Replacing the AC and main drive belts on a Cummins ISX engine may seem challenging due to limited space, but with proper guidance, the process can be simplified. This guide provides step-by-step instructions for installing both belts.
Installing the AC Belt
The AC belt installation requires removing the main drive belt first. Follow these steps:
For reliability, consider using a trusted replacement such as the 5.9 Cummins serpentine belt.
| Step | Description |
|---|---|
| 1 | Ensure the main drive belt is removed to access the AC belt area. |
| 2 | Start by routing the AC belt around the back of the water pump pulley. |
| 3 | Wrap the belt around the idler pulley, ensuring the back of the belt is on the pulley. |
| 4 | Route the belt around the air conditioner compressor. |
| 5 | Use a long-handled wrench with a 15mm socket to ease the belt over the final pulley. |
Before finishing, turn the belt slightly to check alignment and ensure it sits properly in the grooves of all pulleys.
Installing the Main Drive Belt
The main drive belt installation involves larger components, such as the fan and alternator. Follow these steps:
| Step | Description |
|---|---|
| 1 | Begin by routing the belt over the fan and ensuring it sits on the rear side of the fan pulley. |
| 2 | Wrap the belt around the idler pulley, ensuring the grooves are facing upwards. |
| 3 | Route the belt over the water pump and ensure it aligns correctly with the main pulley. |
| 4 | Use a long-handled wrench (½-inch square) to adjust tension and fit the belt over the alternator pulley. |
| 5 | Verify alignment of the belt on all pulleys to ensure proper operation. |
Tips and Final Adjustments
When installing either belt, ensure the grooves align correctly on all pulleys to prevent wear or misalignment. Rotate the belt slightly to confirm proper seating. For assistance with parts or expert advice, contact a trusted Cummins engine parts dealer.