TorqFix

Auxiliary belt replacement: BMW F10 Hybrid 5 B30A drive (N55B30A)

Step-by-step auxiliary belt replacement for the BMW F10 Hybrid 5 B30A drive (N55B30A): 11 steps. What to remove, in what order, and what to check after.

Workshop procedure for BMW — the exact step sequence and torque figures, straight from real workshop data.

11 steps 1 engine code

🧭 Before you start

Fits: platform codes ACTIVE, HYBRID, 5

  • Timing position: the crankshaft or camshaft is set and locked during this job
  • Special tools named: locking pin, locking tool

Don't miss

  • At removal, mark the direction of rotation; when refitting ensure the drive belt rotates in the same direction

🔧 Engine codes this applies to

N55B30A

📋 Procedure

  1. Tensioner locking pin:
  2. Remove the fan cowling
  3. Note: At removal, mark the direction of rotation; when refitting ensure the drive belt rotates in the same direction
  4. Turn the tensioner pulley clockwise until the locking pin fits
  5. Lock the tensioner
N55B30A? Steps differ between engine variants — check this job against your exact car before you commit to it. Check my car — free →
  1. Turn the tensioner pulley clockwise until the locking pin fits
  2. Lock the tensioner
  3. Remove the ancillary drive belt
  4. Refit the ancillary drive belt
  5. Remove the tensioner locking tool
  6. Refit the fan cowling

Other BMW procedures

Who makes these pages, and how

TorqFix was built by a mechanic — after a 2,700 km drive with five roadside repairs that no diagnostic tool could explain.

The figures on this page come from manufacturer workshop documentation and are shown as they are. The page is assembled automatically from that data — it is not written by an AI. The AI works in the chat, where it answers for your specific car. It writes nothing here.

Variants of the same model differ. Cross-check torque against the factory manual for your engine before final tightening.

Seen a figure that does not match your manual? Write to us — we correct it and note when. support@torqfix.com

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Workshop data on this page last updated 20 Sep 2026.