N55 swaps/interchangability

notijer

New Member
Feb 15, 2021
1
0
0
My 2012 M135i (N55B30) just seized yesterday.... suspect i spun the bearings.
Can anyone please help confirm if the N55B30 is interchangeable with the N55B30O0?

N55B30
Applications:
2011–2018 F06/F12/F13 640i[13]
2012–2013 E82/E88 135is[14]
2012–2015 F20/F21 M135i[15][16]
2012–2015 F01 740i/Li

N55B30O0
Applications:
2013–2016 F22/F23 M235i
2015–2016 F20/F21 M135i LCI
 

Bnks334

Lieutenant
Dec 1, 2016
511
335
0
New York
YES you can. I'm in the middle of swapping a '15 N55 335 AWD into my '11 335i xDrive because I spun a rod bearing. Its not that big of a deal. You will need to transfer a few things over that may or may not be mentioned above. As of the end 2/2012, the N55 switched to the Bosch Fuel Pump. Still, a N55 block is a N55 block!
PARTS requiring a SWAP:
Turbofold (lower mounting bracket)
Wiring Harness
DME
Vacuum Pump
HPFP
Fuel Rail
Valve Cover
Vibration Damper
Engine Brackets which bolt to the sub-frame motor mounts

Any chance you have a new style vacuum pump laying around? Would it be possible to just swap the back half of the vacuum pump instead of the entire thing? Would save a bunch of work for me with what I am trying to do... Looks like the front half of the vacuum pump is the same and it's the back half that mates to the HPFP that is different (hpfp mount is different and new style doesn't have the vacuum port since it's EWG).
 

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