W204 diesel 716.6 gearbox — MERCEDES-BENZ
W204 diesel 716.6 gearbox on Mercedes-Benz: 51 steps, engines 646.811, 646.812, 651.911, 651.913. 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.
🧭 Before you start
Fits: platform codes 180, CDI, BLUEEFF, -T, |, 200, 220, -COUPE
- Opens: brake fluid, clutch fluid
Don't miss
- Mark the propeller shaft position
📐 9 workshop diagrams for 646.811
Real factory drawings for this job — timing marks, bolt locations and routing. Locked in the free view.
📋 Procedure
Preparation and removal
- Disconnect the battery earth cable
- Check the gearbox fluid level
- Top up if necessary
- Disconnect the oxygen sensor(s)
- Remove the front exhaust pipe together with the diesel particulate filter
- Remove the diesel particulate filter bracket
- Remove the engine covers
- Remove the clutch housing screen
- Gearbox earth cable:
- Disconnect the earth cable from the gearbox
- Disconnect the reversing light switch
- Cross member/body:
- Oxygen sensor
- Disconnect the lines from the clutch slave cylinder
- Drain the hydraulic clutch
- Note: Plug the ends of the hydraulic lines
- Support the gearbox
- Remove the rear cross member
- Mark the propeller shaft position
- Disconnect the propeller shaft from the gearbox
- Renew the self-locking nuts
- Disconnect the gear-shift rod from the gearbox
- Support the engine
- Remove the engine to gearbox bolts
- Lower the gearbox slightly
- Remove the gearbox
Installation and checks
- - Bleeding the hydraulic circuit
- Remove the brake fluid reservoir cap
- Connect the brake fluid replacement unit
- Open the bleed screw
- Pump the clutch pedal repeatedly
- Until no bubbles come out
- Close the bleed screw
- Release the clutch pedal
- Tighten the bleed screw(s)
- Lower the vehicle
- Switch off the brake fluid replacement unit
- Disconnect the brake fluid replacement unit
- Reconnect the clutch hydraulic line
Ask TorqFix about your Mercedes-Benz 646.811 — it answers with the exact sequence for that engine and the workshop drawing for each step. First question is free after a 20-second sign-up, no card.
Ask about your Mercedes-Benz 646.811 — free → or sign up free to see the drawingsOther MERCEDES-BENZ procedures
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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
The story behind TorqFix →Workshop data on this page last updated 20 Sep 2026.