Serpentine belt diagram for a 5.9 diesel with air and 9 pulleys

5.9L DIESEL
The 5.9L diesel engine accessory drive system (with a/c) consists of :

1. Generator Pulley (1)
2. Water Pump Pulley (2)
3. Idler Pulley (3)
4. Power Steering Pump Pulley (4)
5. Radiator Fan Pulley (5)
6. Crankshaft Pulley (6)
7. Automatic Tensioner (7)
8. A/C Compressor Pump Pulley (8)

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 or 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.


The 5.9L diesel engine accessory drive system (without a/c) consists of :

1. Generator Pulley (1)
2. Water Pump Pulley (2)
3. Idler Pulley (3)
4. Power Steering Pump Pulley (4)
5. Radiator Fan Pulley (5)
6. Crankshaft Pulley (6)
7. Automatic Tensioner (7)

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.