Diesel engines

Replacing the auxiliary drive belt

8steps
~48min
2/5difficulty
Done 0 of 8

REMOVAL

  • Remove:
  • the front right wheel,
  • the engine undertray.
  • Using a wrench, turn the bolt (1) of the automatic tensioner clockwise (arrow) to release the belt tension (2) (Fig.16).
  • Remove the auxiliary drive belt (2).

INSTALLATION Installation is the reverse of removal, observing the following points:

  • check that the tensioner and idler pulleys rotate freely (no play, no excessive noise, no hard spots),
  • fit the belt following its routing (Fig.17).

Remplacement de la courroie d'accessoires
Fig. 17

Auxiliary drive belt

  1. Without air conditioning
  2. With air conditioning.
  3. Crankshaft pulley
  4. Water pump pulley
  5. Idler pulleys
  6. Alternator pulley
  7. Tensioner pulley
  8. Air conditioning compressor pulley.

Remplacement de la courroie d'accessoires
Fig. 16

que la courroie soit correctement positionnée dans les gorges des différentesMake sure the belt is correctly seated in the grooves of the various pulleys.

Test yourself

A quick Mercedes-Benz B-Class quiz: every answer comes with an explanation and a link to the manual page.