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Removing and installing upper toothed belt guard — VW

Removing and installing upper toothed belt guard on VW: 28 steps, engines CKFC, CLHA, CLHB, CRBC. What to remove, in what order, and what to check after.

Removing the upper toothed belt guard on these diesel engines (platform codes listed below) looks simple, but the guard is buried under the coolant expansion tank, the fuel filter and the reducing agent injector N474 on the emission control module. The fuel lines are disconnected at their plug-in connectors, the expansion tank is unclipped and laid on the engine, the fuel filter is unbolted and laid aside with lines connected, and the injector is removed with its coolant hoses still attached. The coolant lines are unclipped from the guard, and a metal line is bent carefully out of the way using a Torx screwdriver as a lever before the guard catches are released. Getting that line back to roughly 2.3 cm from the guard and bleeding the fuel system are what finish the job properly.

28 steps 27 engine codes engine codes merged from 7 documented variants

🧭 Before you start

Remove the engine cover, disconnect the fuel lines, lay the expansion tank and fuel filter on the engine, and move injector N474 aside with lines connected. Unclip the coolant lines, open the hose clip, bend the metal line upward and release the guard catches. Refit, bend the line back down to the specified clearance, seat all lines in their retainers and bleed the fuel system.

Fits: VW Passat B8 (3G, 2014–)

Don't miss

  • Leave the coolant hoses on the reducing agent injector; it is laid aside, not disconnected.
  • Bend the line only with a Torx screwdriver inserted, and gently.
  • Dimension between line and guard must be approx. 2.3 cm after refitting.
  • Left retainer must sit on its guide, and all lines must be seated in their retainers.
  • Bleed the fuel system before starting the engine.

Written for this job from the workshop steps below · TorqFix editorial.

🔧 Engine codes this applies to

CKFCCLHACLHBCRBCCRKACRKBCRLBCRMBCRNBCRUACRVACUAACUNACUSACUSBCUTACUUACUUBCUWACUXACVCACXXACXXBCYZACYZBDBKADFEA

📋 Procedure

  1. Observe safety instructions .
  2. Observe rules for cleanliness .
  3. Remove engine cover panel .
  4. Open plug-in connectors (A) and (B) of fuel lines and pull fuel lines off. Separate plug-in connectors 20plug-in connectors; Separating plug-in connectors.
  5. Release and pull off connector (2) on coolant expansion tank.
CKFC? Steps differ between engine variants — check this job against your exact car before you commit to it. Check my car — free →
  1. Unclip, release and pull off connector (4).
  2. Lay wire to one side.
  3. Unclip retainer for fuel lines on coolant expansion tank (arrow).
  4. Using a screwdriver, release catches (6).
  5. Place coolant expansion tank (1) on engine.
  6. Unbolt fuel filter, and place it on engine with lines connected 20Fuel filter; Removing and installing fuel filter.
  7. Remove injector for reducing agent N474 on emission control module with coolant hoses connected .
  8. Remove bolt (4).
  9. Unclip coolant lines (3) on toothed belt guard (1) from retainers (arrows).
  10. Unclip lines (2) from retainer (arrow) at top.
  11. Remove injector for reducing agent N474, and lay it to one side with lines connected.
  12. Open hose clip (arrow A).
  13. Pull hose off emission control module.
  14. Push Torx screwdriver (3) into line (1).
  15. Carefully bend line upwards in (direction of arrow).
  16. Release catches (arrows), disengage upper toothed belt guard (1) and detach.
  17. Push Torx screwdriver (3) into line (1).
  18. Carefully bend line downwards.
  19. Dimension (a) between the line and the toothed belt guard must be approx. 2.3 cm.
  20. Carefully bend down retainer (arrow). Use a plastic drift for this.
  21. Make sure the lines are properly seated in the retainers (arrows).
  22. The left retainer must be seated on guide (5).
  23. Bleeding fuel system .

Other VW 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.

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Workshop data on this page last updated 20 Sep 2026.