When to replace the Poly V-Belt on your MERCEDES-BENZ R-CLASS
Recommended replacement interval for the part category Serpentine belt : 30000 km
Important!
This replacement procedure can be used for:
MERCEDES-BENZ R-Class (W251, V251) R 300 4-matic (251.062), MERCEDES-BENZ R-Class (W251, V251) R 300 (251.054, 251.154), MERCEDES-BENZ R-Class (W251, V251) R 280 4-matic (251.062), MERCEDES-BENZ R-Class (W251, V251) R 500 4-matic (251.072, 251.172), MERCEDES-BENZ R-Class (W251, V251) R 350 (251.056, 251.156), MERCEDES-BENZ R-Class (W251, V251) R 280 (251.054, 251.154), MERCEDES-BENZ R-Class (W251, V251) R 350 4-matic (251.065, 251.165) View more

The steps may slightly vary depending on the car design.

This video shows the replacement procedure of a similar car part on another vehicle

All the parts you need to replace – Poly V-Belt for R-Class (W251, V251) and other MERCEDES-BENZ models
How to change Serpentine belt on Mercedes W251 R 320 CDI 3.0 4-matic (251.022, 251.122) – step-by-step instructions for straightforward car repair Serpentine belt
How to change V-Ribbed Belt Set on Mercedes W251 R 320 CDI 3.0 4-matic (251.022, 251.122) – step-by-step instructions for straightforward car repair V-Ribbed Belt Set
How to change Water Pump + V-Ribbed Belt Kit on Mercedes W251 R 320 CDI 3.0 4-matic (251.022, 251.122) – step-by-step instructions for straightforward car repair Water Pump + V-Ribbed Belt Kit
Tools
Replacement: serpentine belt – MERCEDES-BENZ R-CLASS (W251, V251). Tools you might need:
Combination spanner #16
Fender cover
Replacement: serpentine belt – MERCEDES-BENZ R-CLASS (W251, V251). AUTODOC experts recommend:
  • All work should be done with the engine stopped.
Carry out replacement in the following order:
  1. Step 1
    Open the bonnet.
    Step 2
    Use a fender protection cover to prevent damaging paintwork and plastic parts of the car.
    Step 3
    How to change Poly V-Belt on Mercedes W251 2005 - free PDF and video manuals
    Remove the engine cover.
    AUTODOC recommends:
    Replacement: serpentine belt – MERCEDES-BENZ R-CLASS (W251, V251). Do not use excessive force when removing the part as this may damage it.
  2. Step 4
    How to replace MERCEDES-BENZ R-Class (W251, V251) R 320 CDI 3.0 4-matic (251.022, 251.122) 2006 Poly V-Belt - step-by-step manuals and video guides
    Remove the air intake hoses.
  3. Step 5
    Mercedes W251 R 350 CDI 3.0 4-matic (251.023, 251.123) 2007 Poly V-Belt replacement: free workshop manuals
    Pull aside the V-ribbed belt tensioner pulley. Use a combination spanner #16.
  4. Step 6
    Changing Poly V-Belt on MERCEDES-BENZ R-Class (W251, V251) R 280 CDI 3.0 4-matic (251.020) 2008 by yourself
    Remove the V-ribbed belt.
    Replacement: serpentine belt – MERCEDES-BENZ R-CLASS (W251, V251). AUTODOC recommends:
    Check the condition of the tensioner pulley and idler pulley. Replace them if necessary.
  5. Step 7
    Return the tensioner pulley to its initial position.
    Step 8
    How to remove MERCEDES-BENZ R-CLASS R 500 4-matic (251.075, 251.175) 2009 Poly V-Belt - online easy-to-follow instructions
    Install the V-ribbed belt.
    Replacement: serpentine belt – MERCEDES-BENZ R-CLASS (W251, V251). Tip from AUTODOC:
    Make sure that the V-ribbed belt fits all pulleys snugly.
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DIY MERCEDES-BENZ R-Class (W251, V251) Poly V-Belt replacement - online guide
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