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Rmldaytona, Certified Technician
Category: Dodge
Satisfied Customers: 1887
Experience:  ASE Certified. 12 years Automotive Experience.
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how do i change the serpentine belt on a dodge ram diesel 2003

Resolved Question:

how do you loosen the tension
Submitted: 9 years ago.
Category: Dodge
Expert:  Rmldaytona replied 9 years ago.


Drive belts on diesel engines are equipped with a spring loaded automatic belt tensioner.

This belt tensioner will be used on all belt configurations, such as with or without air conditioning.

  1. A 1/2 inch square hole is provided in the automatic belt tensioner. Attach a 1/2 inch drive-long handle ratchet to this hole.
  2. Rotate ratchet and tensioner assembly clockwise (as viewed from front) until tension has been relieved from belt.
  3. Remove belt from water pump pulley first.
  4. Remove belt from vehicle.


CAUTION: When installing the accessory drive belt, the belt must be routed correctly. If not, engine may overheat due to water pump rotating in wrong direction. Refer to (Fig. 15) for correct engine belt routing. The correct belt with correct length must be used.

  1. Position drive belt over all pulleys except water pump pulley.
  2. Attach a 1/2 inch ratchet to tensioner.
  3. Rotate ratchet and belt tensioner clockwise. Place belt over water pump pulley. Let tensioner rotate back into place. Remove ratchet. Be sure belt is properly seated on all pulleys.
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