BMW M5 Forum and M6 Forums banner

S85 crankshaft replacement procedure

9.4K views 8 replies 5 participants last post by  old city bimmer  
#1 ·
I can't seem to find DIY instructions on E60 M5 crankshaft replacement. Everything that comes up when I search is for rod bearing replacement. But what if the crank is badly scored and needs to be replaced as well? What's the procedure? Are there any special tools needed (for removal or for alignment on installation)? Is it doable for a reasonably-skilled do-it-yourselfer?
 
#7 ·
Thanks guys. Still can't find any DIYs, but in any case, it sounds like more work than what I'd want to do in my relatively small garage with no engine hoist/stand, etc. In this particular case, I'm not sure the crank needs replacing, but I'm guessing it probably does. I haven't seen it yet. It's not my car we're talking about; it's a car I'm considering buying at a very low price.

If the bearings have failed enough to cause a noise, does that usually mean the crank is toast as well?