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Yesterday I installed the new OEM N55 crankshaft and bearing shells (PN 11212163665). I began by removing all old bearings and cleaning the oil from the block. I also thoroughly cleaned old adhesive from the injection-sealant passageway. Once clean, I installed the new bearings into the block, making sure they were level with the crankshaft's parting line. Next I coated each bearing in a very thin layer of assembly lube. I don't want the crankshaft to touch the bearings metal-to-metal, but at the same time I don't want to affect the reading of the Plastigage.
Once I dropped the crankshaft into the engine block, I inserted a small plastigage onto each journal. Then I torqued all main bearing bolts down per factory service manual, 20Nm + 70 degrees using a torque wrench and torque angle gage.
Next I disassembled the engine to check the clearances. All journals ended up in-spec happily! After cleaning the plastigage residue off the crankshaft and bearings, I thoroughly lubed all running surfaces with assembly lube and re-assembled using new bolts.
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