMW have modified the sprockets by introducing a band of laser etching around the circumference, presumably to increase the friction between the face of the sprocket and the crankshaft.
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