Sprinter 2005-2007

Accessory Drive Belts

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Adjustment



Periodic drive belt tensioning is not necessary, because an automatic spring-loaded tensioner is used with these belts to maintain proper adjustment at all times.

Drive Belt Routings





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Fig. Accessory Belt Routing-A/C Compressor (1), Power Steering Pump (2), Tensioner (3), Crankshaft Pulley (4), Water Pump (5), Alternator (6), Idler Pulley (7)-All Engines



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Fig. Fan belt routing-Fan pulley (1), Fan belt (2), Crankshaft pulley (3)-3.0L engine shown

Inspection



Although many manufacturers recommend that the drive belt(s) be inspected every 30,000 miles (48,000 km) or more, it is really a good idea to check them at least once a year, or at every major fluid change. Whichever interval you choose, the belts should be checked for wear or damage. Obviously, a damaged drive belt can cause problems should it give way while the vehicle is in operation. But, improper length belts (too short or long), as well as excessively worn belts, can also cause problems. Loose accessory drive belts can lead to poor engine cooling and diminished output from the alternator, air conditioning compressor or power steering pump. A belt that is too tight places a severe strain on the driven unit and can wear out bearings quickly.

Serpentine drive belts should be inspected for rib chunking (pieces of the ribs breaking off), severe glazing, frayed cords or other visible damage. Any belt which is missing sections of 2 or more adjacent ribs which are 1 / 2 in. (13mm) or longer must be replaced. You might want to note that serpentine belts do tend to form small cracks across the backing. If the only wear you find is in the form of one or more cracks are across the backing and NOT parallel to the ribs, the belt is still good and does not need to be replaced.

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Fig. Inspect the wear patterns for the serpentine drive belt.

Removal & Installation



2.7L Engine
  1. Loosen the tension adjust and remove the A/C compressor drive belt.
  2.  
  3. Attach a 3 / 8 inch drive ratchet to the automatic belt tensioner.
  4.  
  5. Rotate the belt tensioner counterclockwise to release the belt tension.
  6.  
  7. Remove the accessory drive belt, starting with the water pump pulley.
  8.  

To install:

  1. Position the accessory drive belt around every pulley except the water pump pulley.
  2.  
  3. Rotate the drive belt tensioner clockwise, install the accessory drive belt and release the tensioner.
  4.  
  5. Position the A/C Compressor drive belt over the crankshaft pulley and A/C compressor pulley.
  6.  
  7. Tighten the drive belt tensioner.
  8.  
  9. Ensure the belt is seated properly on all of the pulleys.
  10.  

3.0L OHV & DOHC Engines
  1. Remove the radiator fan. For additional information, refer to the following section, "Engine Fan, Removal & Installation.-
  2.  
  3. Rotate the crankshaft pulley clockwise and walk the fan drive belt off of the crankshaft pulley.
  4.  
  5. Rotate the accessory drive belt tensioner counterclockwise to release the belt tension.
  6.  
  7. Remove the accessory drive belt.
  8.  

To install:

  1. Position the accessory drive belt around every pulley except the water pump pulley.
  2.  
  3. Rotate the drive belt tensioner clockwise, install the accessory drive belt and release the tensioner.
  4.  
  5. Position fan drive belt on water pump pulley.
  6.  
  7. Position fan drive belt on crankshaft pulley.
    NOTE
    Use only wire ties with nylon locks, not metal.

  8.  
  9. Working from the back side of the crankshaft pulley, insert a nylon wire tie through one of the holes in the pulley.
  10.  
  11. Use a nylon wire tie to hold fan drive belt in place.
  12.  
  13. Tighten the wire tie to hold the drive belt in position.
  14.  
  15. Slowly rotate crankshaft pulley clockwise
  16.  
  17. Make sure fan drive belt is fully seated.
  18.  
  19. Install the radiator fan.
  20.  

3.5L Engine
  1. Remove the radiator fan. For additional information, refer to the following section, "Engine Fan, Removal & Installation.-
  2.  
  3. Rotate the accessory drive belt tensioner counterclockwise to release the belt tension.
  4.  
  5. Remove the accessory drive belt.
  6.  

To install:

  1. Position the accessory drive belt around every pulley except one.
  2.  
  3. Rotate the drive belt tensioner clockwise, install the accessory drive belt and release the tensioner.
  4.  
  5. Install the radiator fan.
  6.  

 
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