TorqFix

Cylinder head M166 /168 — MERCEDES-BENZ

Cylinder head M166 /168 on Mercedes-Benz: 33 steps, engines 166.940, 166.960, 166.961, 166.991. What to remove, in what order, and what to check after.

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

33 steps 4 engine codes

🔧 Engine codes this applies to

166.940166.960166.961166.991

📋 Procedure

  1. Installation is in the reverse order of removal
  2. Renew the gasket
  3. Renew the Torx screws and nuts
  4. Engine support:
  5. Align the timing marks
166.940? Steps differ between engine variants — check this job against your exact car before you commit to it. Check my car — free →
  1. Timing chain cover bolts
  2. Remove the chain tensioner
  3. Remove the camshaft gearwheel and chain
  4. Support the engine
  5. Torx screw
  6. Remove the bolts from the timing chain cover
  7. Remove the cylinder head
  8. Locating pin
  9. Chain tensioner

Other MERCEDES-BENZ 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.