@@Bmw_doc_pl Hi, these S63 cranks are thru hardened, this visually evident by the burnet torch marks around each journal area. Because they are thru hardened, it allows for under sizing of the rod journals. This undersize is published by BMW manuals as a recommendation Thanks Ted
didnt u just remove nitric oxide layer? it provides proper crankshaft hardness which is really important for bearing-journal clearance
@@Bmw_doc_pl Hi, these S63 cranks are thru hardened, this visually evident by the burnet torch marks around each journal area. Because they are thru hardened, it allows for under sizing of the rod journals. This undersize is published by BMW manuals as a recommendation
Thanks Ted