2025 International LT Serpentine Belt Guide

Quick Answer

• Belt Length: 2108mm
• Rib Count: 8-rib
• OEM Belt PN: 7633345
• Aftermarket Cross-Refs:
  • Gates K080830
  • Dayco 5080830
  • Continental Elite 4080830
• Auto-Tensioner PN: 7633346
• Idler Pulley PN: 7633347

Belt Routing

Before removing the old belt, we strongly recommend taking a clear photograph of the belt's path for reference. The serpentine belt on the 2025 International LT follows this path:

1. Starts at the crankshaft pulley at the bottom.
2. Wraps around the A/C compressor.
3. Goes up and around the smooth idler pulley.
4. Travels to the alternator.
5. Comes down to the power steering pump.
6. Goes around the water pump.
7. Finally, it wraps around the auto-tensioner, which maintains the correct belt tension.

How to Replace the Serpentine Belt

To replace the belt, you'll need a serpentine belt tool or a long 3/8" breaker bar. Insert the tool into the square hole on the auto-tensioner assembly. Rotate the tensioner to release the tension on the belt, allowing you to slip it off the pulleys. When installing the new belt, use your reference photograph to follow the correct path, ensuring the ribbed side of the belt mates with all grooved pulleys.

Replacement Interval

For the 2025 International LT, the recommended serpentine belt replacement interval is every 100,000 miles or 5 years, whichever comes first. However, it's crucial to inspect the belt during regular service intervals.

Signs of a Failing Belt or Tensioner

• Squealing or Chirping Noises: This is often the first sign of a worn belt or a failing tensioner bearing.
• Visible Wear: Look for cracks, fraying, or missing ribs on the belt.
• Tensioner Pulley Misalignment: A worn tensioner may cause the pulley to wobble or sit at an angle.
• Accessory Malfunctions: A slipping belt can cause issues with the alternator, power steering, or A/C.

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