Quote:
Originally Posted by bishbosh
Normally if replacing bearing shells wouldn't the crankshaft need to be reground? You wouldn't be able to do that in situ, certainly not by sanding the crank. And if removing the crank you'd have to take the engine out.
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I'm watching a really long video of somebody replacing the rod bearings on an E92 M3 and the procedure itself doesn't look too bad. The only difference is they're replacing the rod bearings on the M3 because they apparently wear out and this M3 at 70k miles did have wear on the bearings but didn't have any symptoms so this bearing replacement was carried out as a preventative maintenance whereas im looking to venture into it because I can already hear a slight knock. But what I'm not sure of is, can the very early signs (very light knock) be due to the slight clearance on worn bearings or does the knock mean some sort of distortion has to have been done to the shell/rod?
Just for anyone curious as it is a good and detailed video:
https://youtu.be/G8yZgOW-14M