A possible solution:
www.ecstuning.com/b-assembled...
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It’s the notorious N55 engine failure, biting another good customer in the butt unfortunately.
All it takes is a little time without oil pressure to those bearings and clank and shes locked.
It seems to always be the rod bearings toward the rear, mainly #5, this can be due to BMW’s simplification of the oil supply circuits within the engine.
Always prime the engine after any part of the oil circuit is opened, ie: Oil filter housings, the way to do this is simply disable the engine from starting up, by disabling ignition or fuel supply and cranking no less than 3 times, offer to replace the spark plugs too and while they are out it will crank fast and be easy on the rods due to having no compression to push against.
People have had luck with dropping the subframe and ghetto-fabulously chiseling the old bearing off the crankshaft, then using 400 grit and higher progressively to polish the journal back up and install a new bearing, do not temove a lot of metal! Check bearing clearance with plasiguage on reassembly
one guy even re-used his old oil pan gasket with rtv!!! I highly discourage doing this, always replace all bearings and gaskets at a minimum.
I really would recommend at minimum pulling the Engine, and then disassembly, with a thorough cleaning of the entire oil circuit.
I would also reccomend replacement of the connecting rod(s) (any showing signs of overheating or color change will be deformed)
All bottom end bearings should be replaced
Disassemble and inspect the oil pump for scoring (which will tell you it ingested metal flakes from the failed bearing and is sure to reduce its output, remember oil pressure is also used to power the vanos system)
Inspect for either machining or replacement of the crankshaft itself, because micro-cracking can begin to occur at the point where the affected journal joins the counterweight, which can eventually lead to a crankshaft failure at the least opportune time.
I would at minimum have a good machinist inspect and magnaflux it.
They may be able to cut it and you can buy oversized, or thicker bearings from BMW to save it, but the hardening will be removed from the surfaces of the crankshafts journals in the process.
Its always going to be a trade off at this point with this type of repair.
It can never be too clean when it comes to engine assembly.
Sorry if you felt like I was speaking a little bit fast in the video; However 60 seconds is difficult to pack this much information into, I finally got it done on about take 25.
For this reason I recommend watching it at least 45 times, 😜 for proper absorbtion to occur, thanks good patrons of KZfaq!
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