RESEARCH PREVIEW · EVIDENCE-GATED
N43B20 engine replacement
BMW 3 Series Touring · E91 LCI · 320i · N43B20 · Manual
Released preparation steps can be completed; mapped and review-stage engine work stays locked until exact safety data, parts, tools and validation criteria clear review.
REFERENCE VISUALS
See what the hardware looks like.
Reference media is kept separate from step photography so a useful image cannot accidentally masquerade as exact procedure guidance.
ENGINE-FAMILY REFERENCEN43B20 engine-bay reference
Real N43B20 engine-family reference. This photograph is from a 2010 BMW E88, not an E91, so it must not be used as a routing, fastener-location or step-by-step reference for the E91 pilot.
FASTENERS & TIGHTENING
Check the hardware before you start
No separate verified fastener map is published for this guide. This does not mean no fasteners are involved. Follow the released steps and their cited specifications; if a required tightening or replacement rule is missing, stop and verify it.
How WrenchGuide treats fastener information
Material, reuse policy and tightening method are separate facts. Torque plus angle alone does not establish that a fastener is torque-to-yield or single-use. WrenchGuide will not invent a torque value or replacement rule.
Loading parts and tools…
Loading your workshop…
MY WORKSHOP JOURNAL
Remember how your car came apart.
Attach private notes and your own teardown photos to the exact procedure step. They stay on this device in the current local-first beta.
Confirm the vehicle configuration
Take a quick photo before disconnecting or removing something you may need to identify during reassembly.